ShvIA

LEB Security

AI Benchmark · LEB · next series · proposed

This is one of the two tracks of the next series. The other is LEB Default.

One of the two tracks of the next LEB series: finding and fixing vulnerabilities in a system that works, without breaking it. The task is defensive: the agent gets the system and its contract, and the attack checks belong to the evaluator and do not travel in the package. How LEB works today, and how its levels differ, is on the Benchmark page.

Read the design LEB Default

The cases so far

Each configuration is run on system A, 90 minutes at most per run. While an instance is active only its aggregate is published: no per-flaw result, no verdict, no delivery.

Claude Opus 5.5

Anthropiceffort max

LEB-S-300-A v1.0 · Security track · 5 runs

Estimate 995 of 1000 LEB Platinum 95% interval · 995 – 996
  • Security850/850
  • Compatibility100/100
  • Explanation45/50
Score of each run
  1. 995
  2. 995
  3. 995
  4. 995
  5. 996

Per run, on average: US$ 15.59 and 54 minutes.

Comment and details

Five runs between 995 and 996, mean 995 with a 95% interval of 995 to 996, all Platinum. All five completed inside the 90-minute budget, at about US$ 15.59 and 54 minutes each, and none broke a behavior the public tests protect (compatibility 100 in every run). Security averaged 850 of 850: the reports covered all 24 planted vulnerabilities in every run and the code fixed all of them in every run. No decoy was reported as a vulnerability; extra findings: 2, 4, 3, 1 and 4. The lists follow the order of the runs. The reports were rated 45 to 46 of 50. It is one system, so the interval only reflects the variation among the runs on it: how the configuration does across systems is not measured yet. One attempt was lost to the lab or the operator and rerun. Four blind judges read each delivery (two for the planted items, two for the report) and a person settles any disagreement between the first two. Some runs used an Anthropic API key, some the owner's Claude subscription (a long-lived token), where the client's cost is the list price; same model and client.

  • 5 of 5 scheduled attempts completed with the requested model. Systems on which every attempt completed: 1 of 1.
  • Expected score per scheduled attempt: 995.2 (995.0 to 995.6).
  • Blocked: 0 (at the start 0, during the work 0). Budget exhausted: 0. Switched: 0. Lost to the lab or the operator, rerun: 1.

Answer key (matrix) SHA-256 a563e8b4cdcf03c84e7f64f8e2e5d02879406383e0bc55e61f55e38ae422ed8a · package SHA-256 566bb6798e1a0f76bef0ba7ec7ad166de82debebf44ec720249a62131ae8b45c.

DeepSeek V4.1 Flash

DeepSeekeffort maxpermissions auto-approved

LEB-S-300-A v1.0 · Security track · 1 run

Estimate 992 of 1000 LEB Platinum 95% interval · 992 – 992
  • Security850/850
  • Compatibility100/100
  • Explanation42/50
Score of each run
  1. 992

Per run, on average: US$ 0.10 and 30 minutes.

Comment and details

One run of a case of five, scored 992, Platinum. It completed inside the 90-minute budget, at about US$ 0.10 (the client's own estimate) and 30 minutes, and it broke no behavior the public tests protect (compatibility 100). Security scored 850 of 850: the report covered all 24 planted vulnerabilities and the code fixed all of them. No decoy was reported as a vulnerability; no extra findings. The report was rated 42 of 50. It is one system, so the interval only reflects the variation among the runs on it: how the configuration does across systems is not measured yet. Four blind judges read each delivery (two for the planted items, two for the report) and a person settles any disagreement between the first two. It ran with the client's auto-approval flag, an exception to the series' rule against bypassing approvals (see the notes).

  • 1 of 1 scheduled attempt completed with the requested model. Systems on which every attempt completed: 1 of 1.
  • Expected score per scheduled attempt: 992.0 (992.0 to 992.0).
  • Blocked: 0 (at the start 0, during the work 0). Budget exhausted: 0. Switched: 0. Lost to the lab or the operator, rerun: 0.

Answer key (matrix) SHA-256 a563e8b4cdcf03c84e7f64f8e2e5d02879406383e0bc55e61f55e38ae422ed8a · package SHA-256 566bb6798e1a0f76bef0ba7ec7ad166de82debebf44ec720249a62131ae8b45c.

Claude Opus 5.5

Anthropiceffort xhigh

LEB-S-300-A v1.0 · Security track · 5 runs

Estimate 989 of 1000 LEB Platinum 95% interval · 984 – 995
  • Security845/850
  • Compatibility100/100
  • Explanation45/50
Score of each run
  1. 995
  2. 995
  3. 995
  4. 981
  5. 981

Per run, on average: US$ 6.83 and 32 minutes.

Comment and details

Five runs between 981 and 995, mean 989 with a 95% interval of 984 to 995, all Platinum. All five completed inside the 90-minute budget, at about US$ 6.83 and 32 minutes each, and none broke a behavior the public tests protect (compatibility 100 in every run). Security averaged 845 of 850: the reports covered 24, 24, 24, 23 and 23 of the 24 planted vulnerabilities and the code fixed all of them in every run. No decoy was reported as a vulnerability; extra findings: 8, 2, 4, 0 and 2. The lists follow the order of the runs. The reports were rated 44 to 45 of 50. It is one system, so the interval only reflects the variation among the runs on it: how the configuration does across systems is not measured yet. Four blind judges read each delivery (two for the planted items, two for the report) and a person settles any disagreement between the first two. Every run ran on an Anthropic API key, billed to API credit.

  • 5 of 5 scheduled attempts completed with the requested model. Systems on which every attempt completed: 1 of 1.
  • Expected score per scheduled attempt: 989.4 (983.8 to 995.0).
  • Blocked: 0 (at the start 0, during the work 0). Budget exhausted: 0. Switched: 0. Lost to the lab or the operator, rerun: 0.

Answer key (matrix) SHA-256 a563e8b4cdcf03c84e7f64f8e2e5d02879406383e0bc55e61f55e38ae422ed8a · package SHA-256 566bb6798e1a0f76bef0ba7ec7ad166de82debebf44ec720249a62131ae8b45c.

Claude Sonnet 5.5

Anthropiceffort xhigh

LEB-S-300-A v1.0 · Security track · 5 runs

Estimate 988 of 1000 LEB Platinum 95% interval · 976 – 995
  • Security844/850
  • Compatibility100/100
  • Explanation44/50
Score of each run
  1. 964
  2. 995
  3. 995
  4. 995
  5. 992

Per run, on average: US$ 4.71 and 30 minutes.

Comment and details

Five runs between 964 and 995, mean 988 with a 95% interval of 976 to 995, all Platinum. All five completed inside the 90-minute budget, at about US$ 4.71 and 30 minutes each, and none broke a behavior the public tests protect (compatibility 100 in every run). Security averaged 844 of 850: the reports covered 22, 24, 24, 24 and 24 of the 24 planted vulnerabilities and the code fixed all of them in every run. No decoy was reported as a vulnerability; extra findings: 0, 2, 2, 5 and 8. The lists follow the order of the runs. The reports were rated 42 to 45 of 50. It is one system, so the interval only reflects the variation among the runs on it: how the configuration does across systems is not measured yet. Four blind judges read each delivery (two for the planted items, two for the report) and a person settles any disagreement between the first two. Every run ran on an Anthropic API key, billed to API credit.

  • 5 of 5 scheduled attempts completed with the requested model. Systems on which every attempt completed: 1 of 1.
  • Expected score per scheduled attempt: 988.2 (975.8 to 995.0).
  • Blocked: 0 (at the start 0, during the work 0). Budget exhausted: 0. Switched: 0. Lost to the lab or the operator, rerun: 0.

Answer key (matrix) SHA-256 a563e8b4cdcf03c84e7f64f8e2e5d02879406383e0bc55e61f55e38ae422ed8a · package SHA-256 566bb6798e1a0f76bef0ba7ec7ad166de82debebf44ec720249a62131ae8b45c.

DeepSeek V4.1 Flash 1017

DeepSeekeffort maxpermissions auto-approved

LEB-S-300-A v1.0 · Security track · 5 runs

Estimate 986 of 1000 LEB Platinum 95% interval · 973 – 992
  • Security844/850
  • Compatibility100/100
  • Explanation42/50
Score of each run
  1. 991
  2. 993
  3. 992
  4. 992
  5. 961

Per run, on average: US$ 0.12 and 39 minutes.

Comment and details

Five runs between 961 and 993, mean 986 with a 95% interval of 973 to 992, all Platinum. All five completed inside the 90-minute budget, at about US$ 0.12 (the client's own estimate) and 39 minutes each, and none broke a behavior the public tests protect (compatibility 100 in every run). Security averaged 844 of 850: the reports covered 24, 24, 24, 24 and 22 of the 24 planted vulnerabilities and the code fixed all of them in every run. No decoy was reported as a vulnerability; no extra findings. The lists follow the order of the runs. The reports were rated 41 to 43 of 50. It is one system, so the interval only reflects the variation among the runs on it: how the configuration does across systems is not measured yet. Four blind judges read each delivery (two for the planted items, two for the report) and a person settles any disagreement between the first two. It ran with the client's auto-approval flag, an exception to the series' rule against bypassing approvals (see the notes). DeepSeek's API reports only the alias deepseek-flash: the 1017 build is what the lab was told it pointed to.

  • 5 of 5 scheduled attempts completed with the requested model. Systems on which every attempt completed: 1 of 1.
  • Expected score per scheduled attempt: 985.8 (973.4 to 992.4).
  • Blocked: 0 (at the start 0, during the work 0). Budget exhausted: 0. Switched: 0. Lost to the lab or the operator, rerun: 0.

Answer key (matrix) SHA-256 a563e8b4cdcf03c84e7f64f8e2e5d02879406383e0bc55e61f55e38ae422ed8a · package SHA-256 566bb6798e1a0f76bef0ba7ec7ad166de82debebf44ec720249a62131ae8b45c.

Claude Opus 5.5

Anthropiceffort high

LEB-S-300-A v1.0 · Security track · 5 runs

Estimate 984 of 1000 LEB Platinum 95% interval · 972 – 994
  • Security841/850
  • Compatibility100/100
  • Explanation43/50
Score of each run
  1. 994
  2. 977
  3. 963
  4. 992
  5. 994

Per run, on average: US$ 3.78 and 19 minutes.

Comment and details

Five runs between 963 and 994, mean 984 with a 95% interval of 972 to 994, all Platinum. All five completed inside the 90-minute budget, at about US$ 3.78 and 19 minutes each, and none broke a behavior the public tests protect (compatibility 100 in every run). Security averaged 841 of 850: the reports covered 24, 23, 22, 24 and 24 of the 24 planted vulnerabilities and the code fixed all of them in every run. No decoy was reported as a vulnerability; extra findings: 0, 0, 2, 2 and 4. The lists follow the order of the runs. The reports were rated 42 to 44 of 50. It is one system, so the interval only reflects the variation among the runs on it: how the configuration does across systems is not measured yet. Four blind judges read each delivery (two for the planted items, two for the report) and a person settles any disagreement between the first two. Every run ran on an Anthropic API key, billed to API credit.

  • 5 of 5 scheduled attempts completed with the requested model. Systems on which every attempt completed: 1 of 1.
  • Expected score per scheduled attempt: 984.0 (972.0 to 993.6).
  • Blocked: 0 (at the start 0, during the work 0). Budget exhausted: 0. Switched: 0. Lost to the lab or the operator, rerun: 0.

Answer key (matrix) SHA-256 a563e8b4cdcf03c84e7f64f8e2e5d02879406383e0bc55e61f55e38ae422ed8a · package SHA-256 566bb6798e1a0f76bef0ba7ec7ad166de82debebf44ec720249a62131ae8b45c.

MiMo V2.6 Pro

Xiaomieffort highpermissions auto-approved

LEB-S-300-A v1.0 · Security track · 1 run

Estimate 969 of 1000 LEB Platinum 95% interval · 969 – 969
  • Security824/850
  • Compatibility100/100
  • Explanation45/50
Score of each run
  1. 969

Per run, on average: US$ 0.18 and 66 minutes.

Comment and details

One run of a case of five, scored 969, Platinum. It completed inside the 90-minute budget, at about US$ 0.18 (the client's own estimate) and 66 minutes, and it broke no behavior the public tests protect (compatibility 100). Security scored 824 of 850: the report covered 23 of the 24 planted vulnerabilities and the code fixed 23 of them. No decoy was reported as a vulnerability; extra findings: 2. The report was rated 45 of 50. It is one system, so the interval only reflects the variation among the runs on it: how the configuration does across systems is not measured yet. Four blind judges read each delivery (two for the planted items, two for the report) and a person settles any disagreement between the first two. It ran with the client's auto-approval flag, an exception to the series' rule against bypassing approvals (see the notes). It was reached through OpenRouter, pinned to Xiaomi's own endpoint (fp8 quantization), because the router otherwise spreads the model over other hosts; the client defines the efforts low, medium and high for it, so high is the most it could ask for.

  • 1 of 1 scheduled attempt completed with the requested model. Systems on which every attempt completed: 1 of 1.
  • Expected score per scheduled attempt: 969.0 (969.0 to 969.0).
  • Blocked: 0 (at the start 0, during the work 0). Budget exhausted: 0. Switched: 0. Lost to the lab or the operator, rerun: 0.

Answer key (matrix) SHA-256 a563e8b4cdcf03c84e7f64f8e2e5d02879406383e0bc55e61f55e38ae422ed8a · package SHA-256 566bb6798e1a0f76bef0ba7ec7ad166de82debebf44ec720249a62131ae8b45c.

Claude Fable 5.2

Anthropiceffort xhigh

LEB-S-300-A v1.0 · Security track · 1 run

Estimate 968 of 1000 LEB Platinum 95% interval · 968 – 968
  • Security824/850
  • Compatibility100/100
  • Explanation44/50
Score of each run
  1. 968

Per run, on average: US$ 26.32 and 80 minutes.

Comment and details

One run of a case of five, scored 968, Platinum. It completed inside the 90-minute budget, at about US$ 26.32 and 80 minutes, and it broke no behavior the public tests protect (compatibility 100). Security scored 824 of 850: the report covered 22 of the 24 planted vulnerabilities and the code fixed all of them. No decoy was reported as a vulnerability; extra findings: 2. The report was rated 44 of 50. It is one system, so the interval only reflects the variation among the runs on it: how the configuration does across systems is not measured yet. Four blind judges read each delivery (two for the planted items, two for the report) and a person settles any disagreement between the first two. It ran on the owner's Claude subscription through a long-lived token, where the client's cost is the list price, not a charge.

  • 1 of 1 scheduled attempt completed with the requested model. Systems on which every attempt completed: 1 of 1.
  • Expected score per scheduled attempt: 968.0 (968.0 to 968.0).
  • Blocked: 0 (at the start 0, during the work 0). Budget exhausted: 0. Switched: 0. Lost to the lab or the operator, rerun: 0.

Answer key (matrix) SHA-256 a563e8b4cdcf03c84e7f64f8e2e5d02879406383e0bc55e61f55e38ae422ed8a · package SHA-256 566bb6798e1a0f76bef0ba7ec7ad166de82debebf44ec720249a62131ae8b45c.

GPT-6-astra

OpenAIeffort xhighpermissions bypassed

LEB-S-300-A v1.0 · Security track · 5 runs

Estimate 968 of 1000 LEB Platinum 95% interval · 961 – 973
  • Security824/850
  • Compatibility100/100
  • Explanation43/50
Score of each run
  1. 967
  2. 972
  3. 968
  4. 976
  5. 956

Tokens: 159,545 in · 41,860 out · 4,354,732 cache · 4,556,137 total20 min per run, on average

Comment and details

Five runs between 956 and 976, mean 968 with a 95% interval of 961 to 973, all Platinum. All five completed inside the 90-minute budget, about 4.6 million tokens and 20 minutes each (the log keeps no cost), and none broke a behavior the public tests protect (compatibility 100 in every run). Security averaged 824 of 850: the reports covered 22, 22, 22, 23 and 21 of the 24 planted vulnerabilities and the code fixed all of them in every run. No decoy was reported as a vulnerability; extra findings: 3, 0, 1, 0 and 2. The lists follow the order of the runs. The reports were rated 43 to 44 of 50. It is one system, so the interval only reflects the variation among the runs on it: how the configuration does across systems is not measured yet. Four blind judges read each delivery (two for the planted items, two for the report) and a person settles any disagreement between the first two. It ran with the client's approvals and sandbox bypassed, an exception to the series' rule against it (see the notes). Some runs ran on an API key and some on the client's stored login; the model and the client are the same.

  • 5 of 5 scheduled attempts completed with the requested model. Systems on which every attempt completed: 1 of 1.
  • Expected score per scheduled attempt: 967.8 (961.4 to 973.4).
  • Blocked: 0 (at the start 0, during the work 0). Budget exhausted: 0. Switched: 0. Lost to the lab or the operator, rerun: 0.

Answer key (matrix) SHA-256 a563e8b4cdcf03c84e7f64f8e2e5d02879406383e0bc55e61f55e38ae422ed8a · package SHA-256 566bb6798e1a0f76bef0ba7ec7ad166de82debebf44ec720249a62131ae8b45c.

MiMo V2.6 Pro UltraSpeed

Xiaomieffort highpermissions auto-approved

LEB-S-300-A v1.0 · Security track · 1 run

Estimate 966 of 1000 LEB Platinum 95% interval · 966 – 966
  • Security824/850
  • Compatibility100/100
  • Explanation42/50
Score of each run
  1. 966

Per run, on average: US$ 1.85 and 41 minutes.

Comment and details

One run of a case of five, scored 966, Platinum. It completed inside the 90-minute budget, at about US$ 1.85 (the client's own estimate) and 41 minutes, and it broke no behavior the public tests protect (compatibility 100). Security scored 824 of 850: the report covered 23 of the 24 planted vulnerabilities and the code fixed 23 of them. No decoy was reported as a vulnerability; no extra findings. The report was rated 42 of 50. It is one system, so the interval only reflects the variation among the runs on it: how the configuration does across systems is not measured yet. Four blind judges read each delivery (two for the planted items, two for the report) and a person settles any disagreement between the first two. It ran with the client's auto-approval flag, an exception to the series' rule against bypassing approvals (see the notes). It was reached through OpenRouter, pinned to Xiaomi's own endpoint (fp8 quantization), the only upstream of this model; the client defines the efforts low, medium and high for it, so high is the most it could ask for.

  • 1 of 1 scheduled attempt completed with the requested model. Systems on which every attempt completed: 1 of 1.
  • Expected score per scheduled attempt: 966.0 (966.0 to 966.0).
  • Blocked: 0 (at the start 0, during the work 0). Budget exhausted: 0. Switched: 0. Lost to the lab or the operator, rerun: 0.

Answer key (matrix) SHA-256 a563e8b4cdcf03c84e7f64f8e2e5d02879406383e0bc55e61f55e38ae422ed8a · package SHA-256 566bb6798e1a0f76bef0ba7ec7ad166de82debebf44ec720249a62131ae8b45c.

GPT-6.1-terra

OpenAIeffort xhighpermissions bypassed

LEB-S-300-A v1.0 · Security track · 1 run

Estimate 962 of 1000 LEB Platinum 95% interval · 962 – 962
  • Security820/850
  • Compatibility100/100
  • Explanation42/50
Score of each run
  1. 962

Tokens: 166,879 in · 56,203 out · 10,319,292 cache · 10,542,374 total22 min per run, on average

Comment and details

One run of a case of five, scored 962, Platinum. It completed inside the 90-minute budget, about 10.5 million tokens and 22 minutes (the log keeps no cost), and it broke no behavior the public tests protect (compatibility 100). Security scored 820 of 850: the report covered 22 of the 24 planted vulnerabilities and the code fixed all of them. No decoy was reported as a vulnerability; extra findings: 4. The report was rated 42 of 50. It is one system, so the interval only reflects the variation among the runs on it: how the configuration does across systems is not measured yet. Four blind judges read each delivery (two for the planted items, two for the report) and a person settles any disagreement between the first two. It ran with the client's approvals and sandbox bypassed, an exception to the series' rule against it (see the notes).

  • 1 of 1 scheduled attempt completed with the requested model. Systems on which every attempt completed: 1 of 1.
  • Expected score per scheduled attempt: 962.0 (962.0 to 962.0).
  • Blocked: 0 (at the start 0, during the work 0). Budget exhausted: 0. Switched: 0. Lost to the lab or the operator, rerun: 0.

Answer key (matrix) SHA-256 a563e8b4cdcf03c84e7f64f8e2e5d02879406383e0bc55e61f55e38ae422ed8a · package SHA-256 566bb6798e1a0f76bef0ba7ec7ad166de82debebf44ec720249a62131ae8b45c.

DeepSeek V4.1 Flash

DeepSeekeffort highpermissions auto-approved

LEB-S-300-A v1.0 · Security track · 1 run

Estimate 959 of 1000 LEB Platinum 95% interval · 959 – 959
  • Security816/850
  • Compatibility100/100
  • Explanation43/50
Score of each run
  1. 959

Per run, on average: US$ 0.08 and 34 minutes.

Comment and details

One run of a case of five, scored 959, Platinum. It completed inside the 90-minute budget, at about US$ 0.08 (the client's own estimate) and 34 minutes, and it broke no behavior the public tests protect (compatibility 100). Security scored 816 of 850: the report covered 23 of the 24 planted vulnerabilities and the code fixed 23 of them. No decoy was reported as a vulnerability; no extra findings. The report was rated 43 of 50. It is one system, so the interval only reflects the variation among the runs on it: how the configuration does across systems is not measured yet. Four blind judges read each delivery (two for the planted items, two for the report) and a person settles any disagreement between the first two. It ran with the client's auto-approval flag, an exception to the series' rule against bypassing approvals (see the notes).

  • 1 of 1 scheduled attempt completed with the requested model. Systems on which every attempt completed: 1 of 1.
  • Expected score per scheduled attempt: 959.0 (959.0 to 959.0).
  • Blocked: 0 (at the start 0, during the work 0). Budget exhausted: 0. Switched: 0. Lost to the lab or the operator, rerun: 0.

Answer key (matrix) SHA-256 a563e8b4cdcf03c84e7f64f8e2e5d02879406383e0bc55e61f55e38ae422ed8a · package SHA-256 566bb6798e1a0f76bef0ba7ec7ad166de82debebf44ec720249a62131ae8b45c.

MiniMax-M3

MiniMaxeffort thinkingpermissions auto-approved

LEB-S-300-A v1.0 · Security track · 5 runs

Estimate 958 of 1000 LEB Platinum 95% interval · 934 – 983
  • Security816/850
  • Compatibility100/100
  • Explanation42/50
Score of each run
  1. 991
  2. 994
  3. 925
  4. 939
  5. 943

Per run, on average: US$ 1.37 and 56 minutes.

Comment and details

Five runs between 925 and 994, mean 958 with a 95% interval of 934 to 983, all Platinum. All five completed inside the 90-minute budget, at about US$ 1.37 (the client's own estimate) and 56 minutes each, and none broke a behavior the public tests protect (compatibility 100 in every run). Security averaged 816 of 850: the reports covered 24, 24, 21, 21 and 23 of the 24 planted vulnerabilities and the code fixed 24, 24, 22, 23 and 22 of them. No decoy was reported as a vulnerability; extra findings: 0, 8, 4, 2 and 3. The lists follow the order of the runs. The reports were rated 40 to 44 of 50. It is one system, so the interval only reflects the variation among the runs on it: how the configuration does across systems is not measured yet. Four blind judges read each delivery (two for the planted items, two for the report) and a person settles any disagreement between the first two. It ran with the client's auto-approval flag, an exception to the series' rule against bypassing approvals (see the notes). It was reached through MiniMax's own API; the client defines only the efforts none and thinking for it, so thinking is the most it could ask for.

  • 5 of 5 scheduled attempts completed with the requested model. Systems on which every attempt completed: 1 of 1.
  • Expected score per scheduled attempt: 958.4 (934.2 to 983.0).
  • Blocked: 0 (at the start 0, during the work 0). Budget exhausted: 0. Switched: 0. Lost to the lab or the operator, rerun: 0.

Answer key (matrix) SHA-256 a563e8b4cdcf03c84e7f64f8e2e5d02879406383e0bc55e61f55e38ae422ed8a · package SHA-256 566bb6798e1a0f76bef0ba7ec7ad166de82debebf44ec720249a62131ae8b45c.

GPT-6.1-sol

OpenAIeffort xhighpermissions bypassed

LEB-S-300-A v1.0 · Security track · 5 runs

Estimate 954 of 1000 LEB Platinum 95% interval · 947 – 960
  • Security811/850
  • Compatibility100/100
  • Explanation43/50
Score of each run
  1. 944
  2. 954
  3. 962
  4. 956
  5. 956

Tokens: 172,496 in · 50,143 out · 5,364,791 cache · 5,587,430 total19 min per run, on average

Comment and details

Five runs between 944 and 962, mean 954 with a 95% interval of 947 to 960, all Platinum. 4 of 5 completed inside the budget, about 5.6 million tokens and 19 minutes each (the log keeps no cost), and none broke what the public tests protect (compatibility 100 in every run). Security averaged 811 of 850: the reports covered 20, 21, 22, 21 and 21 of the 24 planted vulnerabilities and the code fixed all of them in every run. No decoy was reported as a vulnerability; extra findings: 2, 2, 2, 0 and 1. The lists follow the order of the runs. The reports were rated 42 to 45 of 50. It is one system: the interval reflects only the variation among its runs, and how it does across systems is not measured yet. One attempt was lost (lab or operator) and rerun. One scheduled attempt was blocked by the model's own safeguards during the work; it counts in the expected score, not in the estimate. Four blind judges read each delivery (two for the planted items, two for the report); a person settles disagreements between the first two. It ran with approvals and sandbox bypassed, the series' exception (see the notes). Some runs used an API key, some the stored login (same model and client).

  • 4 of 5 scheduled attempts completed with the requested model. Systems on which every attempt completed: 0 of 1.
  • Expected score per scheduled attempt: 954.4 (948.8 to 959.2).
  • Blocked: 1 (at the start 0, during the work 1). Budget exhausted: 0. Switched: 0. Lost to the lab or the operator, rerun: 1.

Answer key (matrix) SHA-256 a563e8b4cdcf03c84e7f64f8e2e5d02879406383e0bc55e61f55e38ae422ed8a · package SHA-256 566bb6798e1a0f76bef0ba7ec7ad166de82debebf44ec720249a62131ae8b45c.

Kimi K3.1 Pro

Moonshot AIeffort maxpermissions auto-approved

LEB-S-300-A v1.0 · Security track · 1 run

Estimate 954 of 1000 LEB Platinum 95% interval · 954 – 954
  • Security812/850
  • Compatibility100/100
  • Explanation42/50
Score of each run
  1. 954

Per run, on average: US$ 1.35 and 25 minutes.

Comment and details

One run of a case of five, scored 954, Platinum. It completed inside the 90-minute budget, at about US$ 1.35 (the client's own estimate) and 25 minutes, and it broke no behavior the public tests protect (compatibility 100). Security scored 812 of 850: the report covered 21 of the 24 planted vulnerabilities and the code fixed all of them. No decoy was reported as a vulnerability; no extra findings. The report was rated 42 of 50. It is one system, so the interval only reflects the variation among the runs on it: how the configuration does across systems is not measured yet. Four blind judges read each delivery (two for the planted items, two for the report) and a person settles any disagreement between the first two. It ran with the client's auto-approval flag, an exception to the series' rule against bypassing approvals (see the notes). It ran through the Kimi Code membership, where the client's cost is the list price, not a charge.

  • 1 of 1 scheduled attempt completed with the requested model. Systems on which every attempt completed: 1 of 1.
  • Expected score per scheduled attempt: 954.0 (954.0 to 954.0).
  • Blocked: 0 (at the start 0, during the work 0). Budget exhausted: 0. Switched: 0. Lost to the lab or the operator, rerun: 0.

Answer key (matrix) SHA-256 a563e8b4cdcf03c84e7f64f8e2e5d02879406383e0bc55e61f55e38ae422ed8a · package SHA-256 566bb6798e1a0f76bef0ba7ec7ad166de82debebf44ec720249a62131ae8b45c.

Crouton Alpha

Stealtheffort maxpermissions auto-approved

LEB-S-300-A v1.0 · Security track · 1 run

Estimate 945 of 1000 LEB Platinum 95% interval · 945 – 945
  • Security803/850
  • Compatibility100/100
  • Explanation42/50
Score of each run
  1. 945

Per run, on average: US$ 0.00 and 31 minutes.

Comment and details

One run of a case of five, scored 945, Platinum. It completed inside the 90-minute budget, at about US$ 0.00 (the client's own estimate) and 31 minutes, and it broke no behavior the public tests protect (compatibility 100). Security scored 803 of 850: the report covered 22 of the 24 planted vulnerabilities and the code fixed 23 of them. No decoy was reported as a vulnerability; no extra findings. The report was rated 42 of 50. It is one system: the interval reflects only the variation among its runs, and how it does across systems is not measured yet. One attempt was lost (lab or operator) and not rerun yet. Four blind judges read each delivery (two for the planted items, two for the report); a person settles disagreements between the first two. It ran with the client's auto-approval flag, an exception to the series' rule against bypassing approvals (see the notes). It was reached through OpenRouter's free variant, with no provider pinned (the endpoint that answered the lab's probe was Stealth's, a stealth model whose maker OpenRouter withholds); the client defines the efforts minimal, low, medium, high, xhigh and max for it, so max is the most it could ask for.

  • 1 of 1 scheduled attempt completed with the requested model. Systems on which every attempt completed: 1 of 1.
  • Expected score per scheduled attempt: 945.0 (945.0 to 945.0).
  • Blocked: 0 (at the start 0, during the work 0). Budget exhausted: 0. Switched: 0. Lost to the lab or the operator, rerun: 1.

Answer key (matrix) SHA-256 a563e8b4cdcf03c84e7f64f8e2e5d02879406383e0bc55e61f55e38ae422ed8a · package SHA-256 566bb6798e1a0f76bef0ba7ec7ad166de82debebf44ec720249a62131ae8b45c.

Claude Sonnet 5.5

Anthropiceffort high

LEB-S-300-A v1.0 · Security track · 5 runs

Estimate 943 of 1000 LEB Platinum 95% interval · 927 – 969
  • Security806/850
  • Compatibility94/100
  • Explanation43/50
Score of each run
  1. 924
  2. 993
  3. 927
  4. 932
  5. 937

Per run, on average: US$ 1.82 and 16 minutes.

Comment and details

Five runs between 924 and 993, mean 943 with a 95% interval of 927 to 969, all Platinum. All five completed inside the 90-minute budget, at about US$ 1.82 and 16 minutes each, and compatibility was between 70 and 100. Security averaged 806 of 850: the reports covered 21, 24, 21, 22 and 22 of the 24 planted vulnerabilities and the code fixed 23, 24, 23, 24 and 23 of them. No decoy was reported as a vulnerability; extra findings: 6, 2, 2, 0 and 2. The lists follow the order of the runs. The reports were rated 42 to 45 of 50. It is one system, so the interval only reflects the variation among the runs on it: how the configuration does across systems is not measured yet. One attempt was lost to the lab or the operator and rerun. Four blind judges read each delivery (two for the planted items, two for the report) and a person settles any disagreement between the first two. Every run ran on an Anthropic API key, billed to API credit.

  • 5 of 5 scheduled attempts completed with the requested model. Systems on which every attempt completed: 1 of 1.
  • Expected score per scheduled attempt: 942.6 (927.2 to 968.6).
  • Blocked: 0 (at the start 0, during the work 0). Budget exhausted: 0. Switched: 0. Lost to the lab or the operator, rerun: 1.

Answer key (matrix) SHA-256 a563e8b4cdcf03c84e7f64f8e2e5d02879406383e0bc55e61f55e38ae422ed8a · package SHA-256 566bb6798e1a0f76bef0ba7ec7ad166de82debebf44ec720249a62131ae8b45c.

GPT-5.6-sol

OpenAIeffort xhighpermissions bypassed

LEB-S-300-A v1.0 · Security track · 5 runs

Estimate 942 of 1000 LEB Platinum 95% interval · 933 – 952
  • Security800/850
  • Compatibility100/100
  • Explanation42/50
Score of each run
  1. 945
  2. 937
  3. 928
  4. 937
  5. 962

Tokens: 192,045 in · 39,903 out · 7,902,011 cache · 8,133,959 total17 min per run, on average

Comment and details

Five runs between 928 and 962, mean 942 with a 95% interval of 933 to 952, all Platinum. All five completed inside the 90-minute budget, about 8.1 million tokens and 17 minutes each (the log keeps no cost), and none broke a behavior the public tests protect (compatibility 100 in every run). Security averaged 800 of 850: the reports covered 22, 21, 20, 21 and 22 of the 24 planted vulnerabilities and the code fixed 23, 23, 23, 23 and 24 of them. No decoy was reported as a vulnerability; extra findings: 0, 0, 0, 0 and 1. The lists follow the order of the runs. The reports were rated 42 of 50. It is one system, so the interval only reflects the variation among the runs on it: how the configuration does across systems is not measured yet. Four blind judges read each delivery (two for the planted items, two for the report) and a person settles any disagreement between the first two. It ran with the client's approvals and sandbox bypassed, an exception to the series' rule against it (see the notes). Some runs ran on an API key and some on the client's stored login; the model and the client are the same.

  • 5 of 5 scheduled attempts completed with the requested model. Systems on which every attempt completed: 1 of 1.
  • Expected score per scheduled attempt: 941.8 (933.2 to 952.0).
  • Blocked: 0 (at the start 0, during the work 0). Budget exhausted: 0. Switched: 0. Lost to the lab or the operator, rerun: 0.

Answer key (matrix) SHA-256 a563e8b4cdcf03c84e7f64f8e2e5d02879406383e0bc55e61f55e38ae422ed8a · package SHA-256 566bb6798e1a0f76bef0ba7ec7ad166de82debebf44ec720249a62131ae8b45c.

Tencent Hy4

Tencenteffort highpermissions auto-approved

LEB-S-300-A v1.0 · Security track · 1 run

Estimate 942 of 1000 LEB Platinum 95% interval · 942 – 942
  • Security803/850
  • Compatibility100/100
  • Explanation39/50
Score of each run
  1. 942

Per run, on average: US$ 0.73 and 59 minutes.

Comment and details

One run of a case of five, scored 942, Platinum. It completed inside the 90-minute budget, at about US$ 0.73 (the client's own estimate) and 59 minutes, and it broke no behavior the public tests protect (compatibility 100). Security scored 803 of 850: the report covered 23 of the 24 planted vulnerabilities and the code fixed 22 of them. No decoy was reported as a vulnerability; no extra findings. The report was rated 39 of 50. It is one system, so the interval only reflects the variation among the runs on it: how the configuration does across systems is not measured yet. Four blind judges read each delivery (two for the planted items, two for the report) and a person settles any disagreement between the first two. It ran with the client's auto-approval flag, an exception to the series' rule against bypassing approvals (see the notes). It was reached through OpenRouter, whose only upstream for this model is Tencent's own (fp4 quantization); the client defines the efforts none, low and high for it, so high is the most it could ask for.

  • 1 of 1 scheduled attempt completed with the requested model. Systems on which every attempt completed: 1 of 1.
  • Expected score per scheduled attempt: 942.0 (942.0 to 942.0).
  • Blocked: 0 (at the start 0, during the work 0). Budget exhausted: 0. Switched: 0. Lost to the lab or the operator, rerun: 0.

Answer key (matrix) SHA-256 a563e8b4cdcf03c84e7f64f8e2e5d02879406383e0bc55e61f55e38ae422ed8a · package SHA-256 566bb6798e1a0f76bef0ba7ec7ad166de82debebf44ec720249a62131ae8b45c.

Kimi K3.1 Pro

Moonshot AIeffort highpermissions auto-approved

LEB-S-300-A v1.0 · Security track · 1 run

Estimate 934 of 1000 LEB Platinum 95% interval · 934 – 934
  • Security790/850
  • Compatibility100/100
  • Explanation44/50
Score of each run
  1. 934

Per run, on average: US$ 3.88 and 59 minutes.

Comment and details

One run of a case of five, scored 934, Platinum. It completed inside the 90-minute budget, at about US$ 3.88 (the client's own estimate) and 59 minutes, and it broke no behavior the public tests protect (compatibility 100). Security scored 790 of 850: the report covered 21 of the 24 planted vulnerabilities and the code fixed 23 of them. No decoy was reported as a vulnerability; no extra findings. The report was rated 44 of 50. It is one system, so the interval only reflects the variation among the runs on it: how the configuration does across systems is not measured yet. Four blind judges read each delivery (two for the planted items, two for the report) and a person settles any disagreement between the first two. It ran with the client's auto-approval flag, an exception to the series' rule against bypassing approvals (see the notes). It ran through the Kimi Code membership, where the client's cost is the list price, not a charge.

  • 1 of 1 scheduled attempt completed with the requested model. Systems on which every attempt completed: 1 of 1.
  • Expected score per scheduled attempt: 934.0 (934.0 to 934.0).
  • Blocked: 0 (at the start 0, during the work 0). Budget exhausted: 0. Switched: 0. Lost to the lab or the operator, rerun: 0.

Answer key (matrix) SHA-256 a563e8b4cdcf03c84e7f64f8e2e5d02879406383e0bc55e61f55e38ae422ed8a · package SHA-256 566bb6798e1a0f76bef0ba7ec7ad166de82debebf44ec720249a62131ae8b45c.

MiniMax M3.1 Flash

MiniMaxeffort highpermissions auto-approved

LEB-S-300-A v1.0 · Security track · 5 runs

Estimate 931 of 1000 LEB Platinum 95% interval · 912 – 951
  • Security792/850
  • Compatibility100/100
  • Explanation42/50
Score of each run
  1. 965
  2. 900
  3. 928
  4. 930
  5. 930

Per run, on average: US$ 0.29 and 56 minutes.

Comment and details

Five runs between 900 and 965, mean 931 with a 95% interval of 912 to 951, all Platinum. All five completed inside the 90-minute budget, at about US$ 0.29 (the client's own estimate) and 56 minutes each, and none broke a behavior the public tests protect (compatibility 100 in every run). Security averaged 792 of 850: the reports covered 23, 21, 21, 22 and 21 of the 24 planted vulnerabilities and the code fixed 23, 22, 22, 22 and 22 of them. No decoy was reported as a vulnerability; extra findings: 0, 6, 0, 0 and 4. The lists follow the order of the runs. The reports were rated 40 to 44 of 50. Penalties: run 5 lost 15 points for a new defect introduced by its own change. It is one system, so the interval only reflects the variation among the runs on it: how the configuration does across systems is not measured yet. Three attempts were lost to the lab or the operator and rerun. Four blind judges read each delivery (two for the planted items, two for the report) and a person settles any disagreement between the first two. It ran with the client's auto-approval flag, an exception to the series' rule against bypassing approvals (see the notes).

  • 5 of 5 scheduled attempts completed with the requested model. Systems on which every attempt completed: 1 of 1.
  • Expected score per scheduled attempt: 930.6 (912.0 to 950.6).
  • Blocked: 0 (at the start 0, during the work 0). Budget exhausted: 0. Switched: 0. Lost to the lab or the operator, rerun: 3.

Answer key (matrix) SHA-256 a563e8b4cdcf03c84e7f64f8e2e5d02879406383e0bc55e61f55e38ae422ed8a · package SHA-256 566bb6798e1a0f76bef0ba7ec7ad166de82debebf44ec720249a62131ae8b45c.

Claude Sonnet 5.5

Anthropiceffort medium

LEB-S-300-A v1.0 · Security track · 5 runs

Estimate 915 of 1000 LEB Platinum 95% interval · 886 – 946
  • Security775/850
  • Compatibility100/100
  • Explanation40/50
Score of each run
  1. 913
  2. 956
  3. 952
  4. 881
  5. 873

Per run, on average: US$ 1.10 and 13 minutes.

Comment and details

Five runs between 873 and 956, mean 915 with a 95% interval of 886 to 946, three Platinum and two Gold. All five completed inside the 90-minute budget, at about US$ 1.10 and 13 minutes each, and none broke a behavior the public tests protect (compatibility 100 in every run). Security averaged 775 of 850: the reports covered 20, 21, 21, 18 and 19 of the 24 planted vulnerabilities and the code fixed 23, 24, 24, 23 and 22 of them. No decoy was reported as a vulnerability; extra findings: 4, 0, 2, 4 and 0. The lists follow the order of the runs. The reports were rated 38 to 41 of 50. It is one system, so the interval only reflects the variation among the runs on it: how the configuration does across systems is not measured yet. One attempt was lost to the lab or the operator and rerun. Four blind judges read each delivery (two for the planted items, two for the report) and a person settles any disagreement between the first two. Some runs used an Anthropic API key, some the owner's Claude subscription (a long-lived token), where the client's cost is the list price; same model and client.

  • 5 of 5 scheduled attempts completed with the requested model. Systems on which every attempt completed: 1 of 1.
  • Expected score per scheduled attempt: 915.0 (885.8 to 945.8).
  • Blocked: 0 (at the start 0, during the work 0). Budget exhausted: 0. Switched: 0. Lost to the lab or the operator, rerun: 1.

Answer key (matrix) SHA-256 a563e8b4cdcf03c84e7f64f8e2e5d02879406383e0bc55e61f55e38ae422ed8a · package SHA-256 566bb6798e1a0f76bef0ba7ec7ad166de82debebf44ec720249a62131ae8b45c.

GPT-6-sol

OpenAIeffort xhighpermissions bypassed

LEB-S-300-A v1.0 · Security track · 1 run

Estimate 903 of 1000 LEB Platinum 95% interval · 903 – 903
  • Security761/850
  • Compatibility100/100
  • Explanation42/50
Score of each run
  1. 903

Tokens: 189,900 in · 58,685 out · 13,108,902 cache · 13,357,487 total22 min per run, on average

Comment and details

One run of a case of five, scored 903, Platinum. It completed inside the 90-minute budget, about 13.4 million tokens and 22 minutes (the log keeps no cost), and it broke no behavior the public tests protect (compatibility 100). Security scored 761 of 850: the report covered 20 of the 24 planted vulnerabilities and the code fixed 22 of them. No decoy was reported as a vulnerability; extra findings: 4. The report was rated 42 of 50. It is one system, so the interval only reflects the variation among the runs on it: how the configuration does across systems is not measured yet. Four blind judges read each delivery (two for the planted items, two for the report) and a person settles any disagreement between the first two. It ran with the client's approvals and sandbox bypassed, an exception to the series' rule against it (see the notes).

  • 1 of 1 scheduled attempt completed with the requested model. Systems on which every attempt completed: 1 of 1.
  • Expected score per scheduled attempt: 903.0 (903.0 to 903.0).
  • Blocked: 0 (at the start 0, during the work 0). Budget exhausted: 0. Switched: 0. Lost to the lab or the operator, rerun: 0.

Answer key (matrix) SHA-256 a563e8b4cdcf03c84e7f64f8e2e5d02879406383e0bc55e61f55e38ae422ed8a · package SHA-256 566bb6798e1a0f76bef0ba7ec7ad166de82debebf44ec720249a62131ae8b45c.

GPT-5.6-luna

OpenAIeffort xhighpermissions bypassed

LEB-S-300-A v1.0 · Security track · 3 runs

Estimate 891 of 1000 LEB Gold 95% interval · 819 – 934
  • Security757/850
  • Compatibility100/100
  • Explanation40/50
Score of each run
  1. 921
  2. 819
  3. 934

Tokens: 172,374 in · 41,216 out · 10,577,341 cache · 10,790,932 total16 min per run, on average

Comment and details

Three runs of a case of five, between 819 and 934, mean 891 (the interval, 819 to 934, is the range of the runs), two Platinum and one Gold. All three completed inside the 90-minute budget, about 10.8 million tokens and 16 minutes each (the log keeps no cost), and none broke a behavior the public tests protect (compatibility 100 in every run). Security averaged 757 of 850: the reports covered 21, 18 and 21 of the 24 planted vulnerabilities and the code fixed 22, 20 and 23 of them. No decoy was reported as a vulnerability; no extra findings. The lists follow the order of the runs. The reports were rated 39 to 41 of 50. Penalties: run 2 lost 15 points for a new defect introduced by its own change. It is one system, so the interval only reflects the variation among the runs on it: how the configuration does across systems is not measured yet. Four blind judges read each delivery (two for the planted items, two for the report) and a person settles any disagreement between the first two. It ran with the client's approvals and sandbox bypassed, an exception to the series' rule against it (see the notes).

  • 3 of 3 scheduled attempts completed with the requested model. Systems on which every attempt completed: 1 of 1.
  • Expected score per scheduled attempt: 891.3 (819.0 to 934.0).
  • Blocked: 0 (at the start 0, during the work 0). Budget exhausted: 0. Switched: 0. Lost to the lab or the operator, rerun: 0.

Answer key (matrix) SHA-256 a563e8b4cdcf03c84e7f64f8e2e5d02879406383e0bc55e61f55e38ae422ed8a · package SHA-256 566bb6798e1a0f76bef0ba7ec7ad166de82debebf44ec720249a62131ae8b45c.

GPT-5.6-terra

OpenAIeffort xhighpermissions bypassed

LEB-S-300-A v1.0 · Security track · 3 runs

Estimate 888 of 1000 LEB Gold 95% interval · 873 – 897
  • Security746/850
  • Compatibility100/100
  • Explanation41/50
Score of each run
  1. 897
  2. 873
  3. 893

Tokens: 167,859 in · 36,385 out · 6,010,810 cache · 6,215,054 total14 min per run, on average

Comment and details

Three runs of a case of five, between 873 and 897, mean 888 (the interval, 873 to 897, is the range of the runs), all Gold. All three completed inside the 90-minute budget, about 6.2 million tokens and 14 minutes each (the log keeps no cost), and none broke a behavior the public tests protect (compatibility 100 in every run). Security averaged 746 of 850: the reports covered 18, 16 and 19 of the 24 planted vulnerabilities and the code fixed 23, 23 and 22 of them. No decoy was reported as a vulnerability; extra findings: 0, 2 and 0. The lists follow the order of the runs. The reports were rated 41 to 42 of 50. It is one system, so the interval only reflects the variation among the runs on it: how the configuration does across systems is not measured yet. Four blind judges read each delivery (two for the planted items, two for the report) and a person settles any disagreement between the first two. It ran with the client's approvals and sandbox bypassed, an exception to the series' rule against it (see the notes).

  • 3 of 3 scheduled attempts completed with the requested model. Systems on which every attempt completed: 1 of 1.
  • Expected score per scheduled attempt: 887.7 (873.0 to 897.0).
  • Blocked: 0 (at the start 0, during the work 0). Budget exhausted: 0. Switched: 0. Lost to the lab or the operator, rerun: 0.

Answer key (matrix) SHA-256 a563e8b4cdcf03c84e7f64f8e2e5d02879406383e0bc55e61f55e38ae422ed8a · package SHA-256 566bb6798e1a0f76bef0ba7ec7ad166de82debebf44ec720249a62131ae8b45c.

Kimi For Coding

Moonshot AIdefault effort (not configurable)permissions auto-approved

LEB-S-300-A v1.0 · Security track · 1 run

Estimate 875 of 1000 LEB Gold 95% interval · 875 – 875
  • Security731/850
  • Compatibility100/100
  • Explanation44/50
Score of each run
  1. 875

Per run, on average: US$ 0.00 and 42 minutes.

Comment and details

One run of a case of five, scored 875, Gold. It completed inside the 90-minute budget, at about US$ 0.00 (the client's own estimate) and 42 minutes, and it broke no behavior the public tests protect (compatibility 100). Security scored 731 of 850: the report covered 19 of the 24 planted vulnerabilities and the code fixed 20 of them. No decoy was reported as a vulnerability; extra findings: 2. The report was rated 44 of 50. It is one system, so the interval only reflects the variation among the runs on it: how the configuration does across systems is not measured yet. Four blind judges read each delivery (two for the planted items, two for the report) and a person settles any disagreement between the first two. It ran with the client's auto-approval flag, an exception to the series' rule against bypassing approvals (see the notes). It ran through the Kimi Code membership under the alias kimi-for-coding, which the lab was told pointed to Kimi K2.8 Preview on 2026-11-07; the client's cost is the list price, not a charge.

  • 1 of 1 scheduled attempt completed with the requested model. Systems on which every attempt completed: 1 of 1.
  • Expected score per scheduled attempt: 875.0 (875.0 to 875.0).
  • Blocked: 0 (at the start 0, during the work 0). Budget exhausted: 0. Switched: 0. Lost to the lab or the operator, rerun: 0.

Answer key (matrix) SHA-256 a563e8b4cdcf03c84e7f64f8e2e5d02879406383e0bc55e61f55e38ae422ed8a · package SHA-256 566bb6798e1a0f76bef0ba7ec7ad166de82debebf44ec720249a62131ae8b45c.

DeepSeek V4 Pro

DeepSeekeffort maxpermissions auto-approved

LEB-S-300-A v1.0 · Security track · 3 runs

Estimate 871 of 1000 LEB Gold 95% interval · 831 – 907
  • Security729/850
  • Compatibility100/100
  • Explanation42/50
Score of each run
  1. 875
  2. 907
  3. 831

Per run, on average: US$ 0.41 and 36 minutes.

Comment and details

Three runs of a case of five, between 831 and 907, mean 871 (the interval, 831 to 907, is the range of the runs), one Platinum and two Gold. All three completed inside the 90-minute budget, at about US$ 0.41 (the client's own estimate) and 36 minutes each, and none broke a behavior the public tests protect (compatibility 100 in every run). Security averaged 729 of 850: the reports covered 21, 21 and 18 of the 24 planted vulnerabilities and the code fixed 20, 21 and 20 of them. No decoy was reported as a vulnerability; no extra findings. The lists follow the order of the runs. The reports were rated 40 to 43 of 50. It is one system, so the interval only reflects the variation among the runs on it: how the configuration does across systems is not measured yet. Four blind judges read each delivery (two for the planted items, two for the report) and a person settles any disagreement between the first two. It ran with the client's auto-approval flag, an exception to the series' rule against bypassing approvals (see the notes).

  • 3 of 3 scheduled attempts completed with the requested model. Systems on which every attempt completed: 1 of 1.
  • Expected score per scheduled attempt: 871.0 (831.0 to 907.0).
  • Blocked: 0 (at the start 0, during the work 0). Budget exhausted: 0. Switched: 0. Lost to the lab or the operator, rerun: 0.

Answer key (matrix) SHA-256 a563e8b4cdcf03c84e7f64f8e2e5d02879406383e0bc55e61f55e38ae422ed8a · package SHA-256 566bb6798e1a0f76bef0ba7ec7ad166de82debebf44ec720249a62131ae8b45c.

Kimi For Coding (highspeed)

Moonshot AIdefault effort (not configurable)permissions auto-approved

LEB-S-300-A v1.0 · Security track · 1 run

Estimate 693 of 1000 LEB Silver 95% interval · 693 – 693
  • Security552/850
  • Compatibility100/100
  • Explanation41/50
Score of each run
  1. 693

Per run, on average: US$ 0.00 and 43 minutes.

Comment and details

One run of a case of five, scored 693, Silver. It completed inside the 90-minute budget, at about US$ 0.00 (the client's own estimate) and 43 minutes, and it broke no behavior the public tests protect (compatibility 100). Security scored 552 of 850: the report covered 15 of the 24 planted vulnerabilities and the code fixed 15 of them. No decoy was reported as a vulnerability; no extra findings. The report was rated 41 of 50. It is one system, so the interval only reflects the variation among the runs on it: how the configuration does across systems is not measured yet. Four blind judges read each delivery (two for the planted items, two for the report) and a person settles any disagreement between the first two. It ran with the client's auto-approval flag, an exception to the series' rule against bypassing approvals (see the notes). It ran through the Kimi Code membership under the alias kimi-for-coding-highspeed, which the lab was told pointed to Kimi K2.7 Code Highspeed on 2026-11-07; the client's cost is the list price, not a charge.

  • 1 of 1 scheduled attempt completed with the requested model. Systems on which every attempt completed: 1 of 1.
  • Expected score per scheduled attempt: 693.0 (693.0 to 693.0).
  • Blocked: 0 (at the start 0, during the work 0). Budget exhausted: 0. Switched: 0. Lost to the lab or the operator, rerun: 0.

Answer key (matrix) SHA-256 a563e8b4cdcf03c84e7f64f8e2e5d02879406383e0bc55e61f55e38ae422ed8a · package SHA-256 566bb6798e1a0f76bef0ba7ec7ad166de82debebf44ec720249a62131ae8b45c.

Recursive Flint

Recursivedefault effort (not configurable)permissions auto-approved

LEB-S-300-A v1.0 · Security track · 1 run

Estimate 516 of 1000 LEB Bronze 95% interval · 516 – 516
  • Security378/850
  • Compatibility100/100
  • Explanation38/50
Score of each run
  1. 516

Per run, on average: US$ 0.00 and 22 minutes.

Comment and details

One run of a case of five, scored 516, Bronze. It completed inside the 90-minute budget, at about US$ 0.00 (the client's own estimate) and 22 minutes, and it broke no behavior the public tests protect (compatibility 100). Security scored 378 of 850: the report covered 10 of the 24 planted vulnerabilities and the code fixed 11 of them. No decoy was reported as a vulnerability; no extra findings. The report was rated 38 of 50. It is one system, so the interval only reflects the variation among the runs on it: how the configuration does across systems is not measured yet. Four blind judges read each delivery (two for the planted items, two for the report) and a person settles any disagreement between the first two. It ran with the client's auto-approval flag, an exception to the series' rule against bypassing approvals (see the notes). It was reached through OpenRouter's free variant, with no provider pinned (the endpoint that answered the lab's probe was Recursive's); the client defines no effort for it, so it ran at the model's default.

  • 1 of 1 scheduled attempt completed with the requested model. Systems on which every attempt completed: 1 of 1.
  • Expected score per scheduled attempt: 516.0 (516.0 to 516.0).
  • Blocked: 0 (at the start 0, during the work 0). Budget exhausted: 0. Switched: 0. Lost to the lab or the operator, rerun: 0.

Answer key (matrix) SHA-256 a563e8b4cdcf03c84e7f64f8e2e5d02879406383e0bc55e61f55e38ae422ed8a · package SHA-256 566bb6798e1a0f76bef0ba7ec7ad166de82debebf44ec720249a62131ae8b45c.

NVIDIA Nemotron 3.5 Super VL

NVIDIAeffort highpermissions auto-approved

LEB-S-300-A v1.0 · Security track · 1 run

Estimate 515 of 1000 LEB Bronze 95% interval · 515 – 515
  • Security374/850
  • Compatibility100/100
  • Explanation41/50
Score of each run
  1. 515

Per run, on average: US$ 0.00 and 30 minutes.

Comment and details

One run of a case of five, scored 515, Bronze. It completed inside the 90-minute budget, at about US$ 0.00 (the client's own estimate) and 30 minutes, and it broke no behavior the public tests protect (compatibility 100). Security scored 374 of 850: the report covered 11 of the 24 planted vulnerabilities and the code fixed 10 of them. No decoy was reported as a vulnerability; no extra findings. The report was rated 41 of 50. It is one system, so the interval only reflects the variation among the runs on it: how the configuration does across systems is not measured yet. Four blind judges read each delivery (two for the planted items, two for the report) and a person settles any disagreement between the first two. It ran with the client's auto-approval flag, an exception to the series' rule against bypassing approvals (see the notes). It was reached through OpenRouter's free variant, with no provider pinned (the endpoint that answered the lab's probe was NVIDIA's); the client defines the efforts low, medium and high for it, so high is the most it could ask for.

  • 1 of 1 scheduled attempt completed with the requested model. Systems on which every attempt completed: 1 of 1.
  • Expected score per scheduled attempt: 515.0 (515.0 to 515.0).
  • Blocked: 0 (at the start 0, during the work 0). Budget exhausted: 0. Switched: 0. Lost to the lab or the operator, rerun: 0.

Answer key (matrix) SHA-256 a563e8b4cdcf03c84e7f64f8e2e5d02879406383e0bc55e61f55e38ae422ed8a · package SHA-256 566bb6798e1a0f76bef0ba7ec7ad166de82debebf44ec720249a62131ae8b45c.

Apodex 1.1 Mini

Apodexeffort highpermissions auto-approved

LEB-S-300-A v1.0 · Security track · 5 runs

Estimate 439 of 1000 LEB Bronze 95% interval · 370 – 528
  • Security300/850
  • Compatibility100/100
  • Explanation39/50
Score of each run
  1. 364
  2. 468
  3. 343
  4. 604
  5. 414

Per run, on average: US$ 0.00 and 26 minutes.

Comment and details

Five runs between 343 and 604, mean 439 with a 95% interval of 370 to 528, one Silver and two Bronze and two Reprovada. All five completed inside the 90-minute budget, at about US$ 0.00 (the client's own estimate) and 26 minutes each, and none broke what the public tests protect (compatibility 100 in every run). Security averaged 300 of 850: the reports covered 7, 10, 7, 14 and 7 of the 24 planted vulnerabilities and the code fixed 6, 10, 6, 12 and 8 of them. No decoy was reported as a vulnerability; extra findings: 0, 0, 0, 1 and 0. The lists follow the order of the runs. The reports were rated 36 to 41 of 50. It is one system: the interval reflects only the variation among its runs, and how it does across systems is not measured yet. One attempt was lost to the lab or the operator and rerun. Four blind judges read each delivery (two for the planted items, two for the report); a person settles disagreements between the first two. It ran with the client's auto-approval flag, an exception to the series' rule against bypassing approvals (see the notes). It was reached through Novita AI's own API (listed there at no price); the client's top effort for it is high.

  • 5 of 5 scheduled attempts completed with the requested model. Systems on which every attempt completed: 1 of 1.
  • Expected score per scheduled attempt: 438.6 (369.8 to 528.0).
  • Blocked: 0 (at the start 0, during the work 0). Budget exhausted: 0. Switched: 0. Lost to the lab or the operator, rerun: 1.

Answer key (matrix) SHA-256 a563e8b4cdcf03c84e7f64f8e2e5d02879406383e0bc55e61f55e38ae422ed8a · package SHA-256 566bb6798e1a0f76bef0ba7ec7ad166de82debebf44ec720249a62131ae8b45c.

NVIDIA Nemotron 3 Ultra

NVIDIAeffort highpermissions auto-approved

LEB-S-300-A v1.0 · Security track · 1 run

Estimate 331 of 1000 Failed 95% interval · 331 – 331
  • Security196/850
  • Compatibility100/100
  • Explanation35/50
Score of each run
  1. 331

Per run, on average: US$ 0.00 and 50 minutes.

Comment and details

One run of a case of five, scored 331, Reprovada. It completed inside the 90-minute budget, at about US$ 0.00 (the client's own estimate) and 50 minutes, and it broke no behavior the public tests protect (compatibility 100). Security scored 196 of 850: the report covered 6 of the 24 planted vulnerabilities and the code fixed 5 of them. No decoy was reported as a vulnerability; no extra findings. The report was rated 35 of 50. It is one system, so the interval only reflects the variation among the runs on it: how the configuration does across systems is not measured yet. Four blind judges read each delivery (two for the planted items, two for the report) and a person settles any disagreement between the first two. It ran with the client's auto-approval flag, an exception to the series' rule against bypassing approvals (see the notes). It was reached through OpenRouter's free variant, with no provider pinned (the endpoint that answered the lab's probe was NVIDIA's); the client defines the efforts none, medium and high for it, so high is the most it could ask for.

  • 1 of 1 scheduled attempt completed with the requested model. Systems on which every attempt completed: 1 of 1.
  • Expected score per scheduled attempt: 331.0 (331.0 to 331.0).
  • Blocked: 0 (at the start 0, during the work 0). Budget exhausted: 0. Switched: 0. Lost to the lab or the operator, rerun: 0.

Answer key (matrix) SHA-256 a563e8b4cdcf03c84e7f64f8e2e5d02879406383e0bc55e61f55e38ae422ed8a · package SHA-256 566bb6798e1a0f76bef0ba7ec7ad166de82debebf44ec720249a62131ae8b45c.

XingChen Xing4.0 29B A4B

XingCheneffort highpermissions auto-approved

LEB-S-300-A v1.0 · Security track · 1 run

Estimate 217 of 1000 Failed 95% interval · 217 – 217
  • Security85/850
  • Compatibility100/100
  • Explanation32/50
Score of each run
  1. 217

Per run, on average: US$ 0.00 and 19 minutes.

Comment and details

One run of a case of five, scored 217, Reprovada. It completed inside the 90-minute budget, at about US$ 0.00 (the client's own estimate) and 19 minutes, and it broke no behavior the public tests protect (compatibility 100). Security scored 85 of 850: the report covered 3 of the 24 planted vulnerabilities and the code fixed 3 of them. No decoy was reported as a vulnerability; no extra findings. The report was rated 32 of 50. It is one system, so the interval only reflects the variation among the runs on it: how the configuration does across systems is not measured yet. Four blind judges read each delivery (two for the planted items, two for the report) and a person settles any disagreement between the first two. It ran with the client's auto-approval flag, an exception to the series' rule against bypassing approvals (see the notes). It was reached through OpenRouter's free variant, with no provider pinned (the endpoint that answered the lab's probe was Phala's); the client defines the efforts low, medium and high for it, so high is the most it could ask for.

  • 1 of 1 scheduled attempt completed with the requested model. Systems on which every attempt completed: 1 of 1.
  • Expected score per scheduled attempt: 217.0 (217.0 to 217.0).
  • Blocked: 0 (at the start 0, during the work 0). Budget exhausted: 0. Switched: 0. Lost to the lab or the operator, rerun: 0.

Answer key (matrix) SHA-256 a563e8b4cdcf03c84e7f64f8e2e5d02879406383e0bc55e61f55e38ae422ed8a · package SHA-256 566bb6798e1a0f76bef0ba7ec7ad166de82debebf44ec720249a62131ae8b45c.

NVIDIA Nemotron 3.5 Lightning

NVIDIAeffort highpermissions auto-approved

LEB-S-300-A v1.0 · Security track · 1 run

Estimate 191 of 1000 Failed 95% interval · 191 – 191
  • Security64/850
  • Compatibility100/100
  • Explanation27/50
Score of each run
  1. 191

Per run, on average: US$ 0.00 and 13 minutes.

Comment and details

One run of a case of five, scored 191, Reprovada. It completed inside the 90-minute budget, at about US$ 0.00 (the client's own estimate) and 13 minutes, and it broke no behavior the public tests protect (compatibility 100). Security scored 64 of 850: the report covered 3 of the 24 planted vulnerabilities and the code fixed 1 of them. No decoy was reported as a vulnerability; no extra findings. The report was rated 27 of 50. It is one system, so the interval only reflects the variation among the runs on it: how the configuration does across systems is not measured yet. Four blind judges read each delivery (two for the planted items, two for the report) and a person settles any disagreement between the first two. It ran with the client's auto-approval flag, an exception to the series' rule against bypassing approvals (see the notes). It was reached through OpenRouter's free variant, with no provider pinned (the endpoint that answered the lab's probe was NVIDIA's); the client defines the efforts low, medium and high for it, so high is the most it could ask for.

  • 1 of 1 scheduled attempt completed with the requested model. Systems on which every attempt completed: 1 of 1.
  • Expected score per scheduled attempt: 191.0 (191.0 to 191.0).
  • Blocked: 0 (at the start 0, during the work 0). Budget exhausted: 0. Switched: 0. Lost to the lab or the operator, rerun: 0.

Answer key (matrix) SHA-256 a563e8b4cdcf03c84e7f64f8e2e5d02879406383e0bc55e61f55e38ae422ed8a · package SHA-256 566bb6798e1a0f76bef0ba7ec7ad166de82debebf44ec720249a62131ae8b45c.

NVIDIA Nemotron 3 Nano Omni

NVIDIAeffort maxpermissions auto-approved

LEB-S-300-A v1.0 · Security track · 1 run

Estimate 122 of 1000 Failed 95% interval · 122 – 122
  • Security17/850
  • Compatibility100/100
  • Explanation30/50
Score of each run
  1. 122

Per run, on average: US$ 0.00 and 2 minutes.

Comment and details

One run of a case of five, scored 122, Reprovada. It completed inside the 90-minute budget, at about US$ 0.00 (the client's own estimate) and 2 minutes, and it broke no behavior the public tests protect (compatibility 100). Security scored 17 of 850: the report covered 1 of the 24 planted vulnerabilities and the code fixed 0 of them. Decoys reported as vulnerabilities, of 6: 1; no extra findings. The report was rated 30 of 50. Penalties: run 1 lost 20 points for a broken behavior no fix was blamed for; run 1 lost 5 points for reporting something that is not a flaw. It is one system: the interval reflects only the variation among its runs, and how it does across systems is not measured yet. Four blind judges read each delivery (two for the planted items, two for the report); a person settles disagreements between the first two. It ran with the client's auto-approval flag, an exception to the series' rule against bypassing approvals (see the notes). It was reached through OpenRouter's free variant, with no provider pinned (the endpoint that answered the lab's probe was NVIDIA's); the client defines the efforts high and max for it, so max is the most it could ask for.

  • 1 of 1 scheduled attempt completed with the requested model. Systems on which every attempt completed: 1 of 1.
  • Expected score per scheduled attempt: 122.0 (122.0 to 122.0).
  • Blocked: 0 (at the start 0, during the work 0). Budget exhausted: 0. Switched: 0. Lost to the lab or the operator, rerun: 0.

Answer key (matrix) SHA-256 a563e8b4cdcf03c84e7f64f8e2e5d02879406383e0bc55e61f55e38ae422ed8a · package SHA-256 566bb6798e1a0f76bef0ba7ec7ad166de82debebf44ec720249a62131ae8b45c.

Cohere North Mini Code

Cohereeffort highpermissions auto-approved

LEB-S-300-A v1.0 · Security track · 1 run

Estimate 27 of 1000 Failed 95% interval · 27 – 27
  • Security0/850
  • Compatibility100/100
  • Explanation22/50
Score of each run
  1. 27

Per run, on average: US$ 0.00 and 18 minutes.

Comment and details

One run of a case of five, scored 27, Reprovada. It completed inside the 90-minute budget, at about US$ 0.00 (the client's own estimate) and 18 minutes, and it broke no behavior the public tests protect (compatibility 100). Security scored 0 of 850: the report covered 0 of the 24 planted vulnerabilities and the code fixed 0 of them. No decoy was reported as a vulnerability; no extra findings. The report was rated 22 of 50. Penalties: it lost 15 points for a new defect introduced by its own change and 80 for a broken behavior no fix was blamed for. It is one system: the interval reflects only the variation among its runs, and how it does across systems is not measured yet. Four blind judges read each delivery (two for the planted items, two for the report); a person settles disagreements between the first two. It ran with the client's auto-approval flag, an exception to the series' rule against bypassing approvals (see the notes). It was reached through OpenRouter's free variant, with no provider pinned (the endpoint that answered the lab's probe was Cohere's); the client defines the efforts low, medium and high for it, so high is the most it could ask for.

  • 1 of 1 scheduled attempt completed with the requested model. Systems on which every attempt completed: 1 of 1.
  • Expected score per scheduled attempt: 27.0 (27.0 to 27.0).
  • Blocked: 0 (at the start 0, during the work 0). Budget exhausted: 0. Switched: 0. Lost to the lab or the operator, rerun: 0.

Answer key (matrix) SHA-256 a563e8b4cdcf03c84e7f64f8e2e5d02879406383e0bc55e61f55e38ae422ed8a · package SHA-256 566bb6798e1a0f76bef0ba7ec7ad166de82debebf44ec720249a62131ae8b45c.

What this track measures

Finding and fixing vulnerabilities in a system that works, without breaking it. A fix counts only when all of these hold:

  • the reference attack and its variations no longer work;
  • the legitimate user keeps the function;
  • the contracts of the manifest still hold.

Turning a feature off, refusing every request or answering every input with an error is not a fix. Compatibility stays in the score: a fix that closes the hole and breaks the system is a bad delivery. False positives are measured on correct code that looks risky.

The Default and Security scores of a configuration are shown side by side and never added.

Where the series stands

The next series is a proposal: its design was decided on 12 October 2026, and its normative texts (the spec, the protocol, the scoring and the levels) are written after a pilot has validated the process. The pilot has begun on system A, and its cases so far are above. It changes nothing in LEB-100 or LEB-300, whose results stay as published. There is no scoreboard yet: it needs more configurations and more systems.

The reference systems

Each track is measured on several reference systems, and each system yields both tracks: two planting profiles of the same clean code. The same letter is the same system. The pilot will have 3 systems; the evaluation set, about 6.

SystemDomainStackInstanceStatus
ACondominium management (CondoDesk)Java 21 · Maven · PostgreSQLLEB-S-300-APilot cases under way

How a case runs

A case is one system, one track and one agent configuration.

  1. 5 runs per case, and all of them count.

  2. The requested model is pinned in the client, in the main conversation and in every subagent, so that no substitute can answer.

  3. An automated lab runs each case, from the restoration of the machine to the filing of the evidence.

What will be published

For each configuration and track:

  • the quality of the evaluable deliveries, with its uncertainty interval;
  • the completion rate with the requested model;
  • the expected score per scheduled attempt;
  • blocks (at the start and during the work), model switches, exhausted budgets and lab failures, each counted separately.

The answer key

The answer key of an instance is published on GitHub with the instance, before its first run, and the machines that run the agents cannot reach GitHub. Each run also records the model's training cutoff, for what a model may have seen in training.

Comparison

A score of the next series is never set beside one of LEB-100 or LEB-300.