Benchmark Almanac

WMDP Cyber

Grok 4.20 91% leads since March 2026
Mixtral 8x7B 52% leads
Grok 4.20 91% leads since March 2026
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Models answer multiple-choice questions on offensive cybersecurity knowledge. The cybersecurity split of the Weapons of Mass Destruction Proxy benchmark.

1,987 test questions in the wmdp-cyber config on Hugging Face, MIT licensed. Mainly used to measure unlearning. The almanac already holds the biology and chemistry splits.

Made by
CAIS + Scale AI et al.
Released
March 2024
Kind
Finding and exploiting real bugs
Level
Expert
Scored
Checked automatically
Answers
Multiple choice
Tasks
All public
Strongest model tested
Grok 4.20 #60 on the capability index
Last in a launch post
March 2026, dropped after it saturated
Last model added
April 2026
Scores refreshed
November 12th, 2026

In the authors’ words

The White House Executive Order on Artificial Intelligence highlights the risks of large language models (LLMs) empowering malicious actors in developing biological, cyber, and chemical weapons. To measure these risks of malicious use, government institutions and major AI labs are developing evaluations for hazardous capabilities in LLMs. However, current evaluations are private, preventing further research into mitigating risk. Furthermore, they focus on only a few, highly specific pathways for malicious use. To fill these gaps, we publicly release the Weapons of Mass Destruction Proxy (WMDP) benchmark, a dataset of 3,668 multiple-choice questions that serve as a proxy measurement of hazardous knowledge in biosecurity, cybersecurity, and chemical security. WMDP was developed by a consortium of academics and technical consultants, and was stringently filtered to eliminate sensitive information prior to public release. WMDP serves two roles: first, as an evaluation for hazardous knowledge in LLMs, and second, as a benchmark for unlearning methods to remove such hazardous knowledge. To guide progress on unlearning, we develop RMU, a state-of-the-art unlearning method based on controlling model representations. RMU reduces model performance on WMDP while maintaining general capabilities in areas such as biology and computer science, suggesting that unlearning may be a concrete path towards reducing malicious use from LLMs. We release our benchmark and code publicly at https://wmdp.ai

Abstract of The WMDP Benchmark: Measuring and Reducing Malicious Use With Unlearning (arXiv:2403.03218, CC0)
2
Models scored in lab cards
1
Launch post lists it, from 1 lab
2
System cards report it, from 2 labs

Grok 4.20 leads with 91%

Best score per model as labs report them in their own cards. Labs pick their own settings, so these compare less cleanly than independent runs.

Mixtral 8x7B leads with 52% across all independent runs

Best score per model across the official leaderboard, Epoch AI’s own runs and any board Epoch AI copied. Each bar and row names its source.

Grok 4.20 leads with 91%, claims included

Best score per model from every source, including labs’ own numbers and claims Epoch AI collected from reports and papers. Labs pick their own settings, so a claim can beat an independent run of the same model.

  1. 1 Grok 4.20 91%
  2. 2 Code World Model (CWM) 63.6%

Source: Labs’ model cards

Source: Official WMDP Cyber leaderboard

Sources: Labs’ model cards and official WMDP Cyber leaderboard

#ModelScoreSettingDateSource
1 Grok 4.20 91% Mar 2026 Lab model card
2 Code World Model (CWM) 63.6% Oct 2025 Lab model card
#ModelScoreSettingDateSource
1 Mixtral 8x7B 52% Dec 2023 Official leaderboard
2 Yi-34B 49.7% Nov 2023 Official leaderboard
#ModelScoreSettingDateSource
1 Grok 4.20 91% Mar 2026 Lab model card
2 Code World Model (CWM) 63.6% Oct 2025 Lab model card
3 Mixtral 8x7B 52% Dec 2023 Official leaderboard
4 Yi-34B 49.7% Nov 2023 Official leaderboard

The benchmark's own leaderboard has 10 entries, 2 of them models we track. Switch the scores above to rank them together.

2 models have held number one in labs’ own numbers since its release in March 2024 Number one over time 3 models have held number one with claims included since its release in March 2024

Lab claims count from the day the card came out, independent runs from the model’s release.

Meta xAI
Lab claims Passed 85% in Mar 2026, by Grok 4.20
Grok 4.20 91%

Source: Labs’ model cards

XAI’s own number for Grok 4.20 passed 85% in March 2026

All the scores we have, one dot each, so a model tested at several settings appears more than once.

On the benchmark’s own leaderboard Reported by the lab in its model card Best so far
0% 20% 40% 60% 80% 100% 2024 2025 2026 Near the ceiling (85%) Grok 4.20 Code World Model (CWM) Mixtral 8x7B 0% 20% 40% 60% 80% 100% 2024 2025 2026 Near the ceiling (85%) Grok 4.20 Code World Model (CWM)

Sources: Official WMDP Cyber leaderboard and labs’ model cards

Labs headline it less often now, last in March 2026

Launch posts from every lab that has listed it, one tick per post. Tall colored ticks include it, and short gray ones leave it out.

xAI
DateLaunch postScoreAs the post writes it
Mar 9, 2026 Grok 4.20 91 WMDP Cyber, accuracy 0.91, Grok 4.2 SA, Table 4

2 system cards report it, from 2 labs

Besides launch posts, we read the system cards, model cards and technical reports labs publish with a release. They report far more, including safety and frontier-risk tests.

DateDocumentScoreAs the document writes itSection
Apr 7, 2026 Grok 4.20 model card 91 WMDP Cyber, accuracy 0.91, Grok 4.2 SA, Table 4 Safety
Oct 8, 2025 Code World Model (CWM) technical report 63.6 WMDP-cyber accuracy (Table 2) Cyber risk

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