Benchmark Almanac

WMDP Chemistry

Grok 4.20 90% leads since March 2026
Fading

Models answer 408 multiple-choice questions that proxy hazardous chemical security knowledge. Chemistry split of WMDP.

Subset of the WMDP benchmark. 408 test questions in the Hugging Face config, MIT licensed. A cybersecurity split also exists.

Made by
CAIS + Scale AI et al.
Released
March 2024
Kind
Hazardous knowledge
Level
Expert
Scored
Checked automatically
Answers
Multiple choice
Tasks
All public
Strongest model tested
Gemini 3 Pro #55 on the capability index
Last in a launch post
March 2026, dropped after it saturated
Last model added
October 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)
7
Models scored in lab cards
1
Launch post lists it, from 1 lab
7
System cards report it, from 4 labs

Grok 4.20 leads with 90%

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.

  1. 1 Grok 4.20 90%
  2. 2 Gemini 3 Pro 84.8%
  3. 3 Gemini 2.5 Pro Jun 2025 80%
  4. 4 Gemini 2.5 Pro Mar 2025 75.3%
  5. 5 Gemini 2.5 Flash Jun 2025 75%
  6. 6 Code World Model (CWM) 64.6%
  7. 7 Beam 1.0 62.4%

Source: Labs’ model cards

#ModelScoreSettingDateSource
1 Grok 4.20 90% Mar 2026 Lab model card
2 Gemini 3 Pro 84.8% Nov 2025 Lab model card
3 Gemini 2.5 Pro Jun 2025 80% Jul 2025 Lab model card
4 Gemini 2.5 Pro Mar 2025 75.3% Apr 2025 Lab model card
5 Gemini 2.5 Flash Jun 2025 75% Jul 2025 Lab model card
6 Code World Model (CWM) 64.6% Oct 2025 Lab model card
7 Beam 1.0 62.4% Oct 2026 Lab model card

4 models have held number one in labs’ own numbers since its release in March 2024

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

Google DeepMind xAI
Lab claims Passed 85% in Mar 2026, by Grok 4.20
Grok 4.20 90%

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.

Reported by the lab in its model card Best so far
0% 20% 40% 60% 80% 100% 2025 2026 Near the ceiling (85%) Grok 4.20 Gemini 3 Pro Gemini 2.5 Pro Gemini 2.5 Pro 0% 20% 40% 60% 80% 100% 2025 2026 Near the ceiling (85%) Grok 4.20 Gemini 2.5 Pro

Source: 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 90 WMDP Chem, accuracy 0.90, Grok 4.2 SA, Table 4

7 system cards report it, from 4 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
Oct 5, 2026 Beam 1.0 technical report 62.4 WMDP-Chem accuracy Bio and chem risk
Apr 7, 2026 Grok 4.20 model card 90 WMDP Chem, accuracy 0.90, Grok 4.2 SA, Table 4 Safety
Nov 18, 2025 Gemini 3 Pro system card 84.8 WMDP CHEM (N=408), mean solve rate, shuffled answer choices (Figure 1) Bio and chem risk
Oct 8, 2025 Code World Model (CWM) technical report 64.6 WMDP-Chem (Table 8) Bio and chem risk
Jul 7, 2025 Gemini 2.5 Pro technical report 80 WMDP CHEM (N=408), mean solve rate (Figure 9) Bio and chem risk
Jul 7, 2025 Gemini 2.5 Flash technical report 75 WMDP CHEM (N=408), mean solve rate (Figure 9) Bio and chem risk
Apr 28, 2025 Gemini 2.5 Pro model card 75.3 WDMP CHEM (N=408), mean solve rate over 100 shuffled runs (Figure 1) Bio and chem risk

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