Meta chemical-agent refusal evaluation
Muse Wonder Full 100% leads since Oct 2026 Only in system cards Models receive high-risk chemical prompts and the benchmark measures how often they refuse. Covers development, procurement and production stages.
In-house Meta refusal evaluation. The prompts are not public.
- Level
- Expert Specialists with years of training, often over hours of work
- Scored
- Graded by a model A language model scores each response, usually against a rubric.
- Answers
- Open-ended Free-form text, documents, designs or media judged as a whole.
2 models share the top score of 100%
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 Muse Wonder Full 100%
- 2 Muse Spark 1.3 100%
- 3 Muse Spark 1.1 99.8%
- 4 Muse Spark 99.4%
| # | Model | Score | Setting | Date | Source |
|---|---|---|---|---|---|
| 1 | Muse Wonder Full | 100% | Oct 2026 | Model card | |
| 2 | Muse Spark 1.3 | 100% | Oct 2026 | Model card | |
| 3 | Muse Spark 1.1 | 99.8% | Jul 2026 | Model card | |
| 4 | Muse Spark | 99.4% | Jun 2026 | Model card |
3 models have held number one since 2023
Lab claims count from the day the card came out, independent runs from the model’s release.
The best score passed 85% in Jun 2026
All the scores we have, one dot each, so a model tested at several settings appears more than once.
Labs report it only in system cards
We read the headline results of 479 launch posts from 51 labs, and none of them list this benchmark. Some system cards do, below.
4 system cards report it, from 1 lab
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.
| Date | Document | Score | As the document writes it | Section |
|---|---|---|---|---|
| 23 Oct 2026 | Muse Spark 1.3 system card | 100 | Chemical Agents (English) internal refusal rate, Muse Spark 1.3 (API) (Table 2, Figure 6). Multilingual 100.0, adversarial 99.7 | Bio and chem risk |
| 12 Oct 2026 | Muse Wonder Full model card | 100 | Internal Chemistry Refusal, English (CBRN Safety Evaluations table, section 4). Multilingual 100.0, adversarial 99.8 | Bio and chem risk |
| 9 Jul 2026 | Muse Spark 1.1 system card | 99.8 | Refusals: Chemical Agents refusal rate (Table 2, Figure 7) | Bio and chem risk |
| 12 Jun 2026 | Muse Spark system card | 99.4 | Refusals: Chemical Agents refusal rate, deployed system (Table 2, Figure 11) | Bio and chem risk |
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