Claude Opus 4.5 vs Devstral Small 2 (24B)
Anthropic Claude Opus 4.5 | Mistral Devstral Small 2 (24B) | |
|---|---|---|
| Overview | ||
| Company | Anthropic | Mistral |
| Release date | Nov 24 2025 | Dec 9 2025 |
| Access | Proprietary | Open Weight |
| Benchmarks | ||
Nonsense detection BullshitBench v2Given a confidently-worded but nonsensical prompt, does the AI spot that it makes no sense and push back — instead of playing along and inventing an answer? The score is how often it clearly called out the nonsense. Higher is better. | 90% | — |
Coding SWE-Bench VerifiedReal coding tasks pulled from open-source projects — the AI has to find and fix actual bugs. A human-checked version of the original SWE-Bench. Higher is better. | 80.9% | — |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 87% | — |
| Timeline | ||
| Release gap | Claude Opus 4.5 shipped 15 days before Devstral Small 2 (24B) | |
Which is better: Claude Opus 4.5 or Devstral Small 2 (24B)?
Claude Opus 4.5 and Devstral Small 2 (24B) don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Claude Opus 4.5 shipped 15 days before Devstral Small 2 (24B), so benchmark comparisons should account for the intervening progress.
Claude Opus 4.5 is proprietary, while Devstral Small 2 (24B) is open weight.
Direct benchmark comparisons are unavailable — Claude Opus 4.5 and Devstral Small 2 (24B) don't publish scores on any of the same benchmarks.
Frequently asked questions
Claude Opus 4.5 was released by Anthropic on Nov 24 2025.
Devstral Small 2 (24B) was released by Mistral on Dec 9 2025.
Claude Opus 4.5 is a proprietary model released by Anthropic. Devstral Small 2 (24B) is an open weight model released by Mistral.
Other comparisons
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