Claude Opus 4.5 vs Codestral 25.01
Anthropic Claude Opus 4.5 | Mistral Codestral 25.01 | |
|---|---|---|
| Overview | ||
| Company | Anthropic | Mistral |
| Release date | Nov 24 2025 | Jan 13 2025 |
| Access | Proprietary | Proprietary |
| Specifications | ||
Context window | — | 256k |
| 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 | Codestral 25.01 shipped 315 days before Claude Opus 4.5 | |
Which is better: Claude Opus 4.5 or Codestral 25.01?
Claude Opus 4.5 and Codestral 25.01 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Codestral 25.01 shipped 315 days before Claude Opus 4.5, so benchmark comparisons should account for the intervening progress.
Published specifications for these two models are limited — see each model page for the latest details.
Direct benchmark comparisons are unavailable — Claude Opus 4.5 and Codestral 25.01 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.
Codestral 25.01 was released by Mistral on Jan 13 2025.
Other comparisons
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