1 vs 1 benchmarks won
Anthropic Claude Opus 4 | Mistral Mistral Medium 3.5 | |
|---|---|---|
| Overview | ||
| Company | Anthropic | Mistral |
| Release date | May 22 2025 | Apr 29 2026 |
| Model type | — | — |
| Open source | No | Yes |
| Specifications | ||
Parameters | — | 128B |
Context window | — | 256k |
| Benchmarks | ||
Science reasoning GPQA Diamond | 79.6% | — |
Software engineering SWE-Bench Verified | 72.5% | 77.6% |
Multimodal understanding MMMU | — | — |
| Timeline | ||
| Release gap | Claude Opus 4 shipped 342 days before Mistral Medium 3.5 | |
Claude Opus 4 and Mistral Medium 3.5 are evenly matched across the benchmarks they both publish. Claude Opus 4 shipped 342 days before Mistral Medium 3.5, so benchmark comparisons should account for the intervening progress.
Mistral Medium 3.5 is an open-source / open-weight model; Claude Opus 4 is proprietary.
On SWE-Bench Verified, Mistral Medium 3.5 scores 77.6%, 5.1 points above Claude Opus 4 at 72.5%.