2 vs 1 benchmarks won
Anthropic Claude Sonnet 4.5 | Mistral Mistral Medium 3.5 | |
|---|---|---|
| Overview | ||
| Company | Anthropic | Mistral |
| Release date | Sep 29 2025 | Apr 29 2026 |
| Model type | — | — |
| Open source | No | Yes |
| Specifications | ||
Parameters | — | 128B |
Context window | — | 256k |
| Benchmarks | ||
Science reasoning GPQA Diamond | 83.4% | — |
Software engineering SWE-Bench Verified | 77.2% | 77.6% |
Multimodal understanding MMMU | 68% | — |
| Timeline | ||
| Release gap | Claude Sonnet 4.5 shipped 212 days before Mistral Medium 3.5 | |
Claude Sonnet 4.5 leads Mistral Medium 3.5 on 2 of the tracked benchmarks (GPQA Diamond, SWE-Bench Verified, MMMU). Claude Sonnet 4.5 shipped 212 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 Sonnet 4.5 is proprietary.
On SWE-Bench Verified, Mistral Medium 3.5 scores 77.6%, 0.4 points above Claude Sonnet 4.5 at 77.2%.