DeepSeek DeepSeek V3.1 vs Mistral Mistral Medium 3.5 — side-by-side specs.
DeepSeek DeepSeek V3.1 | Mistral Mistral Medium 3.5 | |
|---|---|---|
| Overview | ||
| Company | DeepSeek | Mistral |
| Release date | Aug 21 2025 | Apr 29 2026 |
| Model type | — | — |
| Open source | Yes | Yes |
| Specifications | ||
Parameters | — | 128B |
Context window | — | 256k |
| Benchmarks | ||
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. | — | 77.6% |
| Timeline | ||
| Release gap | DeepSeek V3.1 shipped 251 days before Mistral Medium 3.5 | |
DeepSeek V3.1 and Mistral Medium 3.5 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. DeepSeek V3.1 shipped 251 days before Mistral Medium 3.5, 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 — DeepSeek V3.1 and Mistral Medium 3.5 don't publish scores on any of the same benchmarks.