1 vs 1 benchmarks won
Mistral Mistral Medium 3.5 | Moonshot AI Kimi K2 (0905) | |
|---|---|---|
| Overview | ||
| Company | Mistral | Moonshot AI |
| Release date | Apr 29 2026 | Sep 5 2025 |
| Model type | — | — |
| Open source | Yes | Yes |
| Specifications | ||
Parameters | 128B | 1T |
Context window | 256k | 256k |
| Benchmarks | ||
Science reasoning GPQA Diamond | — | 75.1% |
Software engineering SWE-Bench Verified | 77.6% | 65.8% |
Multimodal understanding MMMU | — | — |
| Timeline | ||
| Release gap | Kimi K2 (0905) shipped 236 days before Mistral Medium 3.5 | |
Mistral Medium 3.5 and Kimi K2 (0905) are evenly matched across the benchmarks they both publish. Kimi K2 (0905) shipped 236 days before Mistral Medium 3.5, so benchmark comparisons should account for the intervening progress.
Mistral Medium 3.5 has 128B parameters, while Kimi K2 (0905) has 1T. Context windows are 256k (Mistral Medium 3.5) vs 256k (Kimi K2 (0905)).
On SWE-Bench Verified, Mistral Medium 3.5 scores 77.6%, 11.8 points above Kimi K2 (0905) at 65.8%.