2 vs 0 benchmarks won
Moonshot AI Kimi K2 (0905) | OpenAI gpt-oss-20b | |
|---|---|---|
| Overview | ||
| Company | Moonshot AI | OpenAI |
| Release date | Sep 5 2025 | Aug 5 2025 |
| Model type | — | — |
| Open source | Yes | Yes |
| Specifications | ||
Parameters | 1T | — |
Context window | 256k | — |
| Benchmarks | ||
Science reasoning GPQA Diamond | 75.1% | — |
Software engineering SWE-Bench Verified | 65.8% | — |
Multimodal understanding MMMU | — | — |
| Timeline | ||
| Release gap | gpt-oss-20b shipped 31 days before Kimi K2 (0905) | |
Kimi K2 (0905) leads gpt-oss-20b on 2 of the tracked benchmarks (GPQA Diamond, SWE-Bench Verified, MMMU). gpt-oss-20b shipped 31 days before Kimi K2 (0905), 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 — at least one of these models has not published scores on GPQA Diamond, SWE-Bench Verified, or MMMU.