0 vs 2 benchmarks won
Anthropic Claude 3 Opus | Moonshot AI Kimi K2 | |
|---|---|---|
| Overview | ||
| Company | Anthropic | Moonshot AI |
| Release date | Mar 4 2024 | Jul 11 2025 |
| Model type | — | — |
| Open source | No | Yes |
| Specifications | ||
Parameters | — | 1T |
Context window | — | 128k |
| Benchmarks | ||
Science reasoning GPQA Diamond | 50.4% | 75.1% |
Software engineering SWE-Bench Verified | 33% | 65.8% |
Multimodal understanding MMMU | — | — |
| Timeline | ||
| Release gap | Claude 3 Opus shipped 494 days before Kimi K2 | |
Kimi K2 leads Claude 3 Opus on 2 of the tracked benchmarks (GPQA Diamond, SWE-Bench Verified, MMMU). Claude 3 Opus shipped 494 days before Kimi K2, so benchmark comparisons should account for the intervening progress.
Kimi K2 is an open-source / open-weight model; Claude 3 Opus is proprietary.
On GPQA Diamond, Kimi K2 scores 75.1%, 24.7 points above Claude 3 Opus at 50.4%. On SWE-Bench Verified, Kimi K2 scores 65.8%, 32.8 points above Claude 3 Opus at 33%.