Claude 3.7 Sonnet vs Kimi K2 (0905)
Anthropic Claude 3.7 Sonnet | Moonshot AI Kimi K2 (0905) | |
|---|---|---|
| Overview | ||
| Company | Anthropic | Moonshot AI |
| Release date | Feb 24 2025 | Sep 5 2025 |
| Access | Proprietary | Open Weight |
| Specifications | ||
Parameters | — | 1T |
Context window | — | 256k |
| Benchmarks | ||
Nonsense detection BullshitBench v2Given a confidently-worded but nonsensical prompt, does the AI spot that it makes no sense and push back — instead of playing along and inventing an answer? The score is how often it clearly called out the nonsense. Higher is better. | 49% | — |
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. | 62.3% | 65.8%Best |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 68% | 75.1%Best |
| Timeline | ||
| Release gap | Claude 3.7 Sonnet shipped 193 days before Kimi K2 (0905) | |
Which is better: Claude 3.7 Sonnet or Kimi K2 (0905)?
Kimi K2 (0905) leads Claude 3.7 Sonnet on 2 of the 2 benchmarks they both report (SWE-Bench Verified, GPQA Diamond). Claude 3.7 Sonnet shipped 193 days before Kimi K2 (0905), so benchmark comparisons should account for the intervening progress.
Claude 3.7 Sonnet is proprietary, while Kimi K2 (0905) is open weight.
On SWE-Bench Verified, Kimi K2 (0905) leads at 65.8% vs Claude 3.7 Sonnet at 62.3%. On GPQA Diamond, Kimi K2 (0905) leads at 75.1% vs Claude 3.7 Sonnet at 68%.
Frequently asked questions
Claude 3.7 Sonnet was released by Anthropic on Feb 24 2025.
Kimi K2 (0905) was released by Moonshot AI on Sep 5 2025.
Kimi K2 (0905) leads on SWE-Bench Verified — Claude 3.7 Sonnet 62.3% vs Kimi K2 (0905) 65.8%.
Kimi K2 (0905) leads on GPQA Diamond — Claude 3.7 Sonnet 68% vs Kimi K2 (0905) 75.1%.
Claude 3.7 Sonnet is a proprietary model released by Anthropic. Kimi K2 (0905) is an open weight model released by Moonshot AI.