Claude Opus 4 vs Kimi-Dev
Anthropic Claude Opus 4 | Moonshot AI Kimi-Dev | |
|---|---|---|
| Overview | ||
| Company | Anthropic | Moonshot AI |
| Release date | May 22 2025 | Jun 2025 |
| Access | Proprietary | Open Weight |
| Specifications | ||
Parameters | — | 72B |
| 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. | 34% | — |
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. | 72.5% | — |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 79.6% | — |
| Timeline | ||
| Release gap | Claude Opus 4 shipped 10 days before Kimi-Dev | |
Which is better: Claude Opus 4 or Kimi-Dev?
Claude Opus 4 and Kimi-Dev don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Claude Opus 4 shipped 10 days before Kimi-Dev, so benchmark comparisons should account for the intervening progress.
Claude Opus 4 is proprietary, while Kimi-Dev is open weight.
Direct benchmark comparisons are unavailable — Claude Opus 4 and Kimi-Dev don't publish scores on any of the same benchmarks.
Frequently asked questions
Claude Opus 4 was released by Anthropic on May 22 2025.
Kimi-Dev was released by Moonshot AI on Jun 2025.
Claude Opus 4 is a proprietary model released by Anthropic. Kimi-Dev is an open weight model released by Moonshot AI.
Other comparisons
Claude Opus 4 vs GPT-5.6 SolKimi-Dev vs GPT-5.6 SolClaude Opus 4 vs Gemini OmniKimi-Dev vs Gemini OmniClaude Opus 4 vs Muse Spark 1.1Kimi-Dev vs Muse Spark 1.1Claude Opus 4 vs Grok 4.5Kimi-Dev vs Grok 4.5Claude Opus 4 vs DeepSeek-V4-ProKimi-Dev vs DeepSeek-V4-ProClaude Opus 4 vs Mistral Medium 3.5Kimi-Dev vs Mistral Medium 3.5