Claude Opus 4.1 vs Kimi Linear
Anthropic Claude Opus 4.1 | Moonshot AI Kimi Linear | |
|---|---|---|
| Overview | ||
| Company | Anthropic | Moonshot AI |
| Release date | Aug 5 2025 | Oct 30 2025 |
| Access | Proprietary | Open Weight |
| Specifications | ||
Parameters | — | 48B |
| 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. | 43% | — |
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. | 74.5% | — |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 80.9% | — |
| Timeline | ||
| Release gap | Claude Opus 4.1 shipped 86 days before Kimi Linear | |
Which is better: Claude Opus 4.1 or Kimi Linear?
Claude Opus 4.1 and Kimi Linear don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Claude Opus 4.1 shipped 86 days before Kimi Linear, so benchmark comparisons should account for the intervening progress.
Claude Opus 4.1 is proprietary, while Kimi Linear is open weight.
Direct benchmark comparisons are unavailable — Claude Opus 4.1 and Kimi Linear don't publish scores on any of the same benchmarks.
Frequently asked questions
Claude Opus 4.1 was released by Anthropic on Aug 5 2025.
Kimi Linear was released by Moonshot AI on Oct 30 2025.
Claude Opus 4.1 is a proprietary model released by Anthropic. Kimi Linear is an open weight model released by Moonshot AI.
Other comparisons
Claude Opus 4.1 vs GPT-5.6 SolKimi Linear vs GPT-5.6 SolClaude Opus 4.1 vs Gemini 3.5 FlashKimi Linear vs Gemini 3.5 FlashClaude Opus 4.1 vs Muse Spark 1.1Kimi Linear vs Muse Spark 1.1Claude Opus 4.1 vs Grok 4.5Kimi Linear vs Grok 4.5Claude Opus 4.1 vs DeepSeek-V4-ProKimi Linear vs DeepSeek-V4-ProClaude Opus 4.1 vs Mistral Medium 3.5Kimi Linear vs Mistral Medium 3.5