DeepSeek V3.1 vs Kimi K2
DeepSeek DeepSeek V3.1 | Moonshot AI Kimi K2 | |
|---|---|---|
| Overview | ||
| Company | DeepSeek | Moonshot AI |
| Release date | Aug 21 2025 | Jul 11 2025 |
| Access | Open Weight | Open Weight |
| Specifications | ||
Parameters | — | 1T |
Context window | — | 128k |
| 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. | — | 10% |
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. | — | 65.8% |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | — | 75.1% |
| Timeline | ||
| Release gap | Kimi K2 shipped 41 days before DeepSeek V3.1 | |
Which is better: DeepSeek V3.1 or Kimi K2?
DeepSeek V3.1 and Kimi K2 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Kimi K2 shipped 41 days before DeepSeek V3.1, 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 — DeepSeek V3.1 and Kimi K2 don't publish scores on any of the same benchmarks.
Frequently asked questions
DeepSeek V3.1 was released by DeepSeek on Aug 21 2025.
Kimi K2 was released by Moonshot AI on Jul 11 2025.
Other comparisons
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