Devstral 2 (123B) vs Kimi K2
Mistral Devstral 2 (123B) | Moonshot AI Kimi K2 | |
|---|---|---|
| Overview | ||
| Company | Mistral | Moonshot AI |
| Release date | Dec 9 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 151 days before Devstral 2 (123B) | |
Which is better: Devstral 2 (123B) or Kimi K2?
Devstral 2 (123B) 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 151 days before Devstral 2 (123B), 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 — Devstral 2 (123B) and Kimi K2 don't publish scores on any of the same benchmarks.
Frequently asked questions
Devstral 2 (123B) was released by Mistral on Dec 9 2025.
Kimi K2 was released by Moonshot AI on Jul 11 2025.
Other comparisons
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