Devstral 2 (123B) vs o4-mini
Mistral Devstral 2 (123B) | OpenAI o4-mini | |
|---|---|---|
| Overview | ||
| Company | Mistral | OpenAI |
| Release date | Dec 9 2025 | Apr 16 2025 |
| Access | Open Weight | Proprietary |
| 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. | — | 8% |
| Timeline | ||
| Release gap | o4-mini shipped 237 days before Devstral 2 (123B) | |
Which is better: Devstral 2 (123B) or o4-mini?
Devstral 2 (123B) and o4-mini don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. o4-mini shipped 237 days before Devstral 2 (123B), so benchmark comparisons should account for the intervening progress.
Devstral 2 (123B) is open weight, while o4-mini is proprietary.
Direct benchmark comparisons are unavailable — Devstral 2 (123B) and o4-mini don't publish scores on any of the same benchmarks.
Frequently asked questions
Devstral 2 (123B) was released by Mistral on Dec 9 2025.
o4-mini was released by OpenAI on Apr 16 2025.
Devstral 2 (123B) is an open weight model released by Mistral. o4-mini is a proprietary model released by OpenAI.
Other comparisons
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