Gemini 2.5 Pro vs Devstral 2 (123B)
Google Gemini 2.5 Pro | Mistral Devstral 2 (123B) | |
|---|---|---|
| Overview | ||
| Company | Mistral | |
| Release date | Mar 25 2025 | Dec 9 2025 |
| Access | Proprietary | Open Weight |
| 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. | 20% | — |
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. | 59.6% | — |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 86.4% | — |
Multimodal MMMUTests the AI on understanding images and text together across many college subjects. Higher is better. | 68% | — |
| Timeline | ||
| Release gap | Gemini 2.5 Pro shipped 259 days before Devstral 2 (123B) | |
Which is better: Gemini 2.5 Pro or Devstral 2 (123B)?
Gemini 2.5 Pro and Devstral 2 (123B) don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Gemini 2.5 Pro shipped 259 days before Devstral 2 (123B), so benchmark comparisons should account for the intervening progress.
Gemini 2.5 Pro is proprietary, while Devstral 2 (123B) is open weight.
Direct benchmark comparisons are unavailable — Gemini 2.5 Pro and Devstral 2 (123B) don't publish scores on any of the same benchmarks.
Frequently asked questions
Gemini 2.5 Pro was released by Google on Mar 25 2025.
Devstral 2 (123B) was released by Mistral on Dec 9 2025.
Gemini 2.5 Pro is a proprietary model released by Google. Devstral 2 (123B) is an open weight model released by Mistral.
Other comparisons
Gemini 2.5 Pro vs Claude Sonnet 5Devstral 2 (123B) vs Claude Sonnet 5Gemini 2.5 Pro vs GPT-5.6 SolDevstral 2 (123B) vs GPT-5.6 SolGemini 2.5 Pro vs Muse Spark 1.1Devstral 2 (123B) vs Muse Spark 1.1Gemini 2.5 Pro vs Grok 4.5Devstral 2 (123B) vs Grok 4.5Gemini 2.5 Pro vs DeepSeek-V4-ProDevstral 2 (123B) vs DeepSeek-V4-ProGemini 2.5 Pro vs Kimi K2.7 CodeDevstral 2 (123B) vs Kimi K2.7 Code