Devstral Small 2 (24B) vs GPT-5-Codex
Mistral Devstral Small 2 (24B) | OpenAI GPT-5-Codex | |
|---|---|---|
| Overview | ||
| Company | Mistral | OpenAI |
| Release date | Dec 9 2025 | Sep 15 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. | — | 39% |
| Timeline | ||
| Release gap | GPT-5-Codex shipped 85 days before Devstral Small 2 (24B) | |
Which is better: Devstral Small 2 (24B) or GPT-5-Codex?
Devstral Small 2 (24B) and GPT-5-Codex don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. GPT-5-Codex shipped 85 days before Devstral Small 2 (24B), so benchmark comparisons should account for the intervening progress.
Devstral Small 2 (24B) is open weight, while GPT-5-Codex is proprietary.
Direct benchmark comparisons are unavailable — Devstral Small 2 (24B) and GPT-5-Codex don't publish scores on any of the same benchmarks.
Frequently asked questions
Devstral Small 2 (24B) was released by Mistral on Dec 9 2025.
GPT-5-Codex was released by OpenAI on Sep 15 2025.
Devstral Small 2 (24B) is an open weight model released by Mistral. GPT-5-Codex is a proprietary model released by OpenAI.
Other comparisons
Devstral Small 2 (24B) vs Claude Sonnet 5GPT-5-Codex vs Claude Sonnet 5Devstral Small 2 (24B) vs Gemini OmniGPT-5-Codex vs Gemini OmniDevstral Small 2 (24B) vs Muse Spark 1.1GPT-5-Codex vs Muse Spark 1.1Devstral Small 2 (24B) vs Grok 4.5GPT-5-Codex vs Grok 4.5Devstral Small 2 (24B) vs DeepSeek-V4-ProGPT-5-Codex vs DeepSeek-V4-ProDevstral Small 2 (24B) vs Kimi K2.7 CodeGPT-5-Codex vs Kimi K2.7 Code