Devstral 2
Mistral's SOTA open-weight coding model — 72.2% SWE-bench, free API
0About Devstral 2
Mistral AI's next-generation open-weight coding model family, released December 9, 2025. Devstral 2 is a 123B-parameter dense transformer with a 256K context window, achieving 72.2% on SWE-bench Verified under a modified MIT license — currently free via the Mistral API. Devstral Small 2 (24B, Apache 2.0) scores 68.0% on SWE-bench Verified and runs on consumer hardware. Up to 7× more cost-efficient than Claude Sonnet at real-world coding tasks per Mistral's human evaluations. Ships alongside Mistral Vibe, an open-source terminal CLI for end-to-end code automation.
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Key Features
Devstral 2 Pros & Cons
✅ Pros
- +72.2% on SWE-bench Verified makes it the best open-weight coding model at launch — no closed-source license required
- +Free API access lowers the bar significantly; most teams can evaluate without a budget discussion
- +Devstral Small 2 (24B, Apache 2.0) runs on consumer hardware, making local deployment practical
- +Mistral Vibe CLI provides a ready-made agentic coding interface — no third-party agent framework required
- +7× cost efficiency vs. Claude Sonnet means the economics work at high token volumes
- +Permissive licenses (MIT/Apache 2.0) allow commercial use without royalties or usage restrictions
⚠️ Cons
- −Claude Sonnet 4.5 is still significantly preferred in human evals — gap with frontier closed-source models persists
- −Mistral Vibe CLI is new and early; tooling maturity lags behind Copilot and Cursor
- −Benchmark comparisons (SWE-bench %) are self-reported by Mistral; independent reproduction pending at launch
- −Fine-tuning and enterprise on-prem deployment require reaching out to Mistral directly
Who Is Devstral 2 Best For?
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