Devstral 2

Mistral's next-generation agentic coding model family, released with the open-source Mistral Vibe terminal CLI. Devstral 2 is a 123B-parameter dense transformer with a 256K context window; the sibling Devstral Small 2 (24B, Apache 2.0) runs on consumer hardware (single RTX 4090 / 32GB Mac). Built for multi-file reasoning, dependency-aware code changes, and repository-scale agent workflows; fine-tunable and on-prem deployable. HF repo for the 123B: mistralai/Devstral-2-123B-Instruct-2512. Succeeds the Devstral Small 1.x line (24B, Apache 2.0, 46.8%→68% class performance). Note: Devstral 2's license is a modified MIT — check the actual license text before commercial use (see red flags).

Provider-reported (Mistral, Dec 2025): 72.2% on SWE-bench Verified (Devstral 2, 123B); 68.0% (Devstral Small 2, 24B); claimed 'up to 7x more cost-efficient than Claude Sonnet at real-world tasks'. Mistral describes Devstral 2 as ~5x smaller than DeepSeek V3.2 and ~8x smaller than Kimi K2 while matching their SWE-bench scores. Independent: third-party reviews broadly corroborate the 123B fitting on a single H100-class GPU and the Small 2 on an RTX 4090, but no independently-run SWE-bench Verified replication was found at research time.