Devstral 2 is a state-of-the-art, open-weight agentic coding model developed by Mistral AI. Released in December 2025, it features a dense Transformer architecture with 123 billion parameters and a 256k token context window. Designed specifically for software engineering tasks, Devstral 2 excels at codebase exploration, multi-file editing, and complex instruction following. It supports multimodal inputs (text, code, and images) and is optimized for agentic workflows, achieving a score of 72.2% on the SWE-bench Verified benchmark. The model is released alongside the Mistral Vibe CLI for terminal-based code automation. While the weights are publicly available, the 123B model is distributed under a Modified MIT license with commercial restrictions for large entities.
Typemultimodal
Parameters123B