Simon Willison 12/10/2025

Devstral 2

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Mistral AI announces Devstral 2, a 123B parameter state-of-the-art open model for code agents, achieving 72.2% on SWE-bench and claiming up to 7x cost efficiency vs. competitors, and Devstral Small 2, a 24B model. The article details their licensing (a modified MIT for the larger model, Apache 2 for the small) and includes initial testing results for code generation tasks.

Devstral 2

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