Simon Willison 3/17/2026

Introducing Mistral Small 4

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Mistral AI introduces Mistral Small 4, a new Apache 2 licensed 119B parameter model. It unifies the capabilities of their flagship models for reasoning, multimodal tasks, and agentic coding into a single versatile model. The article also mentions the release of Leanstral, a model tuned for the Lean 4 formally verifiable coding language, and includes initial testing notes via the Mistral API.

Introducing Mistral Small 4

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