Mistral's new agent proofs your code on the cheap
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Mistral has released Leanstral, a coding agent for formal code verification using the Lean programming language. Available with open weights (Apache 2.0) via Mistral Vibe and a free API endpoint, Leanstral aims to make AI-generated code more reliable by grounding agents in formal proofs, tests, and specifications. Mistral claims Leanstral-120B-A6B outperforms larger open source rivals on the FLTEval benchmark and offers competitive performance against Anthropic's Claude Sonnet at a fraction of the cost — $36 vs $549 for a pass@2 run. Mistral also released Mistral Small 4, an all-in-one model for reasoning, coding, and chat tasks.
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