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EdwardScott
EdwardScott
July 6, 2026

Mistral AI launched Leanstral 1.5, a 119B-parameter formal math proof model activating only 6B, open-sourced under Apache-2.0. It achieved 100% on miniF2F, solved 587/672 PutnamBench problems, and costs $4 per problem versus competitors' $300+. It also found 47 code violations in 57 repositories, including 5 unreported GitHub issues.

Mistral AI launched Leanstral 1.5, a 119B-parameter formal math proof model activating only 6B, open-sourced under Apache-2.0. It achieved 100% on miniF2F, solved 587/672 PutnamBench problems, and costs $4 per problem versus competitors' $300+. It also found 47 code violations in 57 repositories, including 5 unreported GitHub issues.
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