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Leanstral 1.5

Mistral AI🇫🇷 France
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1.5minor

Leanstral 1.5 delivers major performance upgrades over the original Leanstral, saturating miniF2F at 100%, solving 587/672 PutnamBench problems, and achieving state-of-the-art results on FATE-H (87%) and FATE-X (34%) while reducing cost to $4 per problem versus $300+ for competitors.

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model releaseMistral AI

Mistral Releases Leanstral 1.5: 6B-Parameter Model Achieves 100% on miniF2F, Solves 587/672 PutnamBench Problems

Mistral AI released Leanstral 1.5, a free Apache-2.0 licensed model with 119B total parameters and 6B active parameters specialized for formal verification in Lean 4. The model achieves 100% on miniF2F benchmark, solves 587 of 672 PutnamBench problems at $4 per problem (versus $300+ for competitors), and reaches state-of-the-art 87% on FATE-H and 34% on FATE-X benchmarks.

3 min read
Mistral AILeanstralformal verification