Leanstral 1.5: Proof Abundance for Everyone

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ME AI message, Mistral AI today released Leanstral 1.5, an Apache-2.0 licensed open-source formal verification model with 119B total parameters and only 6B active. Achieved 100% saturation on miniF2F, solved 587/672 problems on PutnamBench, and set new SOTA on FATE-H (87%) and FATE-X (34%). Training involved mid-training, SFT, and reinforcement learning based on CISPO. Has agent-style proof capabilities, discovered 5 unknown bugs in 57 open-source repositories. The model is now publicly available via HuggingFace and a free API.
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