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Leanstral 1.5 Lean code agent release
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Mistral AI released Leanstral 1.5, an open-source Lean 4 code agent model under Apache 2.0 license that solves 587 of 672 PutnamBench problems and saturates the miniF2F benchmark. The 119B mixture-of-experts model activates 6.5B parameters per token and demonstrates capability in formal proof generation and bug-finding.
- Solves 587 of 672 PutnamBench problems, saturates miniF2F benchmark
- 119B mixture-of-experts architecture with 6.5B active parameters per token
- Apache 2.0 licensed, free and open-source for Lean 4
- Demonstrates real-world bug-finding capabilities in case studies
- Designed as code agent for formal proof generation