Leanstral 1.5: Proof Abundance for All
Summary
Mistral AI has released Leanstral 1.5, a free and open source model that significantly improves formal verification and mathematical proof performance.
Key Points
- This is a Lean 4 official verification model based on the Apache-2.0 license with 6B active parameters out of a total of 119B parameters.
- It was trained in a multi-round environment and code agent environment through intermediate training, supervised fine tuning, and reinforcement learning using CISPO.
- By performing verification on an actual open source repository, we found five previously undetected errors and proved its practicality.
Notable Quotes & Details
Notable Data / Quotes
- 119B total
- 6B active parameters
- 587/672 PutnamBench
- 87% on FATE-H
- 34% on FATE-X
- 5 previously unknown bugs
- 57 repositories
Intended Audience
AI researchers and software developers interested in formal verification, mathematical proofs, and software stability verification