Leanstral 1.5
Leanstral 1.5 is a free, open-source large language model developed by mistral-ai, specifically optimized for generating formal proofs in Lean 4. Released as part of the Leanstral series, it addresses the complexity of formal verification by leveraging specialized training on mathematical proofs and code correctness.
Key Specifications & Features
- Model Architecture: 119B parameters with 6B active parameters (MoE architecture), designated as Leanstral 1.5 119B A6B.
- Primary Function: Automated theorem proving and code correctness verification within the Lean 4 ecosystem.
- Accessibility: Fully open-source and free to use, distinguishing it from proprietary formal verification assistants.
- Performance: Designed to handle complex proof steps that general-purpose LLMs often struggle with, reducing the manual effort required for formal verification.
Context & Significance
Leanstral 1.5 represents a significant advancement in AI-assisted formal methods. By focusing exclusively on Lean 4, the model achieves higher accuracy in proof generation compared to generalist models. This facilitates more rigorous software verification and mathematical discovery workflows.