Mistral AI Releases Leanstral 1.5: An Apache-2.0 Lean 4 Code Agent Model Solving 587 of 672 PutnamBench Problems

Short summary

Mistral AI released Leanstral 1.5, an open-source 119B mixture-of-experts code agent for Lean 4, achieving 587 of 672 solutions on PutnamBench benchmarks. The model activates 6.5B parameters per token and is available under Apache 2.0 license. Benchmarks and case studies available in full post.

• •119B MoE model activates 6.5B parameters per token for Lean 4 formal verification
• •Solves 587/672 PutnamBench problems and saturates miniF2F benchmarks
• •Apache 2.0 license; full architecture and case studies published

Generated with AI, which can make mistakes.