OpenAI publishes 722 mathematics manuscripts from an unreleased frontier model
OpenAI released 722 manuscripts across 372 math result families with 162 Lean formalizations — but withheld the model name and prompts an advisory group had asked for.
Mistral opens Leanstral 1.5: 6B-active Apache-2.0 Lean 4 prover
Apache-2.0 Leanstral 1.5 (119B/6B MoE) saturates miniF2F, hits 587/672 PutnamBench, sets SOTA on FATE-H and FATE-X, and finds 5 unknown bugs in 57 Rust repos — at ~$4 per problem.