OpenAI posts 722 AI math proofs, 42% machine-checked

On October 6, 2026, OpenAI published the openai/math repository on GitHub with 722 manuscripts grouped into 372 result families, each using an average of three hours of ChatGPT Pro thinking compute. Three manuscripts were withdrawn the next day over a sign error, and the claimed 42% Lean formalization rate is disputed, with independent recounts landing at 24% or 36%.

• openai/math repository holds 722 manuscripts in 372 result families
• Three manuscripts withdrawn on October 7 over a sign error, 719 remain
• README claims 42% formalized in Lean; independent counts give 24% and 36%
• The model behind the proofs is not publicly available