OpenAI Astra is OpenAI's next model family and remains unreleased as of October 12, 2026, with no date or confirmed version name.
The ten August proofs are public Lean 4 files; we measured about 548,000 lines, zero sorry placeholders and only the three standard axioms.
On October 6 OpenAI released 719 manuscripts in 372 families, about 42% of top-line results formalized, then withdrew three papers on October 7 after a sign error.
Lean confirms logic, not attribution or peer review; a credit dispute over the sphere-packing proof remains open.