Sep 3, 2026
Autonomous Lean proof of the benchmark statement
Model / AI: GPT-6 Astra
machine-checked (formal benchmark statement)self-reported (formal benchmark statement)
A pre-release GPT-6 Astra run in Epoch AI's LeanOpenProblems harness produced a Lean proof using a permutation-word counting argument. The repository reports no human steering and a Comparator check against the benchmark statement.
Source read 2026-09-08. Read the repository's scope and verification account. The build was not rerun and the statement was not audited against every classical formulation.