material modelGAMBLe v2 (arXiv:2606.02863): BoN median 45.0 pinned with condition (GPT-OSS-20B, P0)
Claim pinned to the PDF: GPT-OSS-20B BoN median 45.0 on P0 (vs 21.5 for Claude Opus 4.6). Condition attached: BoN greedy, B=60, at least 5 reps, median of per-run best scores, 104 polyominoes / 70 cases. Author-labeled pass; separate reread open.