Epoch Confirms GPT-5.4 Pro Solved a FrontierMath Open Problem — First AI to Crack Unsolved Math

Epoch AI·high signal

Epoch AI confirmed GPT-5.4 Pro solved the first problem in FrontierMath's Open Problems tier, scoring 50% on Tiers 1-3 and 38% on Tier 4 — a new record. The model appears to have found a 2011 preprint that shortcut much of the intended work, raising questions about whether this constitutes genuine mathematical reasoning or sophisticated retrieval. The 422-point, 615-comment HN thread is the most intensely debated AI story of the day.