GPT-6 Astra solves the last FrontierMath Tier 4 problem, clearing the whole tier
NathanpmYoung · x · 2026-09-11
Epoch AI reports that every FrontierMath Tier 4 problem has now been solved by AI, with GPT-6 Astra cracking the last one standing — a problem authored by mathematician Jay Pantone. Notably, mathematicians had often observed AI finding unintended shortcuts on Tier 4 problems, but not on this final one.
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