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3Blue1Brown
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Grant Sanderson
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29 slides
51:55
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3Blue1Brown
· Sep 18, 2026
The last IMO problem AI could not solve
Grant Sanderson · 3Blue1Brown
Grant Sanderson walks through IMO 2025 Problem 6 — a tiling puzzle that frontier models missed — and the visual patience it takes to prove a construction is optimal.
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Reasoning & test-time compute
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