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Channel
3Blue1Brown
Topic
Reasoning & test-time compute
Length
Over 30 min
29 slides
51:55
EN
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.
Mathematics
AI research
Reasoning & test-time compute
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