cs.stanford.edu/~knuth/papers/claude-cycles.pdf

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Claude’s Cycles Don Knuth, Stanford Computer Science Department (28 February 2026; revised 14 April 2026) Shock! Shock! I learned yesterday that an open problem I’d been working on for several weeks had just been solved by Claude Opus 4.6 — Anthropic’s hybrid reasoning model that had been released three weeks earlier! It seems that I’ll have to revise my opinions about “generative AI” one of these days. What a joy it is to learn not only that my conjecture has a nice solution but also to celebrate this dramatic advance in automatic…

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