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Levent Alpöge says Claude Fable 5 found a Jacobian conjecture counterexample, forcing new scrutiny on AI-assisted proof.

A Harvard valedictorian used Claude to hit a 1939 breakthrough, but the missing “why” is the real problem.

Enterprises lose top-tier Claude access overnight, with fallback models auto-routing and an uncertain path to restoration.

A US order bars foreign users, and Anthropic says it will comply by turning off its latest frontier models globally.