AnalysisScienceJuly 23, 2026

Claude Fable 5 cracks 87-year-old Jacobian Conjecture

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Anthropic researcher Levent Alpöge used Claude Fable 5 to identify a hand-checkable counterexample to the Jacobian Conjecture, open since 1939; it was quickly empirically validated. The problem ranks as Smale's #16 challenge for the 21st century, and full peer review is still pending.

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