Anthropic’s Claude Fable 5.2 finishes a 23-year-old black hole calculation

The new model worked out that black holes form abruptly in very small universes, closing a physics problem left open since 2003 Anthropic ’s Claude Fable 5.2, formally announced on November 9, 2026, completed a black hole calculation that had gone unresolved for 23 years. The result: in very small universes, black holes don’t ease into existence. They appear suddenly. The breakthrough came during prerelease testing, before the model was publicly available. Fable 5.2 completed the calculation that began in 2003 and showed that black hole formation in tiny universes happens through a first-order phase transition. If that phrase sounds intimidating, picture a pot of water on the stove. Nothing visible happens for a while, then the water abruptly starts to boil.

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