TestingCatalog and AI News Live report that Anthropic has begun small-scale testing of a successor believed to be Fable 5.1, with some users routed to it while Fable 5 remains selected. Some users have also noticed updated knowledge cutoffs for Fable 5, pointing to a stealth rollout.
anthropic
Anthropic tests a possible Fable 5.1 rollout
Claude News
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