Anthropic released Claude Fable 5.2 to all users on November 9, 2026, with classifiers that block high-risk cyber activities and most research biology tasks. Direct access to Mythos 5.2, the same model with more permissive safeguards, is limited to vetted users. Customers not eligible to keep zero data retention get 30-day retention for safety monitoring.
Dario Amodei, Anthropic's chief executive, at TechCrunch Disrupt on September 20, 2023. Archive photograph by Kimberly White/Getty Images for TechCrunch; Anthropic announced the Claude Fable 5.2 release and Mythos 5.2 access limits on November 9, 2026. Kimberly White/Getty Images for TechCrunch / Wikimedia Commons · CC BY 2.0
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