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Claude Fable 5 and Mythos 5 Released: Anthropic's new models explained
Anthropic has released Claude Fable 5 for general use and Claude Mythos 5 for vetted high-risk research partners. They share the same underlying Mythos-class model, but differ in safeguards, access and risk handling.

By Jason FutrillJun 10, 2026 · 7 min read










