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Claude Fable 5 and Claude Mythos 5 \ Anthropic

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Today we’re launching Claude Fable 5: a Mythos-class model that we’ve made safe for general use.

Announcements Claude Fable 5 and Claude Mythos 5 Jun 9, 2026 Update Claude Mythos 5 and Fable 5 access unavailable Jun 12, 2026 We are suspending access to Claude Fable 5 and Claude Mythos 5. We apologize for this disruption to our customers and are working to restore access as soon as possible. Read more Today we’re launching Claude Fable 5 : a Mythos-class 1 model that we’ve made safe for general use. Fable 5’s capabilities exceed those of any model we’ve ever made generally available. It is state-of-the-art on nearly all tested benchmarks of AI capability, showing exceptional performance in

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