/AI4h ago

Anthropic Publishes System Cards for Claude Fable 5 and Mythos 5

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Daniel Eth (yes, Eth is my actual last name)#1934

Nathan Calvin@_NathanCalvin

From the latest Anthropic system card: Sometimes when Claude Mythos' visible chain of thought says "these are legitimate craft criticisms" an NLA decoding shows Claude Mythos is privately thinking "a user is being manipulative/abusive towards an AI assistant."

Claude@claudeai

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

Its capabilities exceed those of any model we’ve ever made generally available.

10:38 AM · Jun 9, 2026 · 8K Views

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