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System Card: Claude Fable 5 and Claude Mythos 5 [pdf]

Hacker News · Jun 9, 2026, 4:58 PM · Also reported by 4 other sources

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LessWrong Claude Fable 5 and Mythos 5 [Linkpost] The Verge Anthropic releases its first Mythos-class model Claude Fable TechCrunch AI Anthropic’s Claude Fable is a version of Mythos the public can access today Decrypt Anthropic Rolls Out Claude Mythos 5 AI Model—Along With the Safer Fable 5 for the Public

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