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Anthropic Releases Claude Fable 5 and Mythos 5 as xAI's Grok 4.5 Escalates Frontier AI Rivalry

  • Foundation Models

Anthropic has launched Claude Fable 5 and Claude Mythos 5, two models built on the same foundation but split by how much safety tooling stands between users and the system's raw capabilities, intensifying a head-to-head contest with xAI's faster, cheaper Grok line.

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