Anthropic Splits Claude Into Two Models: Fable 5.1 for General Use, Mythos 5.1 for Research

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Anthropic has released two new AI models — Claude Fable 5.1 and Mythos 5.1 — built on the same underlying architecture but designed for different use cases and risk profiles. Fable 5.1 serves as the new general-purpose flagship for developers, offering improved performance in coding and complex problem-solving at roughly 25% lower cost than its predecessor. Mythos 5.1, by contrast, is restricted to vetted organizations and targets high-stakes research in sensitive domains such as cybersecurity and biology. The split reflects a deliberate strategy to move away from one-size-fits-all safety controls, with Fable 5.1 featuring more precise safeguards that reportedly reduce false interventions on benign biology-related queries by 85%. Anthropic's tiered approach signals a broader industry trend of separating powerful general-purpose models from specialized, access-controlled variants as AI capabilities grow.

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