Anthropic Launches Claude Fable 5.1 and Mythos 5.1: Same Model, Different Access Tiers

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Anthropic released two new AI models on September 1, 2026 — Claude Fable 5.1 for general users and Claude Mythos 5.1 for vetted organizations such as cybersecurity researchers and bioscientists. Both models share the same underlying architecture but differ in the level of safety guardrails applied, with Mythos offering near-fully unlocked capabilities including the ability to map exploit paths. Anthropic describes Mythos 5.1 as having the strongest cyber capabilities of any model it has released to date. On the cost side, users can expect savings of around 25% on typical workloads and up to 45% on agent-heavy tasks, thanks to improved prompt caching. The release highlights a broader industry debate between fully open AI models and controlled-access approaches, with Anthropic firmly backing the latter through its verified-access programs.

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