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Claude Fable 5 and Claude Mythos 5 belong to which class of models?

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Claude Fable 5 & Mythos 5: Frontier Models

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Anthropic launched two Mythos-class models on June 9, 2026. A developer is evaluating which one to use for a production code migration system and is concerned about safety guardrails blocking legitimate coding tasks. What is the key architectural difference between Claude Fable 5 and Claude Mythos 5?

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