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Anthropic releases Claude Fable 5.1, cuts cached token pricing by 75%


Fable 5.1 is the broadly available version, with safeguards that block some high-risk work in cybersecurity and scientific research. Mythos 5.1 has fewer of those restrictions, but...

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Anthropic launches Claude Fable 5.1 and says it’s up to 45 percent cheaper for agentic work

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Anthropic's Claude Fable 5.1 and Mythos 5.1 arrive with a 75% cost reduction for Fable cache reads