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Looking ahead: Anthropic has released Claude Fable 5.1, making its newest flagship model available through its API, cloud platforms and the Claude desktop app. It also released Mythos 5.1, a version of the same underlying model reserved for approved cybersecurity and life-sciences organizations. These updates make Anthropic's most advanced models easier for companies to use on complex work that takes time, involves sensitive data and needs clear safeguards.
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 access is limited to Anthropic's trusted-access program.
The update targets customers using AI for assignments larger than a single prompt or code request. Anthropic said Fable 5.1 is better at handling software projects, reviewing code across an application, troubleshooting problems in external libraries and running multistep scientific work. It can also help design experiments, model possible outcomes and interpret detailed tables and diagrams.
