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Anthropic launches Claude Fable 5.1 and restricted Mythos 5.1 for advanced research
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Fusion42 · 4 September 2026 · Fusion42 review
Anthropic has launched Claude Fable 5.1 as a generally available AI model, while restricting Claude Mythos 5.1 to vetted cybersecurity and life sciences researchers due to its advanced capabilities. The new models improve cost efficiency and performance in scientific applications like protein design and planetary mapping, with tighter access controls on higher-risk functionalities.
This Wire brief sits within Fusion42's coverage of AI & ML.
◆ ◆ The Wire takeaway
Anthropic's split model release creates a new permission boundary that you must navigate if your research requires advanced AI. You can use Claude Fable 5.1 broadly but must secure Cyber or Life Sciences Verification to unlock Mythos 5.1’s powerful biological and security features.
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1 source · 4 Sep 2026
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