Anthropic Confirms Fable 5 and Mythos 5 Offline to Comply With US Export Controls

Anthropic has taken its Fable 5 and Mythos 5 frontier AI models offline globally to comply with a U.S. Commerce Department export control action; the report outlines the company's voluntary compliance stance, the models and capabilities targeted, the scope of the shutdown, and the broader policy debate over treating frontier AI as controlled technology, while noting unaffected Claude 4 family models and potential paths for validated access.