us-government

Anthropic has launched Claude Sonnet 5 and restored access to its Fable and Mythos frontier models after an 18-day operational pause. The suspension began June 12 following a US government export control directive targeting the company's highest-capability systems.

The US Commerce Department has partially lifted export controls on Anthropic's Claude Mythos 5 model, permitting its release to over 100 US institutions including major companies and government agencies. The restrictions, imposed two weeks ago alongside a block on Claude Fable 5, reportedly stemmed from concerns about potential jailbreaks and Chinese access.

The US government imposed export controls on Anthropic's newly released Claude Fable 5 and underlying Mythos models on Friday, restricting access even for foreign nationals working at Anthropic in the United States. Anthropic took both models completely offline rather than risk non-compliance, leaving Fable unavailable to all users as of this writing.