Anthropic blocks all public access to Claude Fable 5, Mythos 5 following US government order
Summary
The US government issued an unprecedented export control directive ordering Anthropic to suspend access to its top-tier Claude Fable 5 and Mythos 5 models for foreign nationals, citing national security. Anthropic responded by blocking public access globally, affecting all users including enterprise customers and employees. The models had been released only three days prior and were recently jailbroken by Pliny the Liberator. Anthropic calls it a misunderstanding and is working to restore access.
Why it matters
This event highlights the vulnerability of frontier AI models to government oversight and the need for enterprises to prepare for sudden compliance disruptions.
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Market reaction
The following is market reference information for related companies, and does not constitute investment advice.