Anthropic cuts off Fable 5 and Mythos 5 access following government order

Anthropic has fully blocked access to its Fable 5 and Mythos 5 models for all foreign nations and even its own employees, following a government order citing national security concerns. The company complied but noted the government did not provide specific details of the threat, only verbal claims of minor jailbreak vulnerabilities. Anthropic expressed that the alleged risks were already present in other models.