government-regulation

Anthropic disabled all customer access to its Fable 5 and Mythos 5 AI models on June 12, 2026, following a US government order citing national security concerns. The government mandated suspension of access for all foreign nationals, including Anthropic employees, based on evidence of a potential jailbreak method for Fable 5.

The U.S. government ordered Anthropic to immediately shut down access to Claude Fable 5 and Claude Mythos 5 on Friday, citing national security concerns. Anthropic received the directive at 5:21 pm ET and has complied, disabling both models worldwide, but says the government received only verbal evidence of a 'potential narrow, non-universal jailbreak.'

The US government has ordered Anthropic to immediately suspend access to its Fable 5 and Mythos 5 models for all users, citing national security concerns over an alleged jailbreak technique. Anthropic states the directive, received at 5:21pm ET, provided no specific details beyond a claimed bypass method that other publicly-available models can already perform.

Anthropic disabled its Fable 5 and Mythos 5 AI models on Friday after receiving a U.S. government export control order at 5:21 p.m. ET. The directive, citing national security authorities, instructed the company to suspend all access by foreign nationals, including its own employees.