The U.S. government issued export control directives, suspending access for foreign nationals to Anthropic Fable 5 and Mythos 5

According to an official statement from Anthropic, on June 11 local time, the U.S. government issued an export control directive citing national security, requiring the suspension of access to Fable 5 and Mythos 5 for all foreign nationals. Anthropic was forced to shut down the aforementioned two models for all users.

The government believes it has discovered a "jailbreak" method to bypass the protective mechanisms of Fable 5, but Anthropic, after review, pointed out that the related vulnerability is relatively minor and that similar capabilities exist in other publicly available models such as OpenAI GPT-5.5, which does not constitute an exclusive risk to Mythos.

Anthropic stated that it will comply with the government directive but clearly opposes taking down commercial models that have been deployed to hundreds of millions of users based on the discovery of a single narrow-range jailbreak. They warned that if this standard is widely applied in the industry, it would effectively block all new deployments of cutting-edge models. The company is currently actively communicating with the government to restore access as soon as possible.