On June 13, Anthropic issued a statement announcing that the U.S. government, citing national security powers, has released an export control directive requiring the suspension of all access to the AI models Fable 5 and Mythos 5 by foreign entities, regardless of whether the individuals are within the U.S., including Anthropic employees who are foreign nationals. The practical effect of this order is that we must immediately disable access to Fable 5 and Mythos 5 for all customers to ensure compliance. Access to all other Anthropic models will not be affected. We received the government's directive at 5:21 PM (Eastern Time) today. The letter did not specify the details of its national security concerns. Our understanding is that the government believes it has become aware of a method to bypass or 'jailbreak' Fable 5. So far, the government has only provided us with verbal evidence suggesting the existence of a potential narrow, non-general jailbreak, essentially by requiring the model to read specific code libraries and fix any software defects. We are complying with the government's legitimate directive and are in the process of removing all users' access to Fable 5 and Mythos 5. However, we disagree with the conclusion that 'a narrow potential jailbreak vulnerability should be the reason to recall commercial models deployed to hundreds of millions of users.' (Jinshi)