Anthropic suspends access to Fable 5, Mythos 5, citing US directive

Anthropic has abruptly disabled its flagship AI models after a US government directive citing national security concerns. Anthropic has suspended access to its Fable 5 and Mythos 5 AI models after receiving a US government export control directive citing national security concerns. In a statement posted Friday, Anthropic [said](https://www.anthropic.com/news/fable-mythos-access) it received the directive at 5:21 pm ET, instructing it to suspend all access to Fable 5 and Mythos 5 by any foreign national, whether inside or outside the United States, including foreign national Anthropic employees. Anthropic abruptly disabled the models for all users in order to ensure compliance. It said its other models, such as Opus 4.8, are not affected. The directive comes just days after Anthropic [released Fable 5 and Mythos 5](https://cointelegraph.com/news/anthropic-releases-claude-mythos-with-safeguards-crypto-users-wary), two [powerful AI models](https://cointelegraph.com/news/claude-mythos-finds-thousands-of-zero-day-os-and-browser-vulnerabilities) built on top of Mythos Preview, a general-purpose language model that the company previously [said had found](https://cointelegraph.com/news/claude-mythos-finds-thousands-of-zero-day-os-and-browser-vulnerabilities) thousands of vulnerabilities in critical software. Fable 5 was released on Tuesday to the general public with built-in safeguards aimed at preventing its misuse. Mythos 5 was released to approved cybersecurity partners only. Anthropic said the government did not provide specific details about the alleged threat, but said it believes authorities are concerned about a possible “jailbreak” method capable of bypassing the models’ safeguards. _**Related:**_[_**AI researcher claims he's already bypassed Anthropic's Fable 5 guardrails**_](https://cointelegraph.com/news/researcher-claims-hes-already-jailbroken-anthropics-guardrailed-claude-fable-5) However, Anthropic defended its model’s guardrails, maintaining that over thousands of hours of testing, a “universal jailbreak," no testers had found a method to broadly bypass the model’s safeguards.