Roger Oriol

Just 3 days after the release of Claude Fable 5 and Mythos 5, Anthropic was forced to suspend access to them by the US Commerce Department. According to the government, a third party reported to them a method of jailbreaking Anthropic's safeguards. The Commerce Department asked Anthropic to suspend access to Fable and Mythos of all people foreign to the United States, including all foreign people based on the United States and also including people working at Anthropic.

Anthropic probably doesn't currently have a way for people to prove their citizenship, therefore it completely cut access to those models for everyone.

According to Anthropic the jailbreak is narrow and non-universal. Anthropic also believes that the jailbreaked capability is already widely available and jailbreakable in other public models. We will see if the government agrees or not in the following hours.

It's not clear if the jailbreaked safeguards are the model's regular safeguards or the extra safeguards in Fable. Since both models are affected by this directive, and the issue Anthropic received consisted just of reading a codebase and finding software flaws, I believe this jailbreak is not in the extra safeguards in Fable but in the regular safeguards in all models.