Anthropic is restoring access to its two most advanced AI models after the US government lifted export controls that forced it to withdraw them last month.
The controls on Claude Fable 5 and Claude Mythos 5 were removed on June 30, the company said. Fable 5 will return globally on July 1 across Anthropic’s platforms, while Mythos 5, which shares the same underlying model but has fewer security restrictions, will be restored to a number of US organizations following government approval on June 26.
The freeze dates to June 12, when the government applied export controls, rules that limit which foreign nationals can access a technology, to both models.
Because the order took effect immediately and Anthropic couldn’t verify users’ nationalities in real time, it suspended access for everyone rather than risk breaking the rule.
The trigger was a cybersecurity discovery after Amazon researchers reported a way to bypass Fable 5’s security measures, a technique known as a jailbreak, which caused the model to identify software vulnerabilities and, in one case, produce code showing how to exploit.
