Anthropic 'abruptly' disables Fable 5, Mythos 5 to comply with US govt directive; says 'this is a misunderstanding' | Company Business News

Anthropic has abruptly disabled global access to its Fable 5 and Mythos 5 artificial intelligence models after the US government issued an export control directive on national security grounds, ordering the company to block all foreign nationals from using the systems, including Anthropic's own employees who do not hold US citizenship.

Anthropic received the instruction at 5:21 p.m. ET on Friday, requiring it to suspend all access to both models by "any foreign national, whether inside or outside the United States, including foreign national Anthropic employees."

Anthropic confirmed that all remaining Claude models are unaffected by the directive and continue to function normally.

Fable 5 was notable in that it represented the first time Anthropic had made such an advanced model broadly available to the public, a step made possible by new safeguards designed to block outputs in specific high-risk categories.

Both models built directly on the groundwork laid by Claude Mythos Preview, which drew sustained attention from Wall Street and government officials in April for its advanced cybersecurity capabilities.

Anthropic had indicated at that point that it had no intention of making Mythos Preview generally available, restricting access instead to a select group of organisations through a cybersecurity initiative called Project Glasswing.