'AI of AIs' Mythos Suspended Following U.S. Government Directive

The U.S. administration has issued a total ban on foreign nationals accessing Anthropic's top-tier artificial intelligence (AI) models, including 'Mythos.'

Anthropic announced, "The U.S. government has issued export control guidelines, in accordance with directives from national security authorities, that completely suspend access to 'Fable 5' and 'Mythos 5' for all foreign nationals."

The directive prohibits not only access to Mythos from abroad but also access by foreign nationals currently within the United States.

This even includes Anthropic's own foreign employees.

Anthropic stated that it has immediately suspended Fable 5 and Mythos 5 services for all customers to comply with the regulations.

Regarding the government's directive, Anthropic explained, "The letter did not specify details regarding the national security concerns."

However, Anthropic speculated that the government likely believes users can bypass the safety guardrails of Fable 5—designed to prevent misuse such as malicious hacking or the creation of biochemical weapons—using a method known as 'jailbreaking.'

The company added that it views this as a misunderstanding and is working to restore services as quickly as possible.

Anthropic further noted that the jailbreaking method identified by the government is widely used in other models, including OpenAI's GPT-5.5, and is utilized daily by experts responsible for system security.

"While we believe the government should have the authority to block the distribution of unsafe AI through transparent, fair, and technically grounded legal processes, this measure does not align with those principles," the company pointed out.

Sources reported that the government previously attempted to temporarily halt the release of Anthropic's models but, after failing to do so, issued the export control notice. The access restrictions are expected to remain in place for several weeks until the U.S. government's security framework is strengthened.

Mythos has sparked concerns across the global security industry, dubbed the 'Mythos Shock,' due to its reported capabilities, such as quickly identifying bugs that humans have failed to discover for decades.
※ Please note: This article was translated by AI and may contain errors.