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Anthropic has suspended access to its two most powerful AI models, Fable 5 and Mythos 5, to comply with a US government directive citing “national security”, just three days after their commercial launch. Washington has ordered, under export control regulations, that access to these models be cut off for “any foreign national, inside or outside the US,” including Anthropic’s “foreign employees,” according to the AI startup. Finding it impossible to filter its users based on nationality, Anthropic had to announce the stop.
US government order and export control
Anthropic, which a few days ago presented the prospectus in confidential form to the SEC in view of the listing on Wall Street, received the order from the US government on Friday afternoon, at 5.21pm in Washington (11.21pm in Italy). “The direct consequence of the order is that we must immediately disable Fable 5 and Mythos 5 for all our customers, in order to ensure compliance,” the company reported, specifying that all other models will not be affected.
What are Fable 5 and Mythos 5 and Project Glasswing
Fable 5 and Mythos 5 are the two models that Anthropic has presented as cutting edge in various industry benchmarks. Fable 5, in particular, marked the first time the startup made such an advanced offering public, thanks to new security measures that block responses in specific high-risk areas. The models were based on the Claude Mythos Preview release, which impressed Wall Street and government officials in April with its advanced cybersecurity capabilities. The company, on the occasion, declared that it did not want to make the model available to the general public, limiting its launch to an initial selected group of companies as part of a cybersecurity initiative called Project Glasswing.
Anthropic’s replica
In Friday’s statement, Anthropic, apologizing to customers for the disservice, recalled that, “as stated publicly, we believe that the government should have the power to block unsafe applications, as part of a regulatory process that is transparent, fair, clear and based on concrete technical data”, observing however that “this action does not respect these principles”.
The clash with the government and the legal case
The announcement marks the latest clash between Anthropic and the US government. The Pentagon this year classified the startup as a supply chain risk, deeming the company a threat to US national security: a label, reserved for foreign adversaries, that requires defense contractors to certify that they will not use Anthropic’s Claude models in activities carried out for the armed forces. Anthropic is suing the Trump administration to overturn the provision in an ongoing legal dispute.