According to a US administration official, Commerce Secretary Howard Lutnick informed Anthropic CEO Dario Amodei in a letter sent on Friday that the company’s newly released Fable 5 and Mythos 5 models are now classified under export control rules.

To comply with the directive, Anthropic has moved to disable access for all affected users, reflecting Washington’s growing view that cutting-edge AI capabilities should be treated as strategically sensitive technologies.

Broad export restrictions leave no room for exceptions

Anthropic said it chose to disable access to its two newest AI models entirely because the new US restrictions apply to a wide range of users, making selective enforcement impractical. The rules cover foreign governments, companies, and individuals, and even extend to some foreign-born Anthropic employees working in the country, the Wall Street Journal reported.

“The net effect of this order is that we must abruptly disable Fable 5 and Mythos 5 for all our customers to ensure compliance. Access to all other Claude models is not affected,” the company said in a statement on X, noting that they were “working to restore access as soon as possible”. 

WSJ also notes that the decision marks one of the clearest signs yet that Washington is willing to intervene directly in the global AI race, treating advanced models as strategic technologies rather than ordinary commercial products. 

For companies such as Anthropic and its rivals, which are competing aggressively to release ever more capable systems ahead of highly anticipated public listings, regulatory hurdles and forced slowdowns can carry enormous financial consequences. Any disruption to product rollouts or access to international markets risks delaying growth plans and could ultimately cost the industry billions of dollars in lost revenue and valuation.

Mythos access freeze raises concerns for critical infrastructure security 

The suspension of access to Mythos could have immediate consequences far beyond the AI sector, as governments and private organizations have increasingly relied on the model to detect and fix software vulnerabilities. A prolonged shutdown could disrupt ongoing cybersecurity operations and delay critical defensive work across a range of industries, WSJ adds.

Sectors such as finance, energy, and critical infrastructure have already integrated the technology into their security workflows. The development comes only days after Anthropic introduced Fable, a next-generation model built on the same advanced architecture as Mythos, making it available to the public with additional safeguards designed to limit potentially dangerous capabilities.

Tensions between Anthropic and the Trump administration have been building for months over the rules governing how the Pentagon can deploy the company’s AI systems. At the center of the dispute are the safety guardrails and operational limits attached to Anthropic’s models. 

According to Washington DC-based AI columnist Ron Schmelzer, the biggest takeaway from the latest restrictions is that governments are increasingly treating advanced AI as a strategic technology, on par with nuclear capabilities or high-grade encryption.

“While the US was focusing on preventing foreign users from accessing Anthropic’s most powerful models, Anthropic’s reaction of making it unavailable to everyone shows that there’s a tension here between the AI mega companies efforts to rapidly increase their market share and profitability and governments efforts to make sure that AI is used for their benefit. In this push and pull, who will win, multi-billion dollar companies (or even trillion-dollar) or powerful governments?” he tells Interesting Engineering (IE).

The latest decision to impose new restrictions could further intensify that standoff, raising the stakes in an increasingly contentious debate over the military use of advanced AI.

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