In an unprecedented move, the U.S. government has ordered Anthropic to block all foreign nationals from accessing its most advanced artificial intelligence models, forcing the company to abruptly disable Fable 5 and Mythos 5 for everyone.
Anthropic, the company behind the popular Claude chatbot, confirmed it received an export control directive from the Trump administration on Friday, June 12, ordering it to prevent any non-U.S. person from accessing its cutting-edge AI systems. The order applies even to foreign nationals currently residing in the United States, including those employed by Anthropic itself.
Why the Government Stepped In
The administration's stated concern centers on a potential security vulnerability. Government officials claimed they had identified a method to bypass (or "jailbreak") a safeguard in Fable 5 designed to prevent the AI from being used to identify software vulnerabilities in computer systems.
Anthropic pushed back, saying it had only received "verbal evidence of a potential narrow, non-universal jailbreak" from the government. The company argued that rival models, including OpenAI's GPT-5.5, possess similar capabilities and that the order sets a dangerous precedent.
"We disagree that the finding of a narrow potential jailbreak should be cause for recalling a commercial model deployed to hundreds of millions of people," Anthropic said in a blog post. "If this standard was applied across the industry, we believe it would essentially halt all new model deployments for all frontier model providers."
What Are Fable 5 and Mythos 5?
Fable 5, released just days before the order, is Anthropic's first consumer-grade model built on the powerful Mythos architecture. It includes guardrails that block its use in high-risk areas like cybersecurity and biotechnology. Mythos 5, the full unrestricted version, is reserved for government agencies and select corporate partners to help harden their systems against cyberattacks.
The technology behind Mythos is exceptionally good at detecting software vulnerabilities — some of which have remained undiscovered for decades. The concern from the outset has been that in the wrong hands, such AI could become a dangerous cyberweapon.
Escalating Tensions Between Anthropic and the White House
This directive marks the latest and most dramatic escalation in a long-running dispute between Anthropic and the Trump administration. Earlier in 2026, Anthropic refused to allow the U.S. military to use its AI models for domestic surveillance and fully autonomous weapons. In response, the Pentagon placed the company on a supply-chain risk blacklist — a designation Anthropic is still challenging in court.
Just days before the shutdown order, signs had emerged that tensions were easing. Anthropic CEO Dario Amodei visited the White House in April for discussions, and the company had worked with the administration on a June 2 executive order asking AI developers to voluntarily share advanced models with the government for cybersecurity testing.
The Commerce Department issued the formal export control directive, and a U.S. official confirmed to Reuters that the order stemmed from national security concerns. According to Semafor, the directive was partly motivated by suspicions that a China-linked group had accessed Anthropic's new models.
Kirsten Davies, the Pentagon's Chief Information Officer, posted on X: "Some things are simply more important than revenue cycles, clickbait, and pre-IPO valuation. America First. Always."
IPO Implications
The timing is particularly significant. Anthropic confidentially filed for a U.S. IPO in early June, edging ahead of rival OpenAI in the race to reach public markets. The sudden government intervention could complicate its valuation and investor confidence.
Anthropic acknowledged the broader impact: "The net effect of this order is that we must abruptly disable Fable 5 and Mythos 5 for all our customers to ensure compliance."
Industry-Wide Implications
This action represents a major escalation of U.S. AI export control policy. Previous restrictions focused on limiting foreign access to AI chips and development tools. This is the first time the government has directly ordered a company to restrict access to a deployed AI model based on the user's nationality.
Amazon Web Services confirmed that Anthropic requested it revoke access to Fable 5 and Mythos 5 for all users in all regions to comply with the order. The practical effect means anyone wishing to use Anthropic's latest models will likely need to prove U.S. citizenship.
As AI capabilities continue to accelerate, this case raises fundamental questions about who gets to control access to powerful technologies — and how national security concerns will shape the future of the entire industry.
For more on AI regulation and security, check out our articles on AI safety concerns and tech industry regulation updates.
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