US Orders Anthropic to Ban Foreign Access to Fable, Mythos AI Models

The US government ordered Anthropic to suspend all access to its Fable 5 and Mythos 5 AI models for any foreign national on June 12, 2026 at 5:21 PM Eastern Time , forcing the company to abruptly disable both models for all customers worldwide . Anthropic had launched Claude Fable 5 on June 9, 2026, and by Friday the 12th at around 5:21 PM Eastern time, it was completely offline .

Commerce Secretary Howard Lutnick sent a letter to Anthropic chief executive Dario Amodei informing the company that Fable 5 and Mythos 5 would be subject to export controls . This appears to be the first time the US government has used export-control authority to force the worldwide shutdown of a commercial AI model .

What Triggered the Export Control Order?

The Wall Street Journal reports that Amazon CEO Andy Jassy told Treasury Secretary Scott Bessent and other government officials that Amazon researchers used Anthropic's Claude Fable 5 to obtain information that could be used in cyberattacks . Shortly after the researchers jailbroke the model, Jassy and White House officials, including Bessent, reportedly met, and the officials decided to prevent companies and individuals from accessing the tool, with President Donald Trump signing off soon after .

Anthropic said the government believes it has become aware of a method of bypassing, or "jailbreaking" Fable 5 , though the letter did not provide specific details of its national security concern . The company reviewed a demonstration of this specific technique being used to identify a small number of previously known, minor vulnerabilities .

Amazon's role is particularly notable given its position as a major Anthropic investor. Amazon is a major investor in Anthropic, with the two companies having a multi-billion dollar partnership that includes cloud computing services and AI model development .

Why Did Anthropic Shut Down Models Globally?

The US government told Anthropic to suspend access to the Fable 5 and Mythos 5 models by any foreign national "whether inside or outside the United States," citing national security concerns . The order mandates that no foreign national, whether inside or outside the United States, including Anthropic's own foreign national employees, be permitted access to the two models .

Because the company says it cannot reliably separate foreign users from the rest of its base in real time, the practical result is a worldwide shutoff of both models . Access to all other Anthropic models will not be affected .

The scope of the ban is unprecedented. This directive affects not only the United States' closest allies, the UK, Canada, Australia, and New Zealand, but their nationals as well, regardless of whether or not they reside in the US .

How Does This Compare to Previous AI Export Controls?

The U.S. government has used export controls in the past to restrict the sale of semiconductor chips that power AI models, but never on the models themselves . The US Department of Commerce's Bureau of Industry and Security introduced its Framework for Artificial Intelligence Diffusion on January 15, 2025, which included the first-ever export controls on artificial intelligence models .

However, those January 2025 controls established a licensing framework. The mechanism — restricting "foreign national" access to a cloud-delivered model so broadly that the only compliant response is to turn it off for everyone — establishes that a frontier model is now treated less like a software product and more like a controlled technology, akin to advanced chips or weapons components .

To the best of our knowledge, this is the first time the United States has issued an export control directive for LLM access, ever .

What Were Fable 5 and Mythos 5?

Anthropic launched Claude Fable 5 on June 9, 2026, the first publicly available version of its Mythos model . Mythos-class models are a tier of Claude models that sit above the Opus class in capability, with the first, Claude Mythos Preview, released in April through Project Glasswing, followed by Claude Fable 5 and Claude Mythos 5 .

Anthropic says Fable 5 excels at software engineering, knowledge work, and vision, but it comes with hard safety limits, and in high-risk areas like cybersecurity, biology, chemistry, and distillation, the model blocks responses and falls back to Claude Opus 4.8 .

The models built on the release of Claude Mythos Preview, which captivated Wall Street and government officials with its advanced cybersecurity capabilities in April, and the company said it did not plan to make the model generally available, limiting the rollout to a select group of companies as part of a cybersecurity initiative called Project Glasswing .

How Has Anthropic Responded?

Anthropic said it is complying with the government's directive but strongly disagrees with the rationale behind the order, stating "We are complying with the government's legal directive and are removing access to Fable 5 and Mythos 5 for all users" . The company added, "However, 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 reviewed a demonstration of the specific jailbreak technique being used to identify a small number of previously known, minor vulnerabilities . The company said the government has so far provided only verbal evidence of a "narrow, non-universal jailbreak" that involves asking the model to read a specific codebase and fix software flaws, and argues that the capability in question is widely available from other models, including OpenAI's GPT-5.5 .

What Changed This Week

The Commerce Department's June 12 directive represents the first time the US government has forced a commercial AI model offline worldwide using export control authority. The order came just three days after Anthropic launched Fable 5 to the public, following concerns raised by Amazon researchers and CEO Andy Jassy about potential cybersecurity vulnerabilities. Anthropic disabled both Fable 5 and Mythos 5 globally because it cannot reliably distinguish foreign nationals from US citizens in its user base, affecting customers worldwide including in allied nations.

What to Watch

Anthropic has stated it believes the government action is a misunderstanding and is working to restore access. The company must now satisfy government reviewers that it has addressed the security concerns identified by Amazon's research. This case will likely set precedent for how the US government regulates frontier AI models going forward, potentially affecting other AI companies developing advanced systems. Industry observers are watching whether the Commerce Department will issue similar directives to other AI labs, and whether Anthropic will challenge the order legally. The next key milestone is whether the government provides specific technical details about the jailbreak vulnerability and what remediation steps would allow the models to return online.

Reporting based on coverage from Bloomberg, CNN, The Verge, TechCrunch, Anthropic, Axios, CNBC, Wall Street Journal, NBC News, Fortune, Time, June 12-14, 2026.