US Government Orders Anthropic to Suspend Access to Fable 5 and Mythos 5 AI Models The abrupt shutdown of Anthropic’s most advanced AI models has exposed a global struggle over who controls frontier AI — and on what terms.

On June 9, Anthropic launched Fable 5, a public, “Mythos‑class” model that quickly topped the Chatbot Arena and “dominated every benchmark” against OpenAI’s GPT‑5.5. Just three days later, Amazon security researchers told the White House they had managed to “jailbreak and access portions of Anthropic’s powerful new Mythos model that pose a national security threat,” triggering an urgent round of calls inside the administration.

On June 12, Commerce Secretary Howard Lutnick sent Anthropic an export‑control letter subjecting Mythos 5 and Fable 5 to strict licensing rules for “any location outside of the U.S. and to all foreign persons within the country.” Time and other outlets reported that Anthropic responded by pulling “its two most powerful artificial intelligence models” offline for all users to comply. In its own statement, Anthropic said the letter “did not provide specific details” and that the government appeared to be reacting to a “narrow, non-universal jailbreak” whose vulnerabilities “other publicly-available models are able to discover as well.”

Over the ensuing weekend, the dispute escalated. TechCrunch noted that the Trump administration’s move showed “the AI industry isn’t immune from U.S. government interference,” and suggested the ban was “never about an AI jailbreak” alone. Axios described the action as an escalation in treating “cutting-edge AI systems as national security assets,” after officials worried a jailbreak could let models help exploit critical infrastructure. Semafor and The Verge reported additional fears that a China‑linked group may have accessed Mythos, raising concerns about model distillation and reverse‑engineering.

By June 14–15, the fight had spilled into global politics and markets. In India, the suspension “cut off Indian developers and enterprises from Claude’s most advanced models overnight,” turbocharging calls for a multibillion‑dollar sovereign AI program and greater reliance on open‑source models. In Europe, analysts said the episode “handed one of Europe’s leading AI startups exactly the opening it has been preparing for,” strengthening Mistral’s argument that countries should not “leave it to another country” to decide when AI is “turned off or turned on.”

Allies also framed the shutdown as a systemic risk. Canadian Prime Minister Mark Carney warned that the Anthropic ban shows “the danger of depending on a small number of powerful AI models,” likening today’s “model risk” to the concentrated exposures that helped trigger the 2008 financial crisis. Commentators at The Verge and the Financial Times argued that cutting access to Mythos and Fable may be “a gift to China,” and that Trump’s intervention “made the case for non-American AI” by proving how easily Washington can flip the switch on foreign users.

Meanwhile, crisis talks continued in Washington. Business Insider reported that Anthropic executives and senior Trump officials held hours of calls and in‑person meetings, with the export ban described as “the most significant escalation yet” in attempts to regulate AI and a precedent‑setting test of how far the White House is willing to go. The Next Web similarly called the standoff “a full‑blown confrontation between Silicon Valley and the Trump administration,” noting that Anthropic and regulators now “speak in different languages” even as both sides say they want a resolution.

Anthropic insists it supports giving government the power to block “unsafe deployments … as part of a statutory process that is transparent, fair, clear and grounded in technical facts,” but says this action “does not adhere to those principles.” For now, the world’s most capable public AI model is offline — and governments from Delhi to Ottawa to Brussels are treating that outage as a warning about who ultimately holds the off‑switch.

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