• Launch and early warnings
• Amazon raises alarm, White House intervenes
• Company pushback and crisis talks
• Security, sovereignty, and industry backlash

US Government Orders Shutdown of Anthropic’s Fable 5 and Mythos 5 AI Models Anthropic’s most powerful AI models were online for just three days before Washington ordered them effectively unplugged, igniting a global fight over how far governments can go in policing frontier AI.

§Launch and early warnings

On June 9, Anthropic released Fable 5, describing it as its most capable generally available model, built on the same base system as the more restricted Mythos 5. Mythos had already been flagged by CEO Dario Amodei as so strong at finding software vulnerabilities that it posed “serious threats.”

§Amazon raises alarm, White House intervenes

Within days, Amazon security researchers told the White House they had found a way to get Fable 5 to surface code useful for cyberattacks, according to multiple reports. Commerce Secretary Howard Lutnick then sent an export-control letter on June 12, barring access to Fable 5 and Mythos 5 for any foreign national, including Anthropic’s own staff.

Anthropic says the government “did not provide specific details of its national security concern,” and that the demonstrated bypass exposed only “previously known, minor vulnerabilities” that other public models can also find. To comply, it disabled both models worldwide the same evening.

§Company pushback and crisis talks

Anthropic argues that recalling a commercial model over a “narrow potential jailbreak” would, if applied broadly, “essentially halt all new model deployments for all frontier model providers.” It flew senior technical staff to Washington for emergency meetings with Commerce and White House officials, seeking to explain its safeguards and restore access.

§Security, sovereignty, and industry backlash

The Trump administration frames the move as a national-security measure amid worries over automated hacking and even possible China-linked access to Mythos. But nearly 100 cybersecurity leaders signed an open letter warning that pulling “the best models away from defenders” harms U.S. cyber defense while adversaries keep building.

Abroad, the shutdown has turbocharged arguments for “sovereign AI.” In India, where Anthropic had just announced a major partnership, the episode “landed as a warning shot about what happens when your AI infrastructure runs on someone else’s politics.” European startup Mistral and other non-U.S. providers say the case proves that foreign users remain exposed to Washington’s export whims.

Meanwhile, investors and competitors are watching how far the White House will go. Analysts note that the dispute shows “the AI industry isn’t immune from U.S. government interference” and could set a precedent for future shutdowns of cutting‑edge models.

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