US Government Orders Shutdown of Anthropic’s Fable 5 and Mythos 5 AI Models The abrupt shutdown of Anthropic’s Fable 5 and Mythos 5 has turned a technical security dispute into a global fight over who controls the world’s most powerful AI models.

On June 9, Anthropic launched Fable 5, a guarded public version of its ultra-capable Mythos 5 cybersecurity model, marketed as “safe for general use.” Within days, Amazon security researchers reported they could prompt Fable to surface exploitable code vulnerabilities, a finding CEO Andy Jassy relayed directly to senior US officials. On June 12, Commerce Secretary Howard Lutnick sent Anthropic an export-control order barring access to Fable 5 and Mythos 5 for any foreign national, including many of Anthropic’s own staff.

Anthropic said the letter gave no concrete evidence, only “verbal evidence of a potential narrow, non-universal jailbreak,” and argued the vulnerabilities were minor and “also discover[able]” by other public models. To comply, it disabled both models worldwide the same evening, warning that if such a standard were applied industry-wide “it would essentially halt all new model deployments for all frontier model providers.”

Inside the administration, officials framed the move as a national security safeguard, citing fears that Mythos-level systems could aid automated hacking and even that a China-linked group might have accessed the model. A 24‑hour blitz of tense calls failed to convince Anthropic to pull Fable voluntarily, culminating in the export controls that “forced Anthropic to pull its new AI model… just days after it was released.”

Over the following weekend, Anthropic flew senior engineers to Washington for crisis talks with Commerce and the White House, hoping to explain that Fable “wasn’t too powerful” and to restore access. The company’s official statement reiterated that tests had found no “universal jailbreak” and that its safeguards were “substantially more effective than those of any previously deployed model.”

Outside government, the backlash was swift. Nearly 100 cybersecurity leaders warned in an open letter that the decision “has taken the best models away from defenders, created market uncertainty, and risked America’s AI leadership without any real risk to justify it.” Axios reported that experts fear Washington is “setting a precedent that American models can’t do defensive security research,” potentially weakening US cyber defenses.

Allies and competitors seized on the episode. In India, the sudden cutoff of Anthropic’s most advanced models “landed as a warning shot about what happens when your AI infrastructure runs on someone else’s politics” and turbocharged calls for a multibillion-dollar sovereign AI fund and open‑source alternatives. European startup Mistral argued that the shutdown proves control ultimately rests with US providers and their governments, bolstering Europe’s push for “AI sovereignty.”

Financial and policy analysts now see the dispute as a test case for opaque, “capricious” US controls that could reshape AI valuations and spur non‑US ecosystems. As one TechCrunch analysis put it, the enforcement letter is a “wake-up call” that shows the US government can “shut you and your products down” — even for a model already “deployed to hundreds of millions of people.”

Continue reading https://foxvector.com/stories/019ed403-7334-05e8-7141-3619fc052405