Anthropic Forced to Kill Access to Its Most Powerful Models After White House National Security Order
A Trump administration executive action has forced Anthropic to shut off access to its frontier Fable 5 and Mythos 5 models, citing export control and national security concerns. The move sets an unprecedented regulatory precedent and throws the company's IPO trajectory into uncertainty.
Anthropic has suspended access to its most advanced AI models — Fable 5 and its reasoning counterpart Mythos 5 — after a Trump administration order invoking national security concerns, as Bloomberg first reported. The shutdown is immediate and affects both API customers and direct users, marking the first time the U.S. government has forced a private AI lab to pull a frontier model from production after launch.
The timing is brutal. Anthropic had been riding a wave of momentum: Fable 5 had launched to strong reviews, the company was reportedly preparing IPO paperwork, and a Claude Builder Day event was imminent. All of that is now in disarray. As @rsvpilot03 noted, the convergence of a flagship model release, IPO filings, and the Apple-Siri overhaul had positioned this as a breakout quarter for the company. Instead, developers who built production workflows on Fable 5 are scrambling to downgrade or find alternatives.
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