White House orders global freeze on Anthropic’s Claude Fable 5

Just three days after launch, Anthropic completely pulled the plug on its brand-new Claude Fable 5 and Mythos 5 models after a U.S. government export-control directive flagged national security risks tied to their safety behavior. 

The White House ordered Anthropic to immediately block access for all foreign nationals, a sweeping category that includes international enterprise clients, researchers, and even Anthropic’s own foreign-national employees. With no real way to selectively filter users on the fly, Anthropic chose to disable the systems globally, leaving developers scrambling and redirecting API traffic to the older Opus 4.8. 

The regulatory hammer dropped after a frantic 24-hour standoff. Senior Trump administration officials, including Treasury Secretary Scott Bessent and White House Cyber Director Sean Cairncross, tried to pressure CEO Dario Amodei into a voluntary pause. 

The panic stems from a sophisticated jailbreakexecuted by security researcher Pliny the Liberator, who bypassed the models’ safety guards using prompt manipulation that combined Unicode variations, long-context tracking, and multi-agent reconstruction. The feds worry the exploit leaves critical infrastructure vulnerable, while Anthropic argues the government overreacted to a narrow exploit without technical transparency. 

The sudden freeze interrupts a massive victory lap for Anthropic. Fable 5 had just crushed OpenAI’s GPT-5.5 on Epoch AI’s grueling FrontierMath benchmark, scoring 88% on the research-level tier 4 problems compared to OpenAI’s 75%. Now, Anthropic has rushed an emergency technical delegation to Washington, D.C., to negotiate an off-ramp. 

Meanwhile, Amodei is looking at the bigger picture, floating a policy proposal to tax AI corporate profits to fund a universal basic income before these exact kinds of automation permanently displace entry-level white-collar workers.