GOVERNMENT PULLS THE PLUG ON ANTHROPIC’S MOST POWERFUL AI MODELS OVER NATIONAL SECURITY FEARS The U.S. government ordered Anthropic to cut off all foreign nationals from its two most capable AI models, Fable 5 and Mythos 5, citing national security concerns. Anthropic complied on June 12, but there was a catch: to actually enforce the directive, the company had to pull the models entirely, for every user in the world, not just foreign nationals. The government apparently believes someone found a way to jailbreak Fable 5, a method for bypassing its safety guardrails. It did not share specifics with Anthropic. The company says it disputes the directive and thinks the standard being applied would effectively shut down every frontier model deployment across the AI industry if applied broadly. This is a landmark moment. For the first time, a U.S. government agency has directly intervened to take a leading AI model offline. The timing is brutal for Anthropic, which filed confidentially for a 965 billion dollar IPO just 11 days before the suspension. Enterprise customers, many of whom depend on these models for production systems, were given no advance notice. What happens next sets a precedent that every AI lab in the country is watching very closely. The directive raises fundamental questions about who ultimately controls the release of frontier AI and under what circumstances the government can compel a private company to pull a product from the market. Keywords: Anthropic Claude suspended, Fable 5 national security, US government AI models, Claude Mythos 5