The US Government Used an Export Control as a Model Kill Switch. It Fired on the Wrong Model.
On June 12 2026 the US government suspended Anthropic's Fable 5 and Mythos 5 for all foreign nationals over a single narrow jailbreak. Anthropic's own testing found eight other models, from Claude Haiku 4.5 up through GPT-5.5, could do the same thing. Three days after launch, a control aimed at the dangerous model denied the safe one to everyone, including US customers.








