A US government order halted access to Claude Fable 5 and Mythos 5, citing national security. Whoever's position you take, the fact carries weight: frontier models are now being shut down through government processes.
- On June 12, a US government order halted access to Fable 5 and Mythos 5 for foreign nationals.
- The grounds: national security and a reported jailbreak tied to reading codebases to find flaws.
- Anthropic pushed back: perfect resistance to jailbreaks isn't possible for any provider.
One order. Two models, halted for hours. On June 12, Anthropic received a government order, citing national security authority - requiring it to cut off access to Claude Fable 5 and Claude Mythos 5 for foreign nationals, including its own foreign employees. To comply, Anthropic switched off both models for all customers. Other models are not affected.
I won't get into the politics of the dispute. The fact itself matters more. Once a single order can shut down two models for an entire class of users within hours, the assumption falls that once released, a model stays yours forever. The Frontier model comes with an off switch in someone else's hands - and that's now a line in the plan, not a mid-year surprise.
Here we're citing Anthropic's public statement; we don't have the full text of the order itself.