Statement on the US government directive to suspend access to Fable 5 and Mythos 5
US government export control directive forced Anthropic to disable Fable 5 and Mythos 5 for all customers over a jailbreak concern.
“The US government, citing national security authorities, has issued an export control directive to suspend all access to Fable 5 and Mythos 5 by any foreign national, whether inside or outside the United States, including foreign national Anthropic employees.”
A US government national security directive citing export control authorities forced Anthropic to abruptly disable Fable 5 and Mythos 5 for all customers, apparently over a narrow jailbreak that asks the model to find software flaws in a codebase. Anthropic argues the demonstrated capability is minor and widely available from other models like GPT-5.5, making this a significant precedent for government intervention in AI model access.