Anthropic: US export-control directive suspends Fable 5 and Mythos 5 access for all foreign nationals

Anthropic said the US government, citing national-security authorities, had issued an export-control directive barring any foreign national, inside or outside the US and including Anthropic's own foreign-national staff, from accessing Fable 5 and Mythos 5. Because nationality could not be separated in real time, the models went dark for all customers. Press (Marktechpost, Rohan Paul) reported the directive arrived June 12 at 5:21pm ET and was triggered by a reported safeguard bypass (Amazon researchers). Anthropic complied but called the jailbreak narrow. Posted 2026-06-13T00:50:03Z UTC (evening of June 12 US time), verified via syndication. Follow-ups: 2026-06-26 US redeployment of Mythos 5 (x.com/AnthropicAI/status/2070665903440871779), 2026-06-30 controls lifted (x.com/AnthropicAI/status/2072106151890809341), and 2026-07-01 global Fable 5 return with new classifiers (x.com/AnthropicAI/status/2072163884430229756), all verified.

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.

The net effect of this order is that we must abruptly disable Fable 5 and Mythos 5 for all our customers to ensure compliance.

Access to all other Claude models is not affected.

We apologize for this disruption to our customers. We believe this is a misunderstanding and are working to restore access as soon as possible.

Read our full statement: https://www.anthropic.com/news/fable-mythos-access

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Archived 2026-09-29 via fxtwitter (unofficial).