Shared from twixb · simonwillison.net

Statement on the US government directive to suspend access to Fable 5 and Mythos 5

simonwillison.net·Jun 13, 2026

The U.S. government has issued a directive to suspend access to Anthropic's AI models Fable 5 and Mythos 5 for all foreign nationals due to national security concerns related to potential vulnerabilities, prompting Anthropic to disable access for all customers. The directive was received abruptly, and Anthropic plans to provide more details shortly.

The US government's directive to suspend access to Fable 5 and Mythos 5 due to national security concerns highlights the importance of staying informed about potential vulnerabilities in AI models. As a professional tracking AI coding and agents, this incident underscores the need to continuously assess and adapt your security protocols around AI tools, as well as to monitor government regulations that may impact access to critical technologies.

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