Anthropic disables access to its Fable 5 and Mythos 5 AI models following a U.S. government directive tied to export controls. Multiple reports say the action follows concerns raised by the Commerce Department about potential national security risks. Ars Technica reports that the rationale includes worries that a “Fable 5 jailbreak” could be used in ways that threaten national security. CNBC and Business Insider describe the change more generally as compliance with an export control instruction from the Trump administration, which cites security concerns. In each account, Anthropic’s response is framed as disabling access to the models rather than removing them permanently or changing other parts of its product lineup. The reports do not provide additional technical details on how the disabling is implemented, nor do they specify which parties are affected. Overall, the decision is presented as a regulatory compliance step in response to government concerns about misuse and security associated with the newest models.