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Anthropic's decision to block global access to its Fable 5 and Mythos 5 models represents a significant shift in AI export controls driven by national security directives rather than technical vulnerabilities or safety failures. This move highlights the growing tension between international model deployment and domestic regulatory constraints, potentially fragmenting the ecosystem for advanced language systems outside the US.

Sources coveringThe Verge, LessWrong, Latent Space, ZDNet

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Anthropic cuts off Fable 5 and Mythos 5 access following government order

The VergeJune 13, 20262 min read

On Friday evening, the government ordered Anthropic to block access to Fable 5 and Mythos 5 for all foreign nations, both inside and outside the US, due to national security concerns. That order included employees of Anthropic. To meet those demands, the company has completely cut off access to the models for all customers. In a statement, Anthropic said that while it was complying with the order, the government "did not provide specific details of its national security concern." Instead, it claims that any evidence of potential jailbreak was provided verbally, and that the vulnerabilities discovered were minor and available via other model … Read the full story at The Verge.

An export control directive citing national security concerns required blocking access for all foreign nationals. An export control directive citing national security concerns required blocking access for all foreign nationals. is…

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