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US Directive Forces Anthropic to Shut Down Claude Mythos 5 and Fable 5

Anthropic has disabled access to its Claude Mythos 5 and Claude Fable 5 models for all users following a US government directive. This export-control measure, reportedly linked to national security concerns, took effect on June 12, 2026. Details regarding the models' development and intended access were limited prior to the shutdown. AI

IMPACT US export controls are directly impacting AI model availability, signaling potential future restrictions on AI development and deployment.

RANK_REASON A US government directive forced a major AI lab to disable access to its models. [lever_c_demoted from significant: ic=1 ai=1.0]

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COVERAGE [1]

  1. dev.to — Anthropic tag TIER_1 English(EN) · MLXIO ·

    US Order Kills Claude Mythos 5 and Fable 5 Access

    <p>Anthropic shut Mythos 5 and Fable 5 for all users after a US directive targeted foreign-national access.</p> <h3> Key takeaways </h3> <ul> <li>On <strong>the night of June 12, 2026</strong>, Anthropic turned off <strong>Claude Mythos 5</strong> and <strong>Claude Fable 5</stro…