aiqbench takeAI Safety

Anthropic's immediate suspension of its top-tier models, Claude Fable 5 and Mythos 5, stems from US export controls triggered by allegations that these specific versions could be jailbroken to bypass safety safeguards. The company contends the vulnerability is narrow and distinct from other public releases like GPT-5.5 or Opus 4.8, yet it disabled access globally—including for foreign nationals—to ensure strict compliance with national security directives without real-time filtering capabilities. This incident highlights a critical friction point between rapid AI model deployment and evolving government mandates regarding export controls on frontier models perceived as high-risk.

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Anthropic Disables Claude Fable 5 and Mythos 5 After US Government Order

MarkTechPostJune 13, 20267 min read

shutdown followed a US government export control directive citing national security authorities. All other Anthropic models, including Opus 4.8, remain available. The post Anthropic Disables Claude Fable 5 and Mythos 5 After US Government Order appeared first on MarkTechPost.

Anthropic has disabled its two most capable models for every customer. The shutdown followed a US government export control directive. The order arrived on June 12, 2026. It named Claude Fable 5 and Claude Mythos 5 specifically. Both models had launched only three days earlier, on June 9. The directive cited national security authorities, according to Anthropic. It suspended access by any foreign national, inside or outside the United States. That scope included Anthropic’s own foreign national employees. Anthropic cannot filter foreign nationals from US users in real time. So it shut both models down for everyone…

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