RegulationModelsSecurity

US orders Anthropic to take Fable 5 and Mythos 5 offline

The U.S. government issues an order citing national‑security concerns that forces Anthropic to take its newest models, Fable 5 and Mythos 5, offline for foreign access.

In detail

  • Order arrived last Friday citing “national security concerns” without public specifics
  • Anthropic pulled Fable 5 (public) and Mythos 5 (available to Mythos users) because it cannot reliably block foreign nationals, including foreign employees
  • Reports suggest Amazon researchers flagged a guardrail bypass and Amazon CEO Andy Jassy raised the issue with the White House
  • Cybersecurity experts have signed an open letter asking the administration to revoke the order, warning it removes advanced defenses from US network defenders

Why it matters

This intervention demonstrates that national security and export controls can abruptly curtail availability of major models, affecting vendors, integrations and defenders that rely on them.

For you Check whether any AI vendors or models you rely on are US‑based and plan substitutes or contingency steps in case access is suddenly restricted.

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