US Orders Anthropic to Block Foreign Access to Mythos

Bloomberg Television
Bloomberg TelevisionJun 15, 2026

Why It Matters

The directive signals a potential tightening of AI export controls, threatening market access for foreign customers and reshaping investment dynamics in the rapidly expanding generative‑AI industry.

Key Takeaways

  • US orders Anthropic to block foreign nationals from Mythos models.
  • Order stems from discovered jailbreak vulnerability in newly released AI.
  • Anthropic disabled access to its flagship Five and Mythos models.
  • The move highlights tension between AI innovation and national security.
  • Potential regulatory ripple could reshape global AI market and investments.

Summary

The Trump administration issued an unprecedented directive ordering Anthropic to deny all foreign nationals access to its flagship Five and Mythos AI models. The order, announced Friday and enforced over the weekend, came after officials identified a jailbreak method that could bypass the models’ safety controls.

Anthropic responded by immediately disabling the models, which had been publicly available for only three days. The government cited national‑security concerns, arguing that the vulnerability could allow adversaries to exploit advanced generative AI. Bloomberg’s senior analyst described the episode as a "dramatic standoff" between the company and regulators.

The analyst also noted that Anthropic’s safeguards were already considered overly restrictive by some users, yet the breach revealed that even tight controls can be circumvented. He warned that excessive regulation could stifle the rapid growth of the AI sector, while insufficient oversight risks security breaches.

The incident underscores a broader policy dilemma: balancing U.S. leadership in AI development with export‑control and security imperatives. Investors and tech firms will watch closely as regulators decide whether this case signals a wave of stricter export rules that could reshape global AI competition and valuation.

Original Description

The US government has ordered Anthropic PBC to disable access to its most advanced AI models, such as Mythos and Fable 5, for all foreign nationals. The order comes after the US government discovered it’s possible to “jailbreak,” or bypass the guardrails, of the Fable 5. Bloomberg's Neil Campling reports.
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