US Commerce Department Orders Anthropic to Shut Down AI Models Globally
In June 2026, the U.S. Commerce Department ordered Anthropic to stop providing its Fable 5 and Mythos 5 AI models to foreign persons without a license after a jailbreak vulnerability was discovered. Anthropic responded by shutting down global public access for 18 days. The incident sparked transatlantic tensions, with European allies criticizing the unilateral restrictions and calling for technological sovereignty. Over 100 cyber experts signed an open letter urging the U.S. to lift the restrictions, warning it weakens collective cyber defense. Chinese AI models reportedly offer similar capabilities.
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Frontier AI and Cybersecurity: Transatlantic Tensions Over Model Access
The US government briefly suspended Anthropic's Fable 5 and Mythos 5 AI models after a jailbreak vulnerability was discovered, cutting off access for non-US nationals including European allies. This action confirmed European fears about dependency on US frontier AI and spurred renewed calls for technological sovereignty. The models, which detect software vulnerabilities at scale with an 87% success rate, were restored after security hardening. The episode triggered an open letter from over 100 American and allied cyber experts criticizing the unilateral restrictions. It also highlighted that the vulnerability technique was not unique to these models, and that Chinese alternatives are emerging. The article argues for a dedicated transatlantic forum to manage such tensions and for Europe to develop viable AI alternatives to support critical infrastructure sectors.
Frontier AI and Cybersecurity: US Export Controls on Anthropic Models Strain Transatlantic Relations
The US government briefly suspended Anthropic's Fable 5 and Mythos 5 AI models, which detect software vulnerabilities, after a jailbreak vulnerability was discovered. The export control directive required suspending access for non-US nationals, leading Anthropic to disable both models globally. This action confirmed European fears about dependency on US frontier AI and spurred calls for technological sovereignty. Over 100 American and allied cyber experts signed an open letter urging the US to lift restrictions, calling it an 'own goal' that weakens collective cyber defense. The episode highlighted the need for a dedicated transatlantic forum to manage tensions over frontier AI capabilities. Meanwhile, Chinese AI models reportedly perform most of what Fable 5 does, offering an alternative supply beyond US export controls. Anthropic's testing revealed the vulnerability exploitation technique was not unique to Fable 5, as all tested models could produce similar exploits.
US Suspension of Anthropic AI Models Sparks Transatlantic Tech Sovereignty Debate
The US government briefly suspended access to Anthropic's Fable 5 and Mythos 5 AI models after a jailbreak vulnerability was discovered, citing national security. The move, which cut off non-US users including European allies, confirmed European fears about dependency on American frontier AI and accelerated Brussels' push for technological sovereignty. While the models were restored after security hardening, the incident triggered an open letter from over 100 US and allied cyber experts criticizing the unilateral action as an 'own goal' that weakens collective cyber defense. The episode highlighted the strategic vulnerability of relying on US-controlled AI for critical cybersecurity functions, spurred allied discussions on developing alternatives, and noted that Chinese models already approximate Fable 5's capabilities. The author argues for a dedicated transatlantic forum to manage such tensions as AI capabilities advance.
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America Needs an Off-Ramp Between Doing Nothing and Shutting AI Down
In June 2026, the U.S. Commerce Department ordered Anthropic to stop providing its Fable 5 and Mythos 5 AI models to foreign persons without a license, leading to a global shutdown of the models for 18 days. The order followed Amazon security researchers reportedly finding a way to jailbreak the models' guardrails. The article argues that the U.S. lacks a trusted, standardized process for evaluating frontier AI security risks and applying proportionate remedies. It proposes creating a statutory AI security review agency with emergency powers, anti-capture safeguards, and allied mutual recognition to replace the current opaque and unpredictable system of emergency export controls and closed-door pressure.
America Needs an Off-Ramp Between Doing Nothing and Shutting AI Down
In June 2026, the U.S. Commerce Department ordered Anthropic to cease providing its Fable 5 and Mythos 5 AI models to foreign persons without a license, leading the company to shut down global public access for 18 days. Public access to Fable 5 was restored on June 30. The article argues that the United States lacks a trusted, standardized process for evaluating the security risks of frontier AI models and implementing proportionate remedies, highlighting the need for a middle ground between inaction and total shutdown.