Anthropic cut off access to its Fable 5 and Mythos 5 AI models following a government export control directive citing national security concerns, blocking all foreign nationals and even internal employees. The company complied but criticized the lack of specific evidence, stating the alleged vulnerabilities were minor and available in other models like GPT-5.5.
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<p class="has-text-align-none">On Friday evening, the government ordered Anthropic to block access to <a href="https://www.anthropic.com/news/claude-fable-5-mythos-5">Fable 5 </a>and Mythos 5 for all foreign nations, both inside and outside the US, due to national security concerns. That order included employees of Anthropic. To meet those demands, the company has completely cut off access to the models for all customers.</p>
<p class="has-text-align-none">In a <a href="https://www.anthropic.com/news/fable-mythos-access">statement</a>, Anthropic said that while it was complying with the order, the government "did not provide specific details of its national security concern." Instead, it claims that any evidence of potential jailbreak was provided verbally, and that the vulnerabilities discovered were minor and available via other model …</p>
<p><a href="https://www.theverge.com/ai-artificial-intelligence/949553/anthropic-fable-5-mythos-5-government-national-security">Read the full story at The Verge.</a></p>
# Anthropic cuts off Fable 5 and Mythos 5 access following government order
Source: [https://www.theverge.com/ai-artificial-intelligence/949553/anthropic-fable-5-mythos-5-government-national-security](https://www.theverge.com/ai-artificial-intelligence/949553/anthropic-fable-5-mythos-5-government-national-security)
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An export control directive citing national security concerns required blocking access for all foreign nationals\.
An export control directive citing national security concerns required blocking access for all foreign nationals\.
by
Jun 13, 2026, 12:55 PM UTC
Image: Cath Virginia / The Verge
[](https://www.theverge.com/authors/terrence-obrien)
Terrence O'Brien
is the Verge’s weekend editor\. He has over 18 years of experience, including 10 years as managing editor at Engadget\.
On Friday evening, the government ordered Anthropic to block access to[Fable 5](https://www.anthropic.com/news/claude-fable-5-mythos-5)and Mythos 5 for all foreign nations, both inside and outside the US, due to national security concerns\. That order included employees of Anthropic\. To meet those demands, the company has completely cut off access to the models for all customers\.
In a[statement](https://www.anthropic.com/news/fable-mythos-access), Anthropic said that while it was complying with the order, the government “did not provide specific details of its national security concern\.” Instead, it claims that any evidence of potential jailbreak was provided verbally, and that the vulnerabilities discovered were minor and available via other models, including GPT 5\.5\.
In its statement, the company lays out the steps it took to safeguard Fable and Mythos, including working with the US and UK governments and changing its[data retention policy](https://support.claude.com/en/articles/15425996-data-retention-practices-for-mythos-class-models)to help track attempts to use them for malicious purposes\. It goes on to say that:
> We have not even received a disclosure of a concerning non\-universal potential jailbreak that led to a harmful result\. The potential jailbreaks that have been disclosed to us are either entirely benign responses or are minor findings that provide no Mythos\-specific uplift\.
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- Terrence O'Brien
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The US government has issued an export control directive to suspend access to Anthropic's Fable 5 and Mythos 5 models due to national security concerns, citing a potential jailbreak method. Anthropic is complying by disabling access for all customers, but disputes the severity of the vulnerability.
Anthropic disables its Claude Fable 5 and Mythos 5 AI models after receiving a US government export control directive citing national security concerns, escalating tensions between the company and the Trump administration.
The Trump administration ordered Anthropic to shut down its Fable 5 AI model using export law, marking the first time federal regulators have removed a deployed AI system from public access.
The US government forced Anthropic to disable its powerful AI models Fable 5 and Mythos 5 globally after only 72 hours due to export control concerns, setting a precedent that could drive AI development outside the US.
Amazon's cybersecurity research led to a White House directive banning foreign nationals from using Anthropic's Fable 5 and Mythos 5 models, sparking debate over whether the findings constitute a jailbreak.