The US government issued an export control directive on June 12, ordering Anthropic to suspend access to its two most powerful AI models. The models, Fable 5 and Mythos 5, were pulled from service just three days after their public launch. This marks the first time the federal government has forced a commercial AI product offline.
Anthropic said it received the directive at 5:21 p.m. Eastern Time on June 12. The letter came from Commerce Secretary Howard Lutnick, written with input from other government officials. The Commerce Department did not immediately respond to requests for comment.
The US government, citing national security authorities, has issued an export control directive to suspend all access to Fable 5 and Mythos 5 by any foreign national, whether inside or outside the United States, including foreign national Anthropic employees.
The net effect of…
— Anthropic (@AnthropicAI) June 13, 2026
The directive cited national security authorities. It ordered Anthropic to cut off access for any foreign national, whether located inside or outside the United States. The order also covered foreign national employees working at Anthropic itself.
Anthropic Fable 5 and Mythos 5 Taken Offline for All Users
Anthropic said it could not reliably filter foreign nationals from its broader user base in real time. As a result, the company had to disable both models for every customer worldwide, not just foreign users.
“The net effect of this order is that we must abruptly disable Fable 5 and Mythos 5 for all our customers to ensure compliance,” Anthropic said in a public statement. Claude’s landing page showed a notice that Fable 5 was temporarily unavailable as of Friday evening.
Claude’s landing page showed a notice that Fable 5 was temporarily unavailable [Source: Colitco]
Anthropic confirmed that all other models, including Claude Opus, Sonnet, and Haiku, remain active. Only Fable 5 and Mythos 5 faced the shutdown order.
Government Cites Jailbreak Risk Behind Anthropic Fable 5 Directive
Officials told Anthropic that the government acted after learning of a technique to bypass Fable 5’s built-in safeguards. These safeguards were designed to prevent users from accessing the advanced cybersecurity capabilities of Mythos 5, the underlying model on which Fable 5 is built.
The government believed the jailbreak technique created a national security risk. However, it did not include specific technical details in the directive it sent to Anthropic. Anthropic said the letter did not disclose the full nature of the security concern.
The Commerce Department used export control powers to justify the order. The legal basis drew on national security authorities, though critics noted the government wrote the legal predicate for the action itself.
Anthropic Disputes the Severity of the Jailbreak Threat
Anthropic reviewed the jailbreak technique the government cited. The company said it believes the vulnerability is narrow, not a universal flaw that defeats all of Fable 5’s protections.
Anthropic said the jailbreak would unlock Mythos 5’s cybersecurity capabilities only in one specific scenario. The company also said the same technique could draw similar outputs from OpenAI’s GPT-5.5, a model not subject to any comparable export controls. “We have not even received a disclosure of a concerning non-universal potential jailbreak that led to a harmful result,” the company said.
Anthropic added that it stands by its defense-in-depth approach. The company said this strategy makes jailbreaks either very narrow or very expensive to carry out, and pairs safeguards with active monitoring to catch attacks quickly.
Fable 5 Cleared Thousands of Hours of Red-Teaming Before Launch
Before Fable 5 went live, Anthropic ran an extensive pre-launch safety program. The company worked with the US government, the UK AI Safety Institute, and multiple private third-party organizations to stress-test the model’s safeguards.
An external bug bounty program ran for over 1,000 hours of testing. It produced no universal jailbreaks. Anthropic also adopted a mandatory 30-day data retention policy for all Fable and Mythos traffic. The company acknowledged that this policy carries costs with enterprise customers who had existing zero-retention agreements.
The retention policy was designed to detect misuse patterns that only become visible across multiple user requests over time. Anthropic said it considers the tradeoff necessary for responsible deployment.
Anthropic CEO Statement Challenges Government’s Approach
Anthropic issued a public challenge to the government’s reasoning. CEO Dario Amodei and the company’s leadership said they disagree that a narrow, potential jailbreak justifies pulling a model deployed to hundreds of millions of users.
The company warned that applying this standard across the AI industry would effectively block all new frontier model launches. “Anthropic believes the government should have the ability to block unsafe deployments,” the statement said. However, the company called for a process that is transparent, fair, and grounded in verified technical facts.
Anthropic said it is working to restore access to Fable 5 and Mythos 5 as quickly as possible. The timeline for reinstatement remains unclear. The episode sets a significant regulatory precedent for how Washington may seek to control advanced AI systems going forward.
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FAQS
Q1: What are Fable 5 and Mythos 5?
A1: Fable 5 is Anthropic’s most advanced public AI model. Mythos 5 is the base model it runs on. Both were suspended on June 12, 2026.
Q2: Why did the US government suspend Fable 5 and Mythos 5?
A2: The Commerce Department cited national security concerns over a reported technique to bypass Fable 5’s safety protections.
Q3: Does the suspension affect other Anthropic models?
A3: No. Claude Opus, Sonnet, Haiku, and all other Anthropic models remain fully active.
Q4: When will Fable 5 and Mythos 5 return?
A4: Anthropic said it is working to restore access quickly but has not confirmed a return date.
Disclaimer:
This article is based on public information and statements made by Anthropic on June 12, 2026. It is meant to inform readers only. We urge readers to check the facts through official sources. Any quotes in this article belong to the people and companies who said them.
Sources
https://www.anthropic.com/news/fable-mythos-access
Luke Carlino is a seasoned Copywriter, Content Strategist, and Social Media Manager specialising in Mining, Finance, and Business journalism. With more than a decade of industry experience, he brings rigorous editorial standards and commercial acuity to every project.
