US Orders Anthropic AI Model Ban

The US government ordered Anthropic to suspend access to its Fable 5 and Mythos 5 AI models at 5:21 p.m. ET on June 12 , forcing the company to disable both products for all customers worldwide. The move appears to be the first time a leading AI company has taken a publicly deployed model offline due to federal government intervention .

The unprecedented recall came just three days after Fable 5 launched . Commerce Secretary Howard Lutnick sent a letter to Anthropic CEO Dario Amodei stating that the Mythos 5 and Fable 5 models would be subject to export controls to any location outside of the U.S. and to all foreign persons within the country , according to reporting from Reuters and Axios.

Why Did the Government Act Now?

Anthropic's understanding is that the government believes it has become aware of a method of bypassing, or "jailbreaking" Fable 5 . The Commerce Department acted after another company claimed it could jailbreak Mythos, alarming the administration about national security risks , Axios reported.

Anthropic reviewed a demonstration of this specific technique being used to identify a small number of previously known, minor vulnerabilities . The company said the jailbreak essentially asked the model to read a codebase and fix software flaws, a capability it said is "widely available from other models, including OpenAI's GPT-5.5" and routinely used by security teams.

The letter did not provide specific details of its national security concern , leaving Anthropic to piece together the government's reasoning from verbal descriptions.

The Technical Problem: No Way to Filter by Nationality

The directive suspends 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 this order is that Anthropic must abruptly disable Fable 5 and Mythos 5 for all customers to ensure compliance .

Because Anthropic cannot reliably distinguish foreign nationals from domestic users in real time, the practical result is a hard shutoff of both models for every customer worldwide . Access to all other Anthropic models will not be affected .

What Are Fable 5 and Mythos 5?

On June 9, Anthropic launched Claude Fable 5, the first publicly available version of its Mythos model . Mythos-class models are a tier of Claude models that sit above Anthropic's Opus class in capability, with the first, Claude Mythos Preview, released in April through Project Glasswing, followed by Claude Fable 5 and Claude Mythos 5 .

Fable 5 is the public-facing version, with safety classifiers that route flagged requests to the weaker Claude Opus 4.8, while Mythos 5, the same underlying model with cyber safeguards lifted, was restricted to vetted cybersecurity defenders and critical infrastructure operators . The models built on the release of Claude Mythos Preview, which captivated Wall Street and government officials with its advanced cybersecurity capabilities in April .

Anthropic Pushes Back

Anthropic complied but pushed back publicly, calling the action disproportionate and warning it would halt all frontier model deployments if applied industry-wide . "We disagree that the finding of a narrow potential jailbreak should be cause for recalling a commercial model deployed to hundreds of millions of people," Anthropic wrote, adding "If this standard was applied across the industry, we believe it would essentially halt all new model deployments for all frontier model providers" .

In the weeks leading up to the launch of Fable, Anthropic worked with the US government, the UK AISI, multiple private third-party organizations and internal teams to red-team Fable's safeguards for thousands of hours in total, with tests showing that Fable's safeguards are substantially more effective than those of any previously deployed model .

As recently as Wednesday, Anthropic had called for greater US oversight of AI, including the ability to block models with unacceptable risks, but said the government action on Friday did not follow principles of fair and fact-based regulation .

A Fraught Relationship With Washington

This directive is the latest chapter in a turbulent relationship between Anthropic and the Trump administration. In February, President Donald Trump and Defense Secretary Pete Hegseth moved to bar Anthropic's products from federal agencies after the company sought stronger guardrails on how the Pentagon used its technology .

After negotiations between the two organizations collapsed, the DOD declared Anthropic a supply chain risk, meaning the company purportedly threatens U.S. national security—a label historically reserved for foreign adversaries that requires defense contractors to certify that they will not use Anthropic's Claude models in their work with the military . On March 9, 2026, Anthropic filed lawsuits in two federal courts challenging the designation .

The same administration that branded the company a security risk has also urged banks to adopt its technology and authorised the NSA to keep using Mythos on classified networks , highlighting contradictions in the government's approach.

What Changed This Week

The Commerce Department used export control authorities to force an immediate shutdown of two advanced AI models over reported jailbreak vulnerabilities that Anthropic characterizes as minor and already discoverable in competing systems. The company disabled both models for all users worldwide because it cannot technically distinguish foreign nationals from US citizens in real-time. Anthropic is working to restore access but has provided no timeline, while litigation over the earlier supply chain risk designation continues.

What to Watch

Anthropic says it believes this is a misunderstanding and is working to restore access as soon as possible , though no timeline has been provided. The company's ongoing litigation challenging its supply chain risk designation could set precedents for how the government regulates AI companies. Anthropic confidentially filed for a US IPO last month, edging ahead of rival OpenAI in the race to reach public markets , making the resolution of this dispute particularly consequential for the company's future.

The broader question is whether this sets a precedent for AI regulation. If the precedent holds, any frontier AI model could face a similar recall over a single reported jailbreak, regardless of severity—a prospect likely to send a chill through an industry that has spent the past year racing to deploy increasingly capable models with growing government scrutiny .

Reporting based on coverage from Anthropic, Bloomberg, NBC News, Reuters, CNBC, The Verge, Fortune, Axios, TechCrunch, June 12-13, 2026.