US Government Orders Anthropic to Shut Down Fable 5 and Mythos 5

Anthropic’s most powerful AI models have been pulled from every customer on the planet — not by choice, but by government order.

On June 12, 2026, the US Commerce Department sent a letter to Anthropic CEO Dario Amodei directing the company to suspend access to Claude Fable 5 and Mythos 5 for all foreign nationals, whether inside or outside the United States. The models had been publicly available for just three days.

Because the order covers foreign nationals everywhere — including Anthropic’s own employees — the company said the only way to comply was to disable both models entirely for all users worldwide.

What Triggered the Order

The Commerce Department, led by Secretary Howard Lutnick, acted on concerns that a jailbreak method exists that could bypass Fable 5’s built-in safety systems. Reports indicate Amazon discovered the vulnerability in Mythos 5 and flagged it to the government.

Anthropic pushed back. The company said it received only verbal notice of a “potential narrow, non-universal jailbreak” and that after reviewing the technique, it found the vulnerability could only unlock a small number of previously known, minor capabilities in one specific instance — not defeat the model’s safety guardrails wholesale.

In its public statement, Anthropic called the shutdown a “misunderstanding” and said it is working to restore access.

Why This Matters

This is the first time the US government has used export controls to force an AI company to pull a commercially deployed model. It sets a significant precedent: frontier AI models may now face the same kind of export restrictions applied to advanced semiconductors and military technology.

For the hundreds of millions of users who had access to Fable 5 when it launched, the models are simply gone. The timing is especially notable given Anthropic’s rumoured IPO and its recent milestone of overtaking OpenAI in US business adoption, according to the Ramp AI Index.

What This Means for You

If you were using Fable 5, you have been automatically switched back to Claude Opus 4.8 or another available model. All other Claude models — including Sonnet 4.6 and Haiku 4.5 — remain fully available.

There is no timeline for when Fable 5 might return. If you depend on Claude for critical work, check which model your tools are using and test your workflows with the current options. Our ChatGPT vs Claude vs Gemini comparison can help you evaluate alternatives while the situation unfolds.

This story is developing. We will update this article as new information becomes available.