Back! Anthropic announced that Fable 5 and Mythos 5 will be relaunched as the U.S. Department of Commerce lifts export controls.

For the first time in history, the U.S. Department of Commerce imposed export controls on domestic cutting-edge AI models, forcing Anthropic's Claude Fable 5 and Mythos 5 to be shut down for 18 days. Anthropic announced this morning (1st) that they will be back online tomorrow.
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An export control order shut down the strongest U.S. AI model for 18 days, but now it is finally coming back online. This morning (1st) around 8 a.m., Anthropic's official X account announced that the Department of Commerce has lifted the export controls:

We have received notice that the Department of Commerce has lifted the export controls on Claude Fable 5 and Mythos 5. We will begin restoring access tomorrow and will share updates soon.

We thank our users for their patience and everyone who worked with us to redeploy the models.

We’ve received notice that the Department of Commerce has lifted export controls on Claude Fable 5 and Mythos 5.

We'll begin restoring access tomorrow, and will share an update soon.

We’re grateful to our users for their patience, and to everyone who worked with us on…

— Anthropic (@AnthropicAI) June 30, 2026

Anthropic Forced to Suspend Models

On June 12, 2026, the U.S. Department of Commerce's Bureau of Industry and Security (BIS) issued an unprecedented order to Anthropic: suspend access to Claude Fable 5 and Mythos 5 for "any foreign person," citing national security.

In simple terms, whether the user is inside or outside the U.S., as long as BIS suspects foreign identity, the model cannot be used by that user. Unable to reliably filter accounts by nationality, Anthropic simply shut down both flagship models entirely.

Why Were They Shut Down?

Two parallel security concerns triggered this order. First, partners like Amazon warned that the models were at risk of being "jailbroken"; second, Mythos 5 was reportedly released to a South Korean telecom company with ties to China.

This is the first time an AI model has been treated as a controlled export item like advanced chips. The extension of regulatory logic is happening much faster than outsiders expected.