The U.S. government has lifted the Anthropic Mythos Fable export restrictions that forced the company to shut down its two most powerful AI models. Anthropic says it will start restoring access on July 1.
Commerce Secretary Howard Lutnick approved the rollback. Anthropic had agreed to “proactively detect and address security risks associated with the models,” the Financial Times reported. Anthropic confirmed the notice in a post on X. The company said it would share more details as the restoration rolls out.
How the ban started
The order traces back to June 12. That’s when Lutnick told Anthropic to suspend Claude Fable 5 and Mythos 5 access for every foreign national. The directive even covered Anthropic’s own non-citizen employees. Because it was so broad, Anthropic said it had no practical way to comply. So it pulled both models offline for everyone.
Amazon had flagged a jailbreak that could bypass Fable’s safety guardrails. That warning triggered the government’s national-security review. Anthropic pushed back at the time. It argued the same jailbreak technique worked against other public models too, including OpenAI’s GPT-5.5. Those models were not under the same export controls.
Mythos is Anthropic’s cybersecurity-focused model. It hunts for software vulnerabilities faster than human researchers can. Fable is the general-purpose version Anthropic opened to enterprise customers and paid subscribers. Its cybersecurity and biology queries get routed through extra safeguards automatically. During the shutdown, the government carved out one exception. It cleared Mythos for roughly 100 critical-infrastructure organizations working with Anthropic through Project Glasswing, before lifting the broader restrictions entirely.
What changes now
With the export controls gone, Anthropic can resume distributing Fable 5 and Mythos 5 without a license. But the arrangement comes with conditions. Beyond monitoring for security risks, Anthropic agreed to work with the government on safety standards for future models. It also agreed to report any malicious activity it detects.
Anthropic hasn’t published a technical explanation of how it closed the jailbreak that started this dispute. It’s also unclear whether the restored access will come with new usage limits. If you lost access to Fable 5 in June, don’t expect it back all at once. Anthropic is treating this as a phased restoration, not an instant switch flip.
