Claude Fable 5 returns to Anthropic’s product surface on Wednesday, July 1, roughly 19 days after the Commerce Department ordered the company to cut off both Fable 5 and Mythos 5 from any foreign national. The lift, dated June 30, closes an emergency episode that began June 12 and, more quietly, marks the first time a U.S. administration has used export controls as an ad-hoc oversight tool against a domestic frontier lab.

The trigger was a report by Amazon researchers describing a jailbreak that prompted Fable 5 to identify software vulnerabilities and, in one instance, produce code demonstrating exploitation. Anthropic doesn’t dispute the finding so much as its framing: the same technique, the company notes, works on weaker models including its own Claude Opus 4.8, OpenAI’s GPT-5.5, and China’s Kimi K2.7. The fix shipping alongside the redeployment is a new safety classifier that blocks the specific method in more than 99% of attempts, with blocked requests silently rerouted to Opus 4.8.

Fable 5 will count for up to 50% of weekly usage limits on Pro, Max, Team, and select Enterprise plans through July 7, after which it moves to a usage-credit model.

Mythos 5, the more capable sibling, isn’t coming back the same way. Access was restored on June 26 to roughly 100 U.S. companies and federal agencies defending critical infrastructure, gated by a Commerce letter viewed by CNBC in which Secretary Howard Lutnick determined that “appropriate safeguards” now permit “trusted partners” to use it. Everyone else remains outside.

The political texture is worth reading closely. Negotiations were reportedly led by co-founder Tom Brown, not Dario Amodei, whose relationship with the administration has been visibly strained. The crackdown was drawing criticism from tech executives and investors who argued it was gifting weeks of runway to Chinese open-source developers. And the June 2 executive order that created a voluntary frontier-model review path was never invoked here; Commerce improvised with export authority instead.

That last detail is the structural story. A voluntary review regime exists on paper. When the government actually wanted to intervene, it reached past the regime and pulled an export lever built for a different century’s technology.

Sources