Fable 5 ban enters second week as NSA testimony, Android sighting pull restoration in opposite directions

Nine days after Commerce ordered Anthropic to disable Claude Fable 5 and Mythos 5 worldwide, the company's technical staff are meeting daily with officials while the underlying jailbreak dispute remains unresolved.

Nine days into the Commerce Department’s worldwide shutdown of Claude Fable 5 and Mythos 5, the dispute is no longer about a model. It’s about whether voluntary safety disclosure, of the kind Anthropic built its brand on, survives contact with the Export Control Reform Act of 2018.

The directive landed at Anthropic on Friday, June 12, at 5:21 p.m. ET, in a letter from Commerce Secretary Howard Lutnick to CEO Dario Amodei. A copy seen by Reuters cited export control authorities to bar access by any foreign national “whether inside or outside the United States,” warning of “prompt criminal and civil penalties” for noncompliance. Officials feared the models could be deployed by military intelligence users in China, Russia, or other countries of concern. Per an export control expert cited by The Globe and Mail, it’s the first time Commerce has wielded the 2018 Act against an emerging technology.

The trigger was Anthropic’s own disclosure. Fable 5 had shipped on June 9, deployed to hundreds of millions of users. Mythos 5 was already walled off under Project Glasswing, available to roughly 50 vetted organizations, after Anthropic said it had found vulnerabilities in every major operating system and browser it tested. The company then demonstrated a “narrow, non-universal jailbreak” that prompts Fable 5 to read a codebase and identify flaws. Commerce treated the demo as a national-security tripwire.

Anthropic disagrees, plainly: “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.”

The political backdrop is unkind. Trump ordered federal agencies off Anthropic models in February. The Pentagon labeled the company a “supply chain risk” in March, a designation Anthropic is challenging in federal court. Meanwhile GPT-5.5, Claude Opus 4.8, and frontier offerings from Google, Microsoft, Amazon, Apple, and Nvidia remain untouched.

On Sunday, more than 80 cybersecurity executives, including signatories from CrowdStrike and Adobe, urged Lutnick and National Cyber Director Sean Cairncross to lift the restrictions. Cairncross joined a working-level meeting at Commerce on Monday. Amodei and Lutnick are both expected at the G7 in Evian-les-Bains.

The lesson competitors are absorbing in real time: publish the red-team finding, lose the product.

Fable 5 ban enters second week as NSA testimony, Android sighting pull restoration in opposite directions

Sources