Anthropic’s long-sidelined Fable 5 is greenlit to return

After weeks of negotiating with the Trump administration, Anthropic is finally going to be able to bring Claude Fable 5 back online. In a post on X, Anthropic said it plans to begin restoring access Wednesday to users globally on Claude platforms, and that the company would re-enable access on AWS, Google Cloud, and Microsoft Foundry soon, but with no set timeline.

Anthropic wrote:

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 redeploying the models.

The company also published a blog post on Tuesday evening detailing the lead-up to the events in question, its revised safeguards, new AI industry processes it’s working on, and new ways it plans to share information with the government, as well as prerelease testing for upcoming models.

In early June, Anthropic sidelined Fable 5 — its consumer-facing model built from the same underlying technology as Anthropic’s Mythos 5, but with more safeguards — after a Friday evening ultimatum from the Trump administration. Due to concerns over potential jailbreaks of the technology, the government had slapped Anthropic with an export control directive, disallowing any foreign national (including non-US members of enterprise client companies and even many of Anthropic’s own employees) from using either Mythos 5 or Fable 5, i.e., both the models that Anthropic had spent the last week hyping.

To address the jailbreak in question, which Amazon researchers had flagged and was largely responsible for setting the export control directive into motion, Anthropic said in the blog post that it had “trained an improved safety classifier that targets and blocks” that behavior, adding, “Users will be notified if a request to Fable 5 is blocked, and the request will instead be sent to Opus 4.8.