Anthropic's US headquarters, seen June 26. [AP]
Anthropic's US headquarters, seen June 26. [AP]

Anthropic has resumed global service for its AI model Claude Fable 5 after the US government lifted export controls on the model.

On Tuesday local time, Anthropic announced through its official account on X, formerly Twitter, that "Fable 5 is back."

Fable matches the performance of Mythos — a model known for its expert-level ability to detect security vulnerabilities — but includes safety guardrails that prevent it from responding to questions related to cybersecurity, biology, chemistry and other topics that could be exploited for hacking or weapons manufacturing.

Users can now access Fable 5 again through Anthropic's Claude, Claude Code and Claude Cowork platforms. Anthropic said Pro, Max, Team and enterprise subscribers can use Fable 5 from Tuesday through July 7 within up to 50 percent of their existing usage limits, after which additional access will require extra charges.

Fable 5 service will also resume soon on cloud platforms including Amazon Web Services, Microsoft Azure and Google Cloud.

In announcing the resumption, Anthropic also addressed the security concerns the US government had raised over "jailbreaking" and the steps it took in response. Anthropic said the jailbreaking technique in question had not exposed Mythos-level cyberattack capabilities, and that such techniques apply to other AI models beyond Mythos and Fable. Even so, Anthropic said it worked with the US government to improve the model so that more than 99 percent of the reported risky behaviors are now blocked.

While the lifting of US export restrictions has opened Fable 5 to the world, access to Mythos 5 outside the United States will remain difficult for now, Bloomberg reported Tuesday. The US government is strictly controlling access to Mythos 5, limiting it mainly to a small number of trusted American companies and institutions.

Anthropic had originally planned to expand Mythos 5 access to more than 150 institutions across 15 countries through a vulnerability-detection consortium called Project Glasswing, but is currently restoring access only for US-based partners. As a result, South Korean companies and institutions believed to be participating in Project Glasswing — including Samsung Electronics, SK hynix and SK Telecom — are expected to face further delays before they can use Mythos 5.


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