Anthropic’s newest artificial intelligence model, Claude Fable 5, was supposed to mark a major milestone for the company. Launched on June 9, the model was described by Anthropic as the most capable AI system it had ever made available to the public. Three days later, however, it disappeared.
On June 12, Anthropic announced that it had disabled access to both Claude Fable 5 and its more powerful sibling, Claude Mythos 5, after receiving a US government directive citing national security concerns. The order effectively forced the company to suspend access globally, making Claude Fable 5 one of the shortest-lived frontier AI releases in the industry’s history.
According to Anthropic, the directive was issued under export-control authorities and targeted access by foreign nationals. The company said it received the order at 5:21pm Eastern Time and immediately began shutting the models down to comply. While the government has not publicly detailed its concerns, Anthropic says officials were worried about a potential method for bypassing the safeguards built into Fable 5.
Also Read:Claude Mythos Preview: When AI Turns Fraud Into an Industry of Fear
Understanding Mythos 5 and Fable 5
To understand why the suspension attracted so much attention, it is important to understand the relationship between Mythos 5 and Fable 5.
On June 9 itself, Anthropic also launched Claude Mythos 5 but the launch was not meant for the general public. In Anthropic’s own words, the launch of Claude Mythos 5 was only “for a small group of cyberdefenders and infrastructure providers”.
Anthropic developed Claude Mythos 5 as part of a restricted programme known as Project Glasswing, giving access only to a small group of vetted organisations. According to multiple reports, participants included major technology companies, cybersecurity firms and selected government partners. Claude Fable 5 was built on the same underlying technology but was designed for wider public use. Anthropic added additional layers of safeguards intended to prevent misuse in areas such as cybersecurity, biology, chemistry and model distillation. When those safeguards detected a potentially sensitive request, the system was designed to redirect the query to th
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