The Trump administration ordered Anthropic to restrict its most advanced cybersecurity artificial intelligence (AI) model on June 13, 2026, prompting the company to suspend access worldwide. Semafor reports that a China-linked group was suspected of gaining unauthorized entry to the system.
Key Takeaways:
The Trump administration issued export controls on June 13, forcing Anthropic to pull Mythos and Fable 5 globally.Semafor reports China-linked actors are suspected of accessing Mythos, raising reverse-engineering fears for U.S. security. Crypto platforms, including Coinbase, lose defensive AI access as Anthropic’s Project Glasswing faces an uncertain timeline.It remains unclear which specific organization was involved, how access occurred, or how the White House learned of it.
What Is MythosKey capabilities documented by Anthropic include:
Autonomous identification of thousands of high-severity zero-day vulnerabilities across major operating systems and browsers Discovery of a 27-year-old remote crash vulnerability in OpenBSD, used in critical infrastructure Chained Linux kernel exploits enabling full privilege escalation 83.1% accuracy on the CyberGym vulnerability reproduction benchmarkAnthropic estimated AI-accelerated attacks could compress what currently takes months of expert work down to minutes. Cybercrime already costs an estimated $500 billion annually worldwide.
Access was restricted to roughly 12 named corporate partners and 40-plus additional organizations through Project Glasswing, a defensive initiative designed to find and patch vulnerabilities before malicious actors could exploit them.
The Fable 5 JailbreakSacks said the administration “values Anthropic’s technical capabilities” and described the situation as “serious but easily resolved,” adding that “the ball is in Anthropic’s court.”
Anthropic disputed the severity of the jailbreak, stating it was narrow in scope and involved issues already present in other publicly available models. The company also stated the White House did not raise Chinese access concerns during direct discussions, which focused on Fable 5 and the bypass technique.
Why Crypto Platforms Are WatchingSecurity professionals who relied on the model’s vulnerability scanning capabilities now have no access path. That gap benefits any actor that may have already obtained a copy.
US-China AI CompetitionGermany’s cybersecurity officials have separately warned that Chinese AI providers appear to be reducing public updates while building Mythos-equivalent capabilities internally. China has the data center infrastructure and compute capacity to pursue that development path.
The suspension of Mythos and Fable 5 access remains in effect as of June 14, 2026. Anthropic has not announced a timeline for restoring service.
