Anthropic's frontier model "Claude Mythos Preview" remains available to roughly 200 selected organizations participating in Project Glasswing, even after a US Commerce Department export-control order halted wider access.
June 13, 2026 · Anthropic · Project Glasswing
Cut off by Washington, kept on for defense: ~200 orgs still have Mythos
After a US export-control directive halted broad access to Anthropic's frontier models Fable 5 and Mythos 5, roughly 200 early organizations in the defensive-cybersecurity program Project Glasswing reportedly retained access to the Claude Mythos Preview.
~200
orgs retaining Mythos Preview access across 15+ countries
10,000+
high-severity & critical flaws found in 1,000+ open-source projects
$100M
in usage credits, plus $4M donated to open-source security
CyberGym benchmark — vulnerability reproduction
Higher is better. Mythos Preview vs the prior Claude model.
66.6%
Claude Opus 4.6(prior model)
83.1%
Mythos Preview(73% expert-task success)
Decades-old flaws the AI surfaced
27 yrs
Remote DoS flaw unaddressed in OpenBSD
16 yrs
FFmpeg bug missed by 5M automated tests
Linux
Multiple kernel chains enabling privilege escalation
Defenders' case
The window from discovery to exploitation shrinks "from months to minutes" — defenders must wield the same capability. Seen as a "trusted sidekick" amid a severe shortage of security experts.
Washington's concern
Cited foreign-national access, jailbreak risk and technology leakage. May set a precedent for tighter export controls on frontier AI — limiting public verification.
The tension in one line
An export order shut the frontier model to the wider world for national-security reasons — yet the same model keeps running for ~200 defensive partners, because the capability that worries regulators is the capability defenders say they need.
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