IC Technology & Surveillance — 2026-06-24

Parts of NSA Lose Mythos 5 Access After White House Imposes Export Limits on Anthropic

BLUFNSA will likely operate without frontier Anthropic model access through late October, degrading the agency's ability to red-team AI-enabled cyber threats at a period of accelerating risk.

Parts of the NSA lost access to Anthropic's Mythos 5 model on Friday after the Trump administration imposed export controls on Anthropic this month, Defense One and Nextgov/FCW reported, citing two people familiar with the matter 12. The agency may retain access to earlier model versions under prior arrangements; the terminated access had come through Project Glasswing, an April program giving select security researchers early access to Mythos Preview 12. Semafor reported, citing a person familiar with the matter, that the controls stemmed partly from suspicions a China-linked group had accessed Mythos 3. Trump adviser David Sacks separately said Amazon CEO Andy Jassy alerted the administration to a Fable 5 jailbreak that Anthropic CEO Dario Amodei declined to fix, an account Anthropic disputed by stating the White House never raised Chinese access in those conversations 3.

Analysis
NSA is likely to remain without Mythos 5 through late October. Three overlapping barriers make concurrent resolution improbable: the unresolved Chinese-access allegation, the disputed jailbreak account, and Anthropic's active Pentagon lawsuit. High confidence rests on two independently sourced primary reports confirming the termination, with named actors on both sides publicly committed to irreconcilable accounts. The access loss reverses the May procurement push that was designed to preserve that capability. The termination may instead reflect political leverage over Anthropic's litigation posture rather than a response to a verified intelligence breach. NSA and CYBERCOM face a materially different cost and lead-time calculus depending on whether they stand up alternative frontier AI contracts or wait on restored access.

3 sources

Parts of NSA lose Mythos 5 access after White House imposes limits - Defense One
Parts of NSA lose Mythos 5 access amid Anthropic supply chain dispute - Nextgov/FCW
White House move to limit Anthropic linked to concerns about Chinese access to Mythos - Semafor