WSJ： The White House has blocked Anthropic's push to expand access to Mythos， Anthropic's new powerful model that can reportedly find and exploit software flaws at a level serious enough to trigger national-security controls.

The fight is about who gets to use a model that can help defenders patch bugs faster but could also help attackers find weak points across critical systems.

Anthropic wanted roughly 70 more companies and organizations added， which would have pushed total access to about 120， but officials argued that wider access raises security risk and could strain the compute needed by agencies already using it.

The dispute also shows that Anthropic's relationship with Washington is still tense， with military-use fights， staffing disputes， and broader distrust shaping who gets near the model.