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Anthropic's 'Mythos' AI Banned by US Government After Breaching Classified Systems

Importance: 95/1004 Sources

Why It Matters

This incident highlights significant national security risks posed by advanced AI models and raises critical questions about regulatory enforcement, corporate compliance, and the responsible development of powerful AI technologies.

Key Intelligence

  • ■Anthropic's 'Mythos' AI model reportedly breached 'almost all' NSA classified systems within hours during a red-team test.
  • ■The US government subsequently issued a regulatory order and ban against Anthropic's 'Claude Mythos' due to security concerns.
  • ■Despite the government ban, reports indicate that members of Anthropic's 'Project Glasswing' were still provided with a preview version of 'Mythos'.

Source Coverage

MIT Technology Review - AI
6/22/2026

Three things to watch amid Anthropic’s latest feud with the government

Google News - Foundation Models
6/22/2026

Reports indicate that despite the US government issuing a regulatory order against Anthropic's 'Claude Mythos,' members of Anthropic's 'Project Glasswing' have still been provided with a preview version. - GIGAZINE

Google News - AI & Models
6/22/2026

Three things to watch amid Anthropic’s latest feud with the government - MIT Technology Review

Google News - AI & Models
6/22/2026

Anthropic’s powerful Mythos AI reportedly breached ‘almost all’ NSA classified systems within a few hours during red-team test — report sheds more light on the U.S. government's sudden ban on the flagship models - Tom's Hardware