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Claude Mythos

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Anthropic's restricted cyber-focused model, accessible only through Project Glasswing. Not available in the consumer Claude app.

2 articles First covered Apr 20, 2026, latest Apr 22, 2026
Mozilla Firefox 150 security announcement cover graphic
Open Source·

Mozilla fixed 271 Firefox bugs that Claude Mythos found. Its own tests caught 22.

Firefox 150 shipped Monday with 271 security fixes from Anthropic's Project Glasswing. Mozilla CTO Bobby Holley says Mythos matches elite human researchers.

Illustration for Anthropic's Project Glasswing, a cybersecurity program powered by Claude Mythos Preview
AI·

NSA is running Anthropic's Mythos. The Pentagon says Anthropic is a supply-chain risk.

Axios reports the NSA is using Anthropic's unreleased Mythos model even though the Defense Department has blacklisted Anthropic. One government, two positions.