Claude Mythos: Anthropic's Security-Focused AI Model Explained

On April 7, 2026, Anthropic announced Claude Mythos Preview鈥攁 specialized model designed for defensive cybersecurity workflows. It's Anthropic's most capable model for vulnerability discovery and security analysis.

What Makes Mythos Different

Specialized Training: Trained on security-specific data and workflows
83.1% on vulnerability reproduction benchmarks (vs 66.6% for Opus 4.6)
Defensive Focus: Designed to find and fix vulnerabilities, not exploit them
Invite-Only: Restricted to vetted security researchers and organizations

Project Glasswing

Mythos is part of Project Glasswing, Anthropic's initiative to provide specialized AI for critical infrastructure security. Partners include major cloud providers, financial institutions, and government agencies.

Important: Mythos is NOT available to the general public. Access requires application and vetting. This is intentional鈥攖he model is powerful enough to be dangerous in wrong hands.

Use Cases

Automated vulnerability scanning and analysis
Security audit report generation
Incident response and forensics
Penetration testing assistance (defensive)

How to Get Access

Organizations can apply through Anthropic's Glasswing portal. Requirements include:

Demonstrated need for security AI capabilities
Organizational security policies and controls
Agreement to usage restrictions and monitoring

For general-purpose AI coding, see our Claude Opus 4.7 review or the AI Toolkit Hub.