Claude Mythos Security Testing: Anthropic's AI Safety Harness

What Is Claude Mythos Preview?

Claude Mythos Preview is Anthropic's security-focused model variant designed specifically for safety testing and red-teaming. It comes with specialized tools that help security professionals identify vulnerabilities in AI systems before deployment.

The Security Toolkit — What's Included

The toolkit includes skills for automated security task execution, a Claude harness that provides a sandboxed environment for controlled testing, and a threat model builder that systematically maps potential attack vectors. Together, these tools form a comprehensive AI security testing framework.

How Security Teams Can Use It

Start with the threat model builder to map your AI system's attack surface. Then use the harness to run controlled tests against identified vulnerabilities. The skills automate repetitive security checks, freeing your team to focus on complex threat scenarios that require human judgment.

Who Should Consider These Tools?

Any organization deploying AI systems that handle sensitive data, make consequential decisions, or interact with external users. This includes financial services, healthcare, government agencies, and tech companies building AI-powered products.

FAQ

Q: What is the Claude harness? A: A sandboxed testing environment that lets security teams safely probe AI model behavior without risk to production systems.

Q: Is Mythos Preview available to everyone? A: No, it's available to qualifying customers upon request through Project Glasswing.

Q: How does the threat model builder work? A: It provides a structured framework for identifying and categorizing potential security threats to AI systems, helping teams systematically assess risk.

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