GPT-5.5 achieves superior CyberSecurity performance to Mythos
The new model finds more vulnerabilities than the one deemed 'too dangerous to release'.
Deep Dive
AISecurityInst is the group Anthropic released Mythos to, verifying claims it was "too dangerous to release." The author says they've used GPT-5.5 to find vulnerabilities—it's pretty good, but hardly "too dangerous." They recommend using it for code review, though you'll need Persona verification for security tasks.
Key Points
- GPT-5.5 outperformed Anthropic's Mythos on cybersecurity vulnerability benchmarks from AISecurityInst.
- Access to GPT-5.5 for security tasks requires Persona verification to prevent misuse.
- The model's performance undercuts Anthropic's claim that Mythos was 'too dangerous to release'.
Why It Matters
Debunks the 'too dangerous' narrative and provides a practical AI tool for real-world code vulnerability scanning.