We Didn't Just Join โ€” We Tested It

MSRC + CTI-REALM: Microsoft's evaluation of Claude Mythos Preview
๐Ÿ”ฌ What MSRC Did
1 Anthropic gave Microsoft private early access to Claude Mythos Preview
2 MSRC tested it against CTI-REALM โ€” our own open-source benchmark for end-to-end detection rule generation
3 Result: "substantial improvements relative to prior models" in vulnerability discovery
4 Performance approaching experienced human security researchers โ€” but running 24/7
๐Ÿ”„ What Changes for Us

"We will discover a greater volume and diversity of vulnerabilities and address them earlier in the lifecycle before they create risk for customers."

โ€” MSRC Blog, Apr 7 2026
Process Impact

MSRC currently processes thousands of vuln reports/year. AI-scale discovery means 10x+ volume. Triage, validation, and coordination all need to evolve.

SFI + SDL Evolution

Secure Future Initiative and Secure Development Lifecycle were built for human-pace review. When AI finds vulns 24/7, the feedback loop from discovery โ†’ fix โ†’ prevention compresses from weeks to hours.

Sources: MSRC Blog ยท CTI-REALM Benchmark