Anthropic is an AI safety and research company that's working to build reliable, interpretable, and steerable AI systems.
Anthropic’s Claude Mythos Preview is the clearest public sign yet that AI vulnerability research is moving faster than patching, disclosure, and validation workflows were built to handle. This piece separates what is publicly proven from what is still embargoed, walks through OpenBSD, FFmpeg, FreeBSD, and Linux kernel case studies, and lays out what defenders need to change now. (red.anthropic.com)
Claude Opus 4.6 discovered 22 Firefox vulnerabilities in two weeks, including 14 high-severity bugs, as nearly 20% of all critical Firefox vulnerabilities were fixed in 2025. The AI also wrote working exploits for two bugs, demonstrating emerging capabilities that give defenders a temporary advantage but signal an accelerating arms race in cybersecurity.
Table of Contents Intro Lore Why "Find All The Vulnerabilities" does not work Minimal Scaffolding That Actually Helps Case Study: Claude Opus 4...
For more than two decades, Firefox has been one of the most scrutinized and security-hardened codebases on the web. Open source means our code is visible,
Should I focus on my book or chase bug bounties?
Anthropic pointed Claude at the Firefox codebase and found 22 zero-days in two weeks. The capability gap between AI and widespread exploitation won't last. The window to prepare is now.
For more than two decades, Firefox has been one of the most scrutinized and security-hardened codebases on the web. Open source means our code is visible,
What does security look like in 5 years? Let's hang out in San Francisco and avoid badge scans, Opus 4.6 finds 22 vulns and auto-writes 2 exploits
Anthropic used Claude Opus 4.6 to identify 22 Firefox flaws, most of which were high severity, all of which were fixed in Firefox 148.