Anthropic Just Built a Model Too Dangerous to Release. They Called It Mythos.

Today Anthropic announced Project Glasswing — and with it, a model they refuse to make generally available. Claude Mythos finds vulnerabilities that good. The claim isn't hype. In their own testing, Mythos wrote a browser exploit that chained four vulnerabilities together. It achieved local privilege escalation on Linux through subtle race conditions. It crafted a remote code execution exploit on FreeBSD's NFS server by splitting a 20-gadget ROP chain across multiple packets. Opus 4.6 managed near-0% success rate on autonomous exploit development. Mythos hit 181 out of 200+ attempts on the same benchmark. The Numbers That Matter $100M in usage credits for trusted partners $4M direct donations to open-source security orgs Partners include AWS, Apple, Microsoft, Google, and the Linux Foundation Vulnerabilities found in every major operating system and web browser One OpenBSD bug had been there 27 years Why This Is Different We've been hearing about AI security research for a while. But t