Claude Mythos is too dangerous for public consumption...

Fireship breaks down Anthropic’s Mythos model — withheld from public due to zero-day discovery capabilities that alarmed US Treasury and Fed.

• Mythos found a 16-year-old FFmpeg vulnerability enabling malicious video files to corrupt memory and crash programs.
• It discovered a 27-year-old OpenBSD bug allowing remote null-pointer crash over TCP without authentication.
• Mythos found JavaScript engine bugs in every major browser enabling sandbox escape, kernel writes, and cross-site data theft.
• A Linux kernel bit-flip exploit let it overwrite the passwd binary to gain full root access.
• US Treasury Secretary Bessant and Fed Chair Powell held an urgent meeting with bank CEOs about Mythos security risks.
• Anthropic’s Project Glass Wing gives Mythos access only to large paying partners to patch critical software before wider release.
• Skeptics note: the OpenBSD find required ~1,000 parallel agent runs costing $20k; the 84% Firefox exploit rate was against a sandbox-disabled spidermonkey shell, not real Firefox.

2026-04-10 · Watch on YouTube