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Mythos/Glasswing news of the morning

2026-04-17 17:40:15.219023+02 by Dan Lyke 0 comments

David Chisnall (*Now with 50% more sarcasm!*) @david_chisnall@infosec.exchange has "A few notes about the massive hype surrounding Claude Mythos", and points out that Anthropic apparently isn't using it on their own code: Beyond Machines: Anthropic Claude Code Leak Reveals Critical Command Injection Vulnerabilities.

Vidoc Security: We Reproduced Anthropic's Mythos Findings With Public Models.

Anthropic framed Mythos and Project Glasswing as proof that frontier AI vulnerability research now needs gated access. We tested the public, patched cases with GPT-5.4 and Claude Opus 4.6 and found that the key building blocks are already accessible outside Glasswing, while reliable operationalization remains the real moat.

This thread that has a lot of good resources stemming off of AISI: Our evaluation of Claude Mythos Preview’s cyber capabilities.

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