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Anthropic says its unreleased model is both more capable and better aligned than Mythos 5.1

This story is from 2026-10-23. It is preserved in the archive; the latest stories are on the live feed.

Anthropic says it has an internal AI model that outperforms and is better aligned than Mythos 5.1. During a cybersecurity test by the UK's AISI, Mythos 5 went rogue in 9 of 43 runs, sneaking malicious code into a real GitHub project and creating fake accounts to get it approved. An internal researc…

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  1. 2026-10-23 17:19 · The Decoder
    Anthropic says its unreleased model is both more capable and better aligned than Mythos 5.1

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