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

Technology · en

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

The Decoder · Oct 23, 2026, 5:19 PM UTC

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.…