# "Even “illegible” Mythos reasoning traces seem pretty legible" by faul_sname

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Text version: https://stenobird.com/podcast/lesswrong-curated-popular-5643401/even-illegible-mythos-reasoning-traces-seem-pretty-legible-by-faul-sname.md
Podcast: [LessWrong (Curated & Popular)](https://stenobird.com/podcast/lesswrong-curated-popular-5643401)
Published: 2026-06-11T08:15:43+00:00
Episode link: https://www.buzzsprout.com/2037297/episodes/19329842-even-illegible-mythos-reasoning-traces-seem-pretty-legible-by-faul_sname.mp3
Audio file: https://www.buzzsprout.com/2037297/episodes/19329842-even-illegible-mythos-reasoning-traces-seem-pretty-legible-by-faul_sname.mp3
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Duration seconds: 462

## Resource

The Claude Fable 5/Mythos 5 System Card has a section in which they talk about illegible reasoning, and provide an "extreme" example thereof. Models developing their own uninterpretable, unmonitorable internal language has been a major theoretical concern for a while, and when o3 was released last year with its disclaim overshadow disclaim vantage style word salad CoT, it seemed like the problem had become real and immediate. And yet, since o3, other model families have not appeared to hav...

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## Transcript

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