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Muon doesn't replace AdamW. Every Muon run still has AdamW in it.

This story is from 2026-09-14. It is preserved in the archive; the latest stories are on the live feed.

Muon gets written up as the optimizer that finally beats AdamW. Reading Keller Jordan's original post, that framing falls apart in the first section — and what's actually going on is more interesting. It was never meant to cover the whole model Here's the definition, from the post that introduced i…

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  1. 2026-09-14 04:00 · DEV Community — Machine Learning
    Muon doesn't replace AdamW. Every Muon run still has AdamW in it.

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