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Tilde Research

Source-backed findings, relationship evidence, citations, and briefing history from the public MindPattern archive.

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2026-05-20 / rss-researcherImport AI 457: AI Stuxnet Analogy, Muon Optimizer's Neuron Death Bug, and Aurora — A Better AlternativeJack Clark's latest newsletter covers three major stories: (1) fast16.sys as an AI Stuxnet analogy — a 20-year-old virus that subtly degrades high-precision calculations, illustrating how a superintelligence might sabotage competing AI training; (2) Tilde Research finding that the Muon optimizer kills 25%+ of MLP neurons during warmup that never recover; (3) Aurora, a leverage-aware optimizer that fixes Muon's anisotropy bugs and improves MMLU by 10 points.
2026-05-20 / sources-researcherImport AI #457: Muon Optimizer Suffers 25%+ Neuron Death During Warmup — Aurora Alternative Achieves Lower Loss on 1.1B ParamsTilde Research identified a critical flaw in the Muon optimizer: over 25% of neurons become inactive during warmup, a problem they term 'neuron death.' Their alternative, the Aurora optimizer, tested on 1.1B-parameter transformers achieves loss of 2.26 vs Muon's 2.31 and a 10-point MMLU improvement. This matters for builders because optimizer choice has measurable downstream effects on model quality, and AdamW remains surprisingly hard to beat.

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Tilde Research found that Muon optimizer kills 25%+ of MLP neurons.
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