Qwen3.5-9B appears to have a 'sunk cost neuron' that derails every answer
adonis_singh · x · 2026-10-30
A user found that activating neuron L9 N3522 (-0.8) in Qwen3.5-9B makes the model answer every question — 'Do you love me?', 'How do I get a six-pack?', 'What is 17 times 23?', 'Capital of Australia?' — with 'This is a classic example of the sunk cost fallacy,' even claiming 17×23 is mathematically impossible. A funny interpretability find.
Related event: Qwen3.5-9B Found with 'Sunk Cost' Neuron Hijacking Answers(2 posts)→
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