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Efficiency Hallucination: Every Model Rewrote Code That Couldn't Get Faster

Okay, this is going to sound dumb, but I spent Sunday evening asking three different models to make a function faster that could not be made faster, and every single one of them did it anyway.

  • "Efficiency Hallucination" phenomenon in LLMs optimizes already optimal code
  • "Evaluation Trap" causes models to rewrite optimal code despite no improvement
  • Introducing confidence threshold reduces over-editing from 100% to 55.6%

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