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LLM-as-a-Judge Position Bias: Swap A and B and the Winner Flips

This story is from 2026-09-18. It is preserved in the archive; the latest stories are on the live feed.

My new prompt beat the old one 63 to 37. I had the chart ready for the team channel. Then, mostly out of paranoia, I reran the exact same eval with one change: the new prompt's answer went in slot B instead of slot A. Same 200 questions, same judge model, same rubric. The new prompt now lost. Nothi…

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  1. 2026-09-18 05:03 · DEV Community — Machine Learning
    LLM-as-a-Judge Position Bias: Swap A and B and the Winner Flips

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