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13 of 14 Models Write Messier Code Than the Human Who Fixed the Same Bug

This story is from 2026-09-06. It is preserved in the archive; the latest stories are on the live feed.

We measured whether AI-written code is messier than human-written code, across 500 real bugs where a human fix already exists. Thirteen of the fourteen models we tested raised a function's complexity or added dead code more often than the person who fixed the same bug. One tied. None did better. We…

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  1. 2026-09-06 16:22 · DEV Community — AI
    13 of 14 Models Write Messier Code Than the Human Who Fixed the Same Bug

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