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AI coding assistants: 55.8% faster or 19% slower? Both are right

This story is from 2026-09-21. It is preserved in the archive; the latest stories are on the live feed.

Two headline studies on AI-assisted development contradict each other: Microsoft/GitHub/MIT (2023): 55.8% faster METR (2025): 19% slower Both are accurate. They measure different tasks, different developers, and different definitions of "faster". Where the speedup is real The 55.8% came from a sing…

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  1. 2026-09-21 08:12 · DEV Community — AI
    AI coding assistants: 55.8% faster or 19% slower? Both are right

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