METR AI Coding Study: Experienced Developers Took 19% Longer

July 10, 2025

In a randomized trial on contributors' own repositories, METR found experienced developers using frontier AI tools took 19% longer while believing they had sped up.

METR

Sources

METR

Report · Jul 10, 2025

Measuring the Impact of Early-2025 AI on Experienced Open-Source Developer Productivity

Additional sources

arXiv

Paper · Jul 10, 2025

Measuring the Impact of Early-2025 AI on Experienced Open-Source Developer Productivity

The Register

News · Jul 11, 2025

AI coding tools make developers slower but they think they're faster, study finds

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