Study shows developers using AI tools took 19% longer to complete their tasks
METR.ORG
AI CAPABILITIES
SUMMARY

A study observed the effects of early 2025 AI tools on the productivity of experienced open-source developers. Contrary to expectations, using AI tools slowed down experienced developers by 19% when completing tasks. Developers thought AI would save them time (predicting a 24% speedup before the study and 20% after), but instead, tasks took longer when AI was used. Experts in machine learning and economics also overestimated AI’s benefits, predicting it would speed things up.

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