When developers are allowed to use AI tools, they take 19% longer to complete issues
A study on early-2025 AI tools found that experienced open-source developers took 19% longer to complete tasks when using AI, suggesting AI may not yet enhance productivity. The research aims to understand AI's impact on software development and AI R&D.
"When developers are allowed to use AI tools, they take 19% longer to complete issues—a significant slowdown that goes against developer beliefs and expert forecasts. This gap between perception and reality is striking: developers expected AI to speed them up by 24%, and even after experiencing the slowdown, they still believed AI had sped them up by 20%.
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