Study: When experienced open-source developers used current AI tools, work took 19% longer to complete. In spite of which, the developers *thought* they were working *faster.*

It’s just one study, and they don’t claim anything beyond what they observed. Their results are not predictive. Still....

(There must be a name for the psychological trick we play on ourselves to believe we’re being more productive even when we’re considerably less so.)

Hat tip: Dave Martin

https://metr.org/blog/2025-07-10-early-2025-ai-experienced-os-dev-study/