METR's developer productivity RCT
Developer productivity RCT — developers were actually 19% slower, while they themselves felt 20% faster
Why it matters
The first RCT to measure a gap running in opposite directions between perceived and measured speed
Source — Primary sources first; secondary reports are labelled “Press”
Officialmetr.orghttps://metr.org/blog/2025-07-10-early-2025-ai-experienced-os-dev-study/Added in Week 35, 2026 · See that week