The cleanest positive study is Cui et al., because it used randomized rollout in real companies. Developers at Microsoft, Accenture, and a Fortune 100 electronics manufacturer were randomly given access to an AI coding assistant. Pooled across 4,867 developers, the authors estimate a 26.08% increase in completed tasks among users. They also report increases in commits and builds.
While that research was published in 2026, it analyzed the 2023 period. Very much NOT sota models!
Thank you!