Study says coding agents increase review time by 49%
A study cited by Ars Technica finds that coding agents increase code production, but the average time between submitting and merging a pull request rises 49%, absorbing part of the efficiency gain in human review.
According to the study described by Ars Technica, introducing coding agents increased the average time between a pull request’s submission and its merge by 49%. The share of pull requests receiving change requests nearly doubled, comments per request rose 35%, and the share of workers performing reviews increased 14%. The researchers could not attribute significant employment changes to AI.
Although 80% of the firms measured were using some form of AI code review by March 2026, agents accounted for just 23.3% of review comments and 10.8% of pull requests. The study indicates that humans still perform most reviews, creating a bottleneck that can offset the speed gains from generating code.
Why it matters · editorial interpretation
For teams adopting coding agents, faster code generation may come with more human review work. The finding suggests that measuring production speed alone can underestimate bottlenecks in the pull-request workflow.
Sources: Ars Technica