AI speeds up coding, but human code review becomes the bottleneck

A Harvard study found AI boosts code output by 30%, commits by 20% and pull requests by 23%, yet completed software shows no significant gain. Review time rose from 7 to 10.5 days and comments per pull request jumped 35%.

• Code output up 30%, commits up 20%, pull requests up 23%
• Pull request review time rose from 7.03 to 10.48 days
• Reviewer comments per pull request increased 35%
• No statistically significant gain in completed software