AI Agents Now Start 4 in 10 Pull Requests on GitHub. The Bottleneck Has Moved to Review

A long line of white paper folders on a conveyor belt leading to a small wooden desk with a brass lamp and a magnifying glass
GitHub’s Octoverse 2026 says more than 40% of pull requests in September started with an AI agent’s first draft, up from 17% in March. What GitHub actually counted, why a 90% merge rate is not a quality score, what Copilot code review Max, approvals and Fusion cost, who answers for agent code that ships, and what it means for companies and developers.
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