Research Shows AI Is Writing More Code, but Teams Still Lack Adequate Review Standards
Somewhere around late 2025, the research community quietly stopped asking whether AI can write code and started asking something harder: how does AI-authored code actually perform in real engineering workflows?
Not in benchmarks. Not in demos. In pull requests, code reviews, CI pipelines, and production codebases the same places we have been measuring human developers for decades.
The findings are specific enough to be useful and uncomfortable enough that most teams are not acting on them yet.
The Numbers That Reframe the Conversation
22% of merged code is now AI-authored, according to DX's Q4 2025 impact report covering 135,000 developers. That is not a future projection. That is the current baseline. One in five lines of code hitting your main branch today was written by an AI tool.
Daily users of AI coding assistants merge roughly 60% more PRs than non-users. That productivity gain is real and well-documented across multiple...
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