We analyzed 40M PRs: Copilot overtook CodeRabbit as top AI reviewer

pullflow.com

3 points·zak-mandhro··3 comments

Author here.

Everyone's focused on AI writing code. But the shift to AI reviewing code moved faster - 1 in 7 active PRs now have an AI reviewer, up from 1 in 100 eighteen months ago.

A few things that surprised us:

- Copilot overtook CodeRabbit in November despite CodeRabbit being purpose-built for review - native GitHub integration matters more than we expected

- Gemini went from near-zero to #3 in 10 months (43X growth). Google isn't marketing this aggressively yet

- AI agents authored 99K PRs but participated in 5.9M -automation is still heavily weighted toward review, not generation

- Some early entrants like Korbit have already shut down

Data is GitHub Archive + our anonymized corpus. Happy to answer questions on classification or edge cases.

I met the Korbit founder and team at AI Dev World last year - smart, thoughtful group. The founder was deeply enthusiastic about their approach to PR analysis. They had a very academic, research-driven team behind the product, which showed in how rigorously they were approaching the problem. It was exciting work, and a good reminder of how much serious experimentation has been happening in AI code review over the past couple of years, even among teams that didn’t ultimately make it.

Yeah, with so much investment from the giants in this space, it's tough for startups to carve out a niche. Having said that, CodeRabbit has remained a strong contender against the platforms throughout 2025.

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