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

Re:We analyzed 40M PRs: Copilot overtook CodeRabbit as top A... by zak-mandhro on Thursday December 18, 2025 @01:12PM (#46316333)

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.

[ Parent | on HN ]

Re:We analyzed 40M PRs: Copilot overtook CodeRabbit as top A... by amnaanwar on Thursday December 18, 2025 @02:38PM (#46317503)

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.

[ Parent | on HN ]

Re:We analyzed 40M PRs: Copilot overtook CodeRabbit as top A... by zak-mandhro on Thursday December 18, 2025 @03:43PM (#46318401)

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.

[ Parent | on HN ]