Best AI Code Reviewer in 2026? We Ran 4 in Parallel for 3 Weeks (146 PRs, 679 Findings)

Three weeks of side-by-side data across 4 AI code reviewers — CodeRabbit, Sentry Seer, Greptile, Cursor BugBot. 679 findings, 4.8× latency spread, one tool cut for pricing not quality. Full anonymized dataset + tooling open-sourced.