GPT-5.1 has been integrated into CodeRabbit's workflow to enhance code review processes by delivering higher precision and a better signal-to-noise ratio with fewer comments. The model is described as stable, instruction-following, and adaptive, excelling in balancing brevity and clarity while maintaining a confident, peer-like tone. Evaluations showed that GPT-5.1 matched the highest error pattern recall with fewer comments, surpassing competitors in per-comment precision and delivering impactful reviews. Despite some trade-offs, such as less attention to contextual hygiene notes, GPT-5.1's concise, pragmatic, and context-aware feedback improves the review experience by focusing on essential issues without overwhelming developers with unnecessary details. The model has been tuned for GitHub diff behavior, verbosity, and scoring, and its performance will be monitored to expand its availability based on user feedback.