Gemini 3, an advanced model for code-related tasks, transcends mere patch writing by constructing comprehensive arguments for each change, earning it the moniker "the dense engineer" for its detailed and precise reviews. Unlike other models, Gemini 3 fills its reviews with preconditions, reasons, and causal relationships, creating a technical brief-like structure that is clear and confident, often resembling a senior engineer's work. Evaluated using CodeRabbit's benchmark across multiple programming languages, Gemini 3 excels in detecting concurrency and system accuracy issues, often explaining the "why" of bugs and offering concise fixes. Although its assertive tone may sometimes overstate the importance of minor issues, its high information density proves invaluable for understanding complex systems and uncovering subtle defects. This model is particularly effective where concurrency, resource management, and in-depth analysis are critical, providing insightful comments that serve as both educational content and practical guidance, even when not entirely correct.