Gemini 3 vs Claude Opus 4.5: Document Analysis and Reasoning Depth Document-heavy professional work exposes differences between AI models more clearly than almost any other category of tasks, because reading, interpreting, and reasoning over long and complex texts requires not just scale, but judgment, restraint, and internal consistency over time. Gemini 3 and Claude Opus 4.5 both position themselves as capable long-context systems, yet they embody two fundamentally differen