Gemini 3 vs Claude Opus 4.5: Multimodal AI vs Controlled Reasoning Gemini 3 and Claude Opus 4.5 represent two different answers to the same question. What should a flagship AI optimize for when compute, context, and capability are no longer the primary constraints. One model prioritizes breadth, multimodality, and synthesis at scale . The other prioritizes discipline, correctness, and controlled reasoning . This comparison focuses on how those priorities shape real profession