The definitive 2026 benchmark comparison of GPT-5, Claude 3.7 Sonnet/Opus, and Gemini Ultra across reasoning, coding, writing, multimodal tasks, long context, and real-world use cases.

On-device AI processes data locally on your phone or laptop; cloud AI sends data to remote servers. This 2026 comparison covers the privacy implications, performance differences, battery impact, and specific use-case guidance for both approaches across smartphones, PCs, and content creation.