GPT-6, AI Comparison, Claude 4.7, Gemini 3.1 GPT-6 vs Claude 4.7 vs Gemini 3.1: AI's Three Kingdoms in April 2026—Which One Deserves Your Money? April 2026 head-to-head comparison of AI's big three: GPT-6, Claude Opus 4.7, and Gemini 3.1 Pro. Fr