GPT-5.5 vs Claude Opus 4.7 vs Gemini 3.1 Pro: The Frontier Model Showdown

Three flagship models. Three different labs. Three different bets on what production AI actually needs in 2026. GPT-5.5 dropped April 23, Opus 4.7 dropped April 16, and Gemini 3.1 Pro has been in developer preview since February 19. If you're building agents, coding tools, or any serious production