GPT-5.5 vs Opus 4.7 Tested

In 2026, choosing the right AI model matters more than simply using the newest one. GPT-5.5 and Opus 4.7 are both powerful coding models, but they behave very differently when tested on real product tasks. We look at: - Speed - Visual design - Interaction logic - Output quality - Token usage - Estimated cost This is not a benchmark-only comparison. It’s a practical look at how GPT-5.5 and Opus 4.7 perform when you actually ask them to build real things.