In my experience*, for coding, Sonnet is miles above any model by OpenAI, as well as Gemini. They're all far from perfect, but Sonnet actually "gets" what you're asking, and tries to help when it fails, while the others wander around and often produce dismal code.

* Said experience is mostly via OpenRouter, so it may not reflect the absolute latest developments of the models. But there at least, the difference is huge.