For chatting and getting informations, and be corrected on things you're wrong without being reprimended by your own tool, GPT 5.5/5.6 is way better. Gemini 3.1 pro is surprisingly good at verifying your stuff, even though it's always making mistakes about its own stuff (don't ask him question, but ask him to verify your answer to the question).

Same for graphics, visual consistency, anything around the "does the look make sense and is pleasing" really, which makes claude design such a (good) surprise, I hope very hard for a Codex equivalent. And Gemini "gets" graphics.

Claude is definitely a code and cowork tool first, that's where it shines.