I haven't used Claude, but Gemini has always returned better answers to general questions relative to ChatGPT or Copilot. My impression, which could be wrong, is that Gemini is better in situations that are a substitute for search. How do I do this on the command line, tell me about this product, etc. all give better results, sometimes much better, on Gemini.
But everyone is using them for different things and it doesn't always generalize. Maybe Claude was great at typescript or ruby or something else I don't do. But for some of us, it definitely was not astroturf for Gemini. My whole team was talking about how much better it was.
What are your usecases? Really not my experience, Claude disappoints in Data Science and complex ETL requests in python. O3 on the other hand really is phenomenal.
I can't speak to it now - have mostly been using Claude Code w/ Opus 4 recently.