Having used a half dozen AI’s or more Grok is the best.
I find they each have their strong and weak points. Grok is far and away the best at Politics and not being woke. No other Agent is up on current events better than Grok by a long shot. I found out yesterday Chat GPT is useless at diagnosing car issues. It pursued a mechanical vector and didn't stray. It never considered something electronic like a simple blown fuse. Claude was pretty good at it, but acted like a tutor when I just needed answers. Claude is far and away the best at code in my experience. Gemini is my chronicling go-to and the best at middle of the road everyday stuff (documentations and such). Gemini is also a good shopper. The Gemini Notebooks are awesome for highly pointed areas of expertise. I don't know why anyone uses Chat GPT, it sucks at everything. Copilot I kinda use as a search engine more than anything else. I use it for quick facts.
I absolutely love Grok! Currently, using it to plan a trip in October. Saves me so much time in online research.