I don't think they're actually the same thing, I definitely feel like Claude is much better with code than ChatGPT is so there are clearly differences in the capabilities of these models. One analogy that I find helpful here is the idea that these AIs are like animals. Just like there are animals of the same family (meaning they're genetically related to some degree) they still adapt to different niches. I see all these AI companies ultimately creating models analogous to that.

Some AIs will be good at coding (perhaps in a particular language or ecosystem), some at analyzing information and churning out a report for you, and some will be better at operating in physical spaces.