For coding and "reasoning" tasks, there isn't any that can match GPT4. You can try Bing but it is slightly nerfed in my experience.

For general writing, simple discussion, basic knowledge etc, Claude is pretty good. In fact, I find Claude's writing a lot better than GPT. It sounds more "normal".

For vision and API calls and developing apps and such, unfortunately, GPT is king and anything else pales in comparison.