I have been using Claude for a while now. I find that on general it is on-par with GPT-4. Right now I'm only using the Chat and I use it for content creation as I find it outperforms GPT-4 in this regard. However, GPT-4 typically does a better job with problem solving, strategy, and coding. The best I have found is a combination. For example, giving GPT and outline for a blog, having Claude write it, then having GPT-4 suggest edits, and Claude to adopt the recommended edits. I am considering to use the API as well for an aspect of our tech stack, namely because of the 100k context limit and no restriction I have with GPT-4, but this is still TBD.