I've only used DuckDuckGo's implementations of GPT and Claude. I haven't really found a use case yet. I don't trust it enough to for queries related to things I don't understand (gaps in my knowledge) and would rather solve these problems or learn these skills through exisiting sources of information that I know have had at least some level of human refinement/vetting. Personally I enjoy the challenge of problem solving in life, particularly when the solution involves learning a new skill that I can utilise again in the future. I find it interesting that AI is advertised as being able to maximise our capabilities as humans, because it appears to be used for the complete opposite in most cases. People want to use their brains less and just be spoonfed the answers.