Same. I was writing my own language compiler with MLIR/C++ and GPT was ok-ish to dive into the space initially but ran out of steam pretty quickly and the recommendations were so off at one point (invented MLIR features, invented libraries, incorrect understanding of the framework, etc) that I had to go back to the drawing board, RTFM, and basically do everything I would have done without GPT to begin with. I've seen similar issues in other problem domains as well just like you. It doesn't surprise me though.