Claude Opus. GPT-4 gives sensible answers to basic questions, but takes serious persuading to produce useful output on non-trivial work. Opus can be used as an

Claude Opus. GPT-4 gives sensible answers to basic questions, but takes serious persuading to produce useful output on non-trivial work. Opus can be used as an integral part of an engineering workflow and only takes 2-3 tries to get from ill-formed query to working product. This works particularly well when you copy the relevant excerpt from a project, dump it in, and say "Change X to Y, showing only the key modifications and where to put them". Typically it understands the aim and accomplishes the task in the way you intended, and it knows how to be concise yet precise.