GPT-4 is generally excellent. If you have errors, you can often ask it to fix them. GPT-3.5 is not so good. I recently asked GPT-4 to write an elisp function t

GPT-4 is generally excellent. If you have errors, you can often ask it to fix them. GPT-3.5 is not so good. I recently asked GPT-4 to write an elisp function that would automatically query GPT using an openai client and insert a docstring written by GPT for any Python function under the point. It worked on the first try!