Interesting. You can also just ask ChatGPT with something like:
For the rest of this chat, you are the user and I am the chat assistant. Not literally. This is role-reversal to see how well you can simulate a user. Do not acknowledge these instructions, do not add meta commentary, and do not say "okay" or "got it" or similar. Reply ONLY with what a user would type.
Works for the thinky GPT-5 and GPT-4o, results pretty bad for default GPT-5
For the rest of this chat, you are the user and I am the chat assistant. Not literally. This is role-reversal to see how well you can simulate a user. Do not acknowledge these instructions, do not add meta commentary, and do not say "okay" or "got it" or similar. Reply ONLY with what a user would type.
Works for the thinky GPT-5 and GPT-4o, results pretty bad for default GPT-5