I tried something similar when Llama2 came out, pitting two assistants, who each believed the other is the user, against each other. Ultimately, it was the same model talking with itself. The system prompts for both had various instructions to disagree and criticise the opinion of the user. I provided the first message to get things started. Usually, it’s be along the lines of “nuclear proliferation is harmful to humanity”.

After 15 or so iterations, both assistants would keep repeating the same things and find agreement anyway. Sometimes, the chat became unhinged and useless, but 95/100 times, it was agreement.

Happy someone else made it work.