I'm confused why GPT-4 (chat) is so bad at not rhyming in poems. Not only does telling it not to rhyme not stick, but when I try to have it show its work it makes up bizarre justifications. Fascinating!
The only way I was able to get a poem whose lines didn't match was to ask for a list of words that didn't rhyme first, and then ask for a poem where each word was the end of a line in the poem.
Notably, this worked for GPT-4 chat but not GPT-3.5 chat