I spent some time reading the newly released GPT-4o System Card - it's a fascinating document, with all kinds of interesting new-to-me details in there. I've posted my highlights here: https://simonwillison.net/2024/Aug/8/gpt-4o-system-card/
I particularly enjoyed this bit about "scheming"
@simon "...it is unlikely that GPT-4o is capable of catastrophic scheming."
So either it's bad at it or really good at it.