I've noticed 4o uses a lot of emojis, and, in general, is very enthusiastic. I find it funny. If I want a more formal bot, I switch to one of the o3 family.
The other day I asked a fairly innocuous question and it LOLed and said it’d give me the ‘no Bullshit answer’
edit: does hacker news filter out emojis? TIL (there should be emojis after this colon: )