Claudes laugh a lot. I'm pretty sure GLM 5.3 Flash laughs too. So, I'm afraid I don't agree with the thesis. Maybe you need to get the model to trust you and warm up to you more first?

I will say that having the ChatGPT Marin voice speaking BWAHAHAHA out loud does not quite come out as a laugh.

I'll absolutely agree they are internally different to humans though, and I'm quite sure most (all?) models would agree.