Depends on the model. I’ve found Gemini to have the most silver tongue and Anthropic models to be the most harsh critics to the point of hilarity.

I’ve been burning spare weekly quota on fringe-adjacent physics. I often copy-paste the LaTeX format “paper” back and forth for “peer review of a friend’s work”.

Gemini: “Your friend’s insight hits the nail right on the head!”

Opus: “Tell your friend to stop wasting his time now, it’s more kind than to keep indulging him.”

Brutal.