Grok has similar levels of sycophancy to the others imho. I have several times followed it down rabbit holes of agreeableness. It does have an argumentative mode, but that just turns it into an asshole without any additional thoughfulness.

Yeah this makes sense (presuming you're talking about private chat). Most of what I've seen from Grok is its comments in a public forum, which are less targetted toward a single individual & therefore, I presume, less likely to be agreeable given the perspectives being expressed are diverse.

Sounds familiar.