Best AI I have used for support was Githubs, and even then Github has some nuance between its different enterprise offerings that it didnt quite grasp.

I find that 99%+ of support LLMs are just an extra hurdle that cant provide me with what I want.

I used Kogans chat LLM the other day, I gave it the details of my enquiry and it escalated me to a human. The human reviewed the case and then raised a ticket for a technical contact. I am not particularly angry at the LLM or the first human, but one of them is definitely redundant and wasting my time.