Just about every help desk company is working on some kind of GPT integration that's both customer-facing and agent-facing. Intercom comes to mind:

https://www.intercom.com/ai-bot

https://twitter.com/destraynor/status/1635705915595685902

Sort of. I use GPT-4 through Cody.ai to handle queries against a large knowledge base on my site Gnow.ly