Iain M Banks Culture series would be the obvious one.
Also Children Of Time which I see another commenter got downvoted into oblivion for. Its optimisitic and it definitely involves AI. Also one of the most lauded sci fi novels of the last decade.
Edit: also Slow Gods by Catherine Webb fits your criteria and is very good
> Culture series
Where the humans are the pets and the (machine) Minds are the real protagonists, in control of everything?
Where the machines have crafted a language that affects the way people think, aligning them better with what the machines wanted?
That's your utopia?
I do hope you don't work for any frontier AI lab!
While I would agree that the Culture series does give a positive view of AI the novels themselves do have quite a lot of rather dark elements...