Unfortunately there are some caveats with Opera AI right now, that I have to bring to attention here:
It sometimes happens that no answer is given in the chat for whatever reason. I haven't found a regularity, but it mostly happens in case I add a picture..
I had to realize that old chats that I had deleted from the chat history reappear again, even after deleting them twice or three times.
Whenever I open Opera AI in the sidebar, it shows: read site context toggled on. This gives me the maybe false impression that every site or tab island is already read by Opera AI without giving it permission. I think it should be the other way around: I should make the toggle on manually by my own conscious decision.
I address these three things as to say, that in this way Opera AI isn't really prime time ready.
As long as these issues aren't solved you'd better stay with Aria in my humble opinion or use another browser.