I second the utility of the Kagi Assistant. I didn't think I would use it much but now do so constantly. Especially because ending a regular search query in a question mark will cause the results page to lead with the Assistant answer! It's a delightful way to try both search and LLMs in one UI interaction.
Isn't that what all of the search engines do now by default?
They do it by default, Kagi lets the user control if and when they want LLM results.