The feature is in Alpha. They use the Ultimate tier as an early testing group. One thing you’re paying for at that tier is access to stuff like this fresh out of the lab.
Can you share a link to the page that says so (not correctly).
> Kagi Sidekick is a helpful and cheerful assistant that assists users in finding the information they want on the Kagi website. It is a product feature backed by Kagi Search and large language models. Kagi Sidekick is currently in open beta and is only available to Ultimate plan members. <link to Kagi Assistant page>
The page it linked to was this[2], which stated similarly to the latter line above, except 'Sidekick' swapped to 'Assistant'. I had assumed from this that Sidekick had been renamed sometime recently or something.
> Kagi Assistant is currently in open beta only available to Ultimate plan members.