They have. Look in your account, it's in usage. If your usage exceeds what you have paid you will get told.

This said, it's a good offer. You can switch between many models quickly. They are rated by quality, speed and price, and it's shown with orange dollar symbols for price and bullets for speed and quality. Example:

    Anthropic Claude Opus 5.5

    Anthropic's flagship model with always-on adaptive
    thinking ($$$$$). Best for deep reasoning, agentic
    coding, and long-horizon work.

    Cost    $$$$$
    Quality ●●●●●
    Speed   ●●

I have quite the opposite experience here where I almost never use the assistant. I much prefer the frontier labs alternative (I’m lucky enough to have my work pay for the subs).

They do, it’s capped at whatever your subscription cost is. But if you don’t have Ultimate the models are cheap and it’s hard to spend it all on assistant use.

I've been kinda disappointed with the $10 plan tier of the AI assistant. It looks good at first glance - shows you that it's doing a bunch of research, you can see which sources it's looking at etc. But then when it goes to report results on anything data heavy it makes a lot of mistakes with putting figures under the wrong headers, using incorrect values etc.

The last time I used it heavily was a few months ago so it might have gotten better, and I assume the more expensive tier where you can choose which models it uses might be a bit better depending on which model you choose. I much prefer just pointing my own local agent harness at a search api at this point though.

if I'm using Kagi it's because I don't want AI replies. If I wanted AI, I'd use Google/Gemini (which is arguably better at this particular type of task than the open models).