Where can I see how many AI credits a task used and how many free credits I have left?

1. To see what one run cost, hover over the small info button at the bottom of the AI assistant's reply when it finishes. It shows how long the AI worked and how many credits that run used. Click Run details for more detail.
2. To see your overall usage, open Activity, then Balance activity. You can view line items, group them by service, and drill down by sub-account or by date.
3. To see your balance and any free or included credits, go to Settings, then Billing, and open the Usage tab. The Free usage column shows your AI assistant credits. The full price list for every other usage based service is on the same Usage tab.

As you use the assistant and check these numbers, you get a feel for how many credits different kinds of tasks use.