Credits are consumed by the blocks that get generated, not by the agents themselves. Some blocks are cheaper than others. A simple prompt or image block is a single model call, while browser use or deliverable blocks like documents and spreadsheets run models in a loop and cost more. Blocks also cost more when they have more blocks connected to them (more input tokens).

In the demo video I shared, the task cost about ~7,000 credits since it ran around 10 BrowserUse blocks and produced multiple deliverables.

If you want to fix a specific block (or set of blocks), you can select them and the chat will scope itself to primarily work on those. In that case fewer blocks run, so it's cheaper.