Hi @matvei ,
Each model has a maximum number of tokens that it can handle in a prompt and response. Knowing the token count of your prompt lets you know whether you’ve exceeded this limit or not. The token calculations outlined in the first link is useful when calculating or estimating the size of your total prompt, but it is not the cost of the prompt.
Your second link is the pricing of images in the prompt. As an example your billing report would have a line item that would include:
Gemini 1.5 Pro Image Input - Predictions (the SKU), XX images input, total $$ cost for images.