I'm not sure about Gemini, but OpenAI GTP-V bills at roughly a token per 40x40px square. It isn't clear to me these actually processed as units, but rather it s

I'm not sure about Gemini, but OpenAI GTP-V bills at roughly a token per 40x40px square. It isn't clear to me these actually processed as units, but rather it seems like they tried to approximate the cost structure to match text.