Most AI MVP budgets I see cover the build and forget the monthly line. That line is the model bill, and at a few thousand users it can pass what the build cost. One formula gets you a usable estimate. The formula monthly cost = requests per month x (input tokens x input price + output tokens x output price) Requests per month is users times how often they use the feature. Input tokens include everything you send: system prompt, retrieved context, chat history. Resend...