The API fee is the most visible part of an AI system.
The per-token fee is the number on the pricing page — the easiest cost to see, and almost never the largest line on the real invoice. This pillar opens the whole bill: what a token actually costs once you count the reasoning tokens you never see, why renting through an API or buying your own GPUs is the decision that moves the total most, and the hidden line items that turn a cheap demo into an expensive system. Budget for the whole system, not the call. (Prices are stamped with the month — a deliberate time capsule.)
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