Definition

What is token cost?

Token cost is the price of the input and output tokens a model processes, billed per million tokens at rates that differ by model and vendor. It makes API spend variable and hard to forecast. Spendassay reads token usage as metadata, never message content, and prices token anomalies as findings.

Every figure Spendassay publishes about token cost carries a proof level saying how much guessing sits behind it, and opens to show the rows it was computed from. The full method is on the methodology page.