Introduced on day 50
Cost per supported answer
Total spend divided by the number of answers that were correct and supported by the evidence, which includes the cost of requests that did not produce one.
In detail
Price per request understates the unit cost of useful output because failed and abstained requests are paid for as well. Cost per supported answer falls when recall rises, when retries and padded contexts fall, and when routing sends easy requests to cheaper models. Prices used in a review should be labelled as assumptions.