The line's cost, to 8 decimals.
The MJ: AI Model Costs row that priced the line; null for a line priced from the model configuration.
The input quantity priced on the line, cache reads and writes included.
What the line's quantities count. The default line counts in its cost row's measure ('Tokens', or 'Seconds'
for a time-priced run); the avatar video line counts 'Seconds' at a per-minute price, 'Tokens' at a per-token
price.
null for the default line (the run's cost row); 'Video' for the avatar video line.
The output quantity priced on the line; on the default line, after the video line took its tokens.
One line of a prompt run's cost. The lines add up to the run's
Cost, in itsCostCurrency.