# OpenResponsesUsage Token usage information for the response ## Fields | Field | Type | Required | Description | | ------------------------------------------------------------------- | ------------------------------------------------------------------- | ------------------------------------------------------------------- | ------------------------------------------------------------------- | | `input_tokens` | *float* | :heavy_check_mark: | N/A | | `input_tokens_details` | [models.InputTokensDetails](../models/inputtokensdetails.md) | :heavy_check_mark: | N/A | | `output_tokens` | *float* | :heavy_check_mark: | N/A | | `output_tokens_details` | [models.OutputTokensDetails](../models/outputtokensdetails.md) | :heavy_check_mark: | N/A | | `total_tokens` | *float* | :heavy_check_mark: | N/A | | `cost` | *OptionalNullable[float]* | :heavy_minus_sign: | Cost of the completion | | `is_byok` | *Optional[bool]* | :heavy_minus_sign: | Whether a request was made using a Bring Your Own Key configuration | | `cost_details` | [Optional[models.CostDetails]](../models/costdetails.md) | :heavy_minus_sign: | N/A |