> ## Documentation Index
> Fetch the complete documentation index at: https://openrouter-d02e98a0-mintlify-5b6e02fd.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# CostDetails - Python SDK

> CostDetails method reference

<Warning>
  The Python SDK and docs are currently in beta.
  Report issues on [GitHub](https://github.com/OpenRouterTeam/python-sdk/issues).
</Warning>

## Fields

| Field                            | Type                       | Required             | Description |
| -------------------------------- | -------------------------- | -------------------- | ----------- |
| `upstream_inference_cost`        | *OptionalNullable\[float]* | :heavy\_minus\_sign: | N/A         |
| `upstream_inference_input_cost`  | *float*                    | :heavy\_check\_mark: | N/A         |
| `upstream_inference_output_cost` | *float*                    | :heavy\_check\_mark: | N/A         |