> ## 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.

# ChatStreamChoice - Python SDK

> ChatStreamChoice method reference

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

Streaming completion choice chunk

## Fields

| Field           | Type                                                                                       | Required             | Description                          | Example                                                                                                                       |
| --------------- | ------------------------------------------------------------------------------------------ | -------------------- | ------------------------------------ | ----------------------------------------------------------------------------------------------------------------------------- |
| `delta`         | [components.ChatStreamDelta](/client-sdks/python/api-reference/components/chatstreamdelta) | :heavy\_check\_mark: | Delta changes in streaming response  | `{"content": "Hello","role": "assistant"}`                                                                                    |
| `finish_reason` | [Nullable\[components.ChatFinishReasonEnum\]](../components/chatfinishreasonenum.md)       | :heavy\_check\_mark: | N/A                                  | stop                                                                                                                          |
| `index`         | *int*                                                                                      | :heavy\_check\_mark: | Choice index                         | 0                                                                                                                             |
| `logprobs`      | [OptionalNullable\[components.ChatTokenLogprobs\]](../components/chattokenlogprobs.md)     | :heavy\_minus\_sign: | Log probabilities for the completion | `{"content": [{"bytes": null,"logprob": -0.612345,"token": " Hello","top_logprobs": []}`<br />],<br />"refusal": `null<br/>`} |