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openrouter-python-sdk-retry…/docs/components/chatstreamdelta.mdx

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---
title: "ChatStreamDelta"
---
Delta changes in streaming response
## Fields
| Field | Type | Required | Description | Example |
| ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| `audio` | [Optional[components.ChatAudioOutput]](../components/chataudiooutput.mdx) | :heavy_minus_sign: | N/A | \{<br/>"data": "UklGRnoGAABXQVZFZm10IBAAAAABAAEAQB8AAEAfAAABAAgAZGF0YQoGAACBhYqFbF1f",<br/>"expires_at": 1677652400,<br/>"id": "audio_abc123",<br/>"transcript": "Hello! How can I help you today?"<br/>} |
| `content` | *OptionalNullable[str]* | :heavy_minus_sign: | Message content delta | Hello |
| `reasoning` | *OptionalNullable[str]* | :heavy_minus_sign: | Reasoning content delta | I need to |
| `reasoning_details` | List[[components.ReasoningDetailUnion](../components/reasoningdetailunion.mdx)] | :heavy_minus_sign: | Reasoning details for extended thinking models | [<br/>\{<br/>"text": "Let me think about this...",<br/>"type": "text"<br/>}<br/>] |
| `refusal` | *OptionalNullable[str]* | :heavy_minus_sign: | Refusal message delta | null |
| `role` | [Optional[components.ChatStreamDeltaRole]](../components/chatstreamdeltarole.mdx) | :heavy_minus_sign: | The role of the message author | assistant |
| `tool_calls` | List[[components.ChatStreamToolCall](../components/chatstreamtoolcall.mdx)] | :heavy_minus_sign: | Tool calls delta | |