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openrouter-python-sdk-retry…/docs/components/chatstreamingresponsechunk.md
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# ChatStreamingResponseChunk
Streaming chat completion chunk
## Fields
| Field | Type | Required | Description | Example |
| ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `id` | *str* | :heavy_check_mark: | Unique chunk identifier | chatcmpl-123 |
| `choices` | List[[components.ChatStreamingChoice](../components/chatstreamingchoice.md)] | :heavy_check_mark: | List of streaming chunk choices | |
| `created` | *float* | :heavy_check_mark: | Unix timestamp of creation | 1677652288 |
| `model` | *str* | :heavy_check_mark: | Model used for completion | openai/gpt-4 |
| `object` | [components.ChatStreamingResponseChunkObject](../components/chatstreamingresponsechunkobject.md) | :heavy_check_mark: | N/A | |
| `system_fingerprint` | *Optional[str]* | :heavy_minus_sign: | System fingerprint | fp_44709d6fcb |
| `error` | [Optional[components.Error]](../components/error.md) | :heavy_minus_sign: | Error information | {<br/>"message": "Rate limit exceeded",<br/>"code": 429<br/>} |
| `usage` | [Optional[components.ChatGenerationTokenUsage]](../components/chatgenerationtokenusage.md) | :heavy_minus_sign: | Token usage statistics | {<br/>"completion_tokens": 15,<br/>"prompt_tokens": 10,<br/>"total_tokens": 25,<br/>"completion_tokens_details": {<br/>"reasoning_tokens": 5<br/>},<br/>"prompt_tokens_details": {<br/>"cached_tokens": 2<br/>}<br/>} |