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openrouter-python-sdk-retry…/docs/models/chatcompletionchunk.md
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# ChatCompletionChunk
Streaming chat completion chunk
## Fields
| Field | Type | Required | Description |
| -------------------------------------------------------------------------------- | -------------------------------------------------------------------------------- | -------------------------------------------------------------------------------- | -------------------------------------------------------------------------------- |
| `id` | *str* | :heavy_check_mark: | N/A |
| `choices` | List[[models.ChatCompletionChunkChoice](../models/chatcompletionchunkchoice.md)] | :heavy_check_mark: | N/A |
| `created` | *float* | :heavy_check_mark: | N/A |
| `model` | *str* | :heavy_check_mark: | N/A |
| `object` | [models.ChatCompletionChunkObject](../models/chatcompletionchunkobject.md) | :heavy_check_mark: | N/A |
| `system_fingerprint` | *OptionalNullable[str]* | :heavy_minus_sign: | N/A |
| `usage` | [Optional[models.CompletionUsage]](../models/completionusage.md) | :heavy_minus_sign: | Token usage statistics |