# ChatCompletionChunkChoiceDelta

Delta changes in streaming response


## Fields

| Field                                                                                                      | Type                                                                                                       | Required                                                                                                   | Description                                                                                                |
| ---------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------- |
| `role`                                                                                                     | [Optional[models.ChatCompletionChunkChoiceDeltaRole]](../models/chatcompletionchunkchoicedeltarole.md)     | :heavy_minus_sign:                                                                                         | The role of the message author                                                                             |
| `content`                                                                                                  | *OptionalNullable[str]*                                                                                    | :heavy_minus_sign:                                                                                         | Message content delta                                                                                      |
| `reasoning`                                                                                                | *OptionalNullable[str]*                                                                                    | :heavy_minus_sign:                                                                                         | Reasoning content delta                                                                                    |
| `refusal`                                                                                                  | *OptionalNullable[str]*                                                                                    | :heavy_minus_sign:                                                                                         | Refusal message delta                                                                                      |
| `tool_calls`                                                                                               | List[[models.ChatCompletionChunkChoiceDeltaToolCall](../models/chatcompletionchunkchoicedeltatoolcall.md)] | :heavy_minus_sign:                                                                                         | Tool calls delta                                                                                           |
| `reasoning_details`                                                                                        | List[[models.ReasoningDetail](../models/reasoningdetail.md)]                                               | :heavy_minus_sign:                                                                                         | Reasoning details delta to send reasoning details back to upstream                                         |
| `annotations`                                                                                              | List[[models.AnnotationDetail](../models/annotationdetail.md)]                                             | :heavy_minus_sign:                                                                                         | Annotations delta to send annotations back to upstream                                                     |