---
title: "RealtimeServerEventResponseFunctionCallArgumentsDelta"
url: "https://kongair.terwilligar.com/apis/openai-api-2-3-0/versions/ea92d048-c746-4ead-a6a8-da28d93137d1/schemas/RealtimeServerEventResponseFunctionCallArgumentsDelta"
---

> Full API specification: https://kongair.terwilligar.com/apis/openai-api-2-3-0/versions/ea92d048-c746-4ead-a6a8-da28d93137d1.md

# RealtimeServerEventResponseFunctionCallArgumentsDelta

Returned when the model-generated function call arguments are updated.

## OpenAPI definition

```yaml
openapi: 3.0.0
info:
  title: OpenAI API
  version: 2.3.0
servers:
  - url: https://api.openai.com/v1
components:
  schemas:
    RealtimeServerEventResponseFunctionCallArgumentsDelta:
      type: object
      description: |
        Returned when the model-generated function call arguments are updated.
      properties:
        event_id:
          type: string
          description: The unique ID of the server event.
        type:
          type: string
          enum:
            - response.function_call_arguments.delta
          description: |
            The event type, must be `response.function_call_arguments.delta`.
          x-stainless-const: true
        response_id:
          type: string
          description: The ID of the response.
        item_id:
          type: string
          description: The ID of the function call item.
        output_index:
          type: integer
          description: The index of the output item in the response.
        call_id:
          type: string
          description: The ID of the function call.
        delta:
          type: string
          description: The arguments delta as a JSON string.
      required:
        - event_id
        - type
        - response_id
        - item_id
        - output_index
        - call_id
        - delta
      x-oaiMeta:
        name: response.function_call_arguments.delta
        group: realtime
        example: |
          {
              "event_id": "event_5354",
              "type": "response.function_call_arguments.delta",
              "response_id": "resp_002",
              "item_id": "fc_001",
              "output_index": 0,
              "call_id": "call_001",
              "delta": "{\"location\": \"San\""
          }
```