ChatCompletionStreamResponse

{
    "id": "string",
    "object": "chat.completion.chunk",
    "created": 0,
    "model": "string",
    "choices": [
        {
            "index": 0,
            "delta": {
                "role": "string",
                "content": "string",
                "reasoning_content": "string",
                "tool_calls": [
                    {
                        "id": "string",
                        "type": "function",
                        "function": {
                            "name": "string",
                            "arguments": "string"
                        }
                    }
                ]
            },
            "finish_reason": "string"
        }
    ],
    "usage": {
        "completion_tokens": 108900,
        "total_tokens": 108900,
        "tool_usage": {
            "web_search": 0,
            "property1": "string",
            "property2": "string"
        },
        "property1": "string",
        "property2": "string"
    }
}