{
    "model": "deepseek-ai/deepseek-vl2",
    "messages": [
        {
            "role": "system",
            "content": "You are an image recognition tool, please output a JSON string and nothing else. You need to include the field desc `desc`, which indicates the content of the image."
        },
        {
            "role": "user",
            "content": [
              {"type": "image_url", "image_url": {"url": "data:image/png;base64,xxxxx"}},
              {"type": "text", "text": "what's this"}
            ]
        }
    ],
    "response_format": {
        "type": "json_object"
    }
}