图生图（chat格式）

curl --location --request POST '/v1/chat/completions' \
--header 'Accept: application/json' \
--header 'Authorization: Bearer {{YOUR_API_KEY}}' \
--header 'Content-Type: application/json' \
--data-raw '{
  "max_tokens": 16384,
  "model": "gemini-3-pro-image-preview",
  "temperature": 0.5,
  "top_p": 1,
  "presence_penalty": 0,
  "frequency_penalty": 0,
  "messages": [
    {
      "role": "system",
      "content": "You are Gemini, a large language model trained by Google.\nCurrent model: gemini-3-pro-image-preview\nCurrent time: 2026/2/5 12:43:18\nLatex inline: $x^2$\nLatex block: $$e=mc^2$$"
    },
    {
      "content": "画一只小猫",
      "role": "user"
    },
    {
      "content": "![image](https://crea-img.xinzhiyun.net/upload/draw/20251219/69454591f0be0.jpg) [下载](https://ossdl.ai198.top/91dcbefe11503d7cf77f29b4f9af3535_1770264756463750183.png)",
      "role": "assistant"
    },
    {
      "content": "再画一只小狗 1:1",
      "role": "user"
    }
  ],
  "stream": false
}'