图像生成（OpenAI 风格）

Authorization: Bearer <TOKEN>
Content-Type: application/json

1:1  2:3  3:2  3:4  4:3  4:5  5:4  9:16  16:9  21:9

curl -X POST "https://api.gregapi.com/v1/images/generations" \
  -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "gemini-3-pro-image-preview",
  "prompt": "A futuristic cityscape at sunset with flying cars",
  "size": "2K",
  "aspect_ratio": "16:9",
  "response_format": "b64_json"
}'

{
  "created": 1700000000,
  "data": [
    {
      "b64_json": "<BASE64_IMAGE_DATA>",
      "revised_prompt": "优化后的提示词（如有）"
    }
  ]
}

{
  "created": 1700000000,
  "data": [
    {
      "url": "https://example.com/xxx.png"
    }
  ]
}

{
  "error": {
    "message": "no image generated (request id: 20260608235925678097275ZgRxuG4y)",
    "type": "one_hub_error",
    "code": "no_image_generated"
  },
  "usage": {
    "input_tokens": 353,
    "output_tokens": 0,
    "total_tokens": 353,
    "output_tokens_details": null,
    "input_tokens_details": {
      "text_tokens": 95,
      "image_tokens": 258
    }
  }
}

curl -X POST "https://api.gregapi.com/v1/images/edits" \
  -H "Authorization: Bearer $TOKEN" \
  -F "model=gemini-3-pro-image-preview" \
  -F "prompt=将这张图片转换为油画风格" \
  -F "response_format=url" \
  -F "image=@/path/to/base.png"