GPT Image 2 - Image To Image

Endpoint

POST /images/generations

Full URL: https://modelfold.ai/v1/images/generations

Authentication: every request must include the Authorization: Bearer <API_KEY> header.

Send model parameters directly in the JSON body. Do not wrap them in input. This request waits for generation to finish and returns data[].url; supported media models also offer async jobs, polling and callbacks. Replace example media URLs with your own publicly accessible files. See API gateway for billing and errors.

Input parameters for the image-to-image task.

Request Parameters

Body (application/json)

Parameter	Type	Required	Description
model	string	Yes	The model name used for generation. This field is required. This endpoint must use the gpt-image-2-image-to-image model. Default："gpt-image-2-image-to-image"。 Allowed values：gpt-image-2-image-to-image。 Example：gpt-image-2-image-to-image。
prompt	string	Yes	Prompt required by the ModelFold gateway; at most 2000 characters. Text prompts, up to 20,000 characters. maxLength: 2000. Example：Transform this product image into a premium e-commerce poster style.。
input_urls	array<string>	No	Array of input image URLs. maxItems: 16.
aspect_ratio	string	No	The aspect ratio of the generated image is set to auto by default. Note: for 2K resolution, the following aspect ratios are not supported: 5:4, 4:5, 3:1, 1:3, and 9:21. for 4K resolution, the following aspect ratios are not supported: 3:1, 1:3, and 9:21. Allowed values：auto / 1:1 / 3:2 / 2:3 / 4:3 / 3:4 / 5:4 / 4:5 / 16:9 / 9:16 / 2:1 / 1:2 / 3:1 / 1:3 / 21:9 / 9:21。 Example：auto。
resolution	string	No	Output resolution: 1K, 2K or 4K. Set this field explicitly. 2K does not support 5:4, 4:5, 3:1, 1:3 or 9:21; 4K does not support 3:1, 1:3 or 9:21. The background parameter is only available at 1K. Allowed values：1K / 2K / 4K。 Example：1K。
background	string	No	Image background Note: This parameter is only supported when the resolution is 1K. Allowed values：transparent / opaque / auto。 Example：transparent。

Request Example

curl -X POST "https://modelfold.ai/v1/images/generations" \
  -H "Authorization: Bearer $MODELFOLD_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "gpt-image-2-image-to-image",
  "prompt": "Transform this product image into a premium e-commerce poster style."
}'

{
  "model": "gpt-image-2-image-to-image",
  "prompt": "Transform this product image into a premium e-commerce poster style."
}

Response

200 — Generation completed. usage contains actual billing details; result URLs are illustrative.

{
  "ok": true,
  "created": 1792134000,
  "data": [
    {
      "url": "https://modelfold.ai/uploads/outputs/result.png"
    }
  ],
  "usage": {}
}