GPT Image-1.5 - 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 generation task

Request Parameters

Body (application/json)

Parameter	Type	Required	Description
model	string	Yes	The model name to use for generation. Required field. - Must be gpt-image/1.5-image-to-image for this endpoint Default："gpt-image/1.5-image-to-image"。 Allowed values：gpt-image/1.5-image-to-image。 Example：gpt-image/1.5-image-to-image。
input_urls	array<string>	Yes	Upload an image file to use as input for the API (File URL after upload, not file content; Accepted types: image/jpeg, image/png, image/webp; Max size: 10.0MB) maxItems: 16.
prompt	string	Yes	Prompt required by the ModelFold gateway; at most 2000 characters. A text description of the image you want to generate maxLength: 2000. Example：Edit the image to dress the woman using the provided clothing images. Preserve her exact likeness, expression, hairstyle, and proportions. Replace only the clothing, fitting the garments naturally to her existing pose and body geometry with realistic fabric behavior. Match lighting, shadows, and color temperature to the original photo so the outfit integrates photorealistically, without looking pasted on.。
aspect_ratio	string	Yes	Required. Width-height ratio of the image, determining its visual form. Allowed values：1:1 / 2:3 / 3:2。 Example：3:2。
quality	string	Yes	Required. Quality: medium=balanced, high=slow/detailed. Allowed values：medium / high。 Example：medium。

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/1.5-image-to-image",
  "input_urls": [
    "https://example.com/reference.png"
  ],
  "prompt": "Edit the image to dress the woman using the provided clothing images. Preserve her exact likeness, expression, hairstyle, and proportions. Replace only the clothing, fitting the garments naturally to her existing pose and body geometry with realistic fabric behavior. Match lighting, shadows, and color temperature to the original photo so the outfit integrates photorealistically, without looking pasted on.",
  "aspect_ratio": "3:2",
  "quality": "medium"
}'

{
  "model": "gpt-image/1.5-image-to-image",
  "input_urls": [
    "https://example.com/reference.png"
  ],
  "prompt": "Edit the image to dress the woman using the provided clothing images. Preserve her exact likeness, expression, hairstyle, and proportions. Replace only the clothing, fitting the garments naturally to her existing pose and body geometry with realistic fabric behavior. Match lighting, shadows, and color temperature to the original photo so the outfit integrates photorealistically, without looking pasted on.",
  "aspect_ratio": "3:2",
  "quality": "medium"
}

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": {}
}