GPT Image 2.5 Sunburst - Text 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 text-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-2-5-sunburst-text-to-image model. Default："gpt-image-2-5-sunburst-text-to-image"。 Allowed values：gpt-image-2-5-sunburst-text-to-image。 Example：gpt-image-2-5-sunburst-text-to-image。
prompt	string	Yes	Prompt required by the ModelFold gateway; at most 2000 characters. Text prompt. Required, maximum 20,000 characters. minLength: 1. maxLength: 2000. Example：A cinematic night city poster with neon reflections on a rainy street.。
aspect_ratio	string	No	The aspect ratio of the generated image is set to auto by default. The 27:16, 16:27, 9:8 and 8:9 aspect ratios support 1K only. 2K and 4K are available for other aspect ratios. Allowed values：auto / 1:1 / 3:2 / 2:3 / 4:3 / 3:4 / 16:9 / 9:16 / 21:9 / 27:16 / 16:27 / 9:8 / 8:9。 Example：auto。
resolution	string	No	Image resolution. 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-2-5-sunburst-text-to-image",
  "prompt": "A cinematic night city poster with neon reflections on a rainy street."
}'

{
  "model": "gpt-image-2-5-sunburst-text-to-image",
  "prompt": "A cinematic night city poster with neon reflections on a rainy street."
}

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": {}
}