GPT Image 2 Image-to-Image

POST /v1/tasks

All models are called through the Unified Async API POST /v1/tasks endpoint; only the input fields differ (see input parameters below).

Model summary

Model name	gpt-image-2-image-to-image
Type	Image generation (image-to-image)
Endpoint	POST /v1/tasks
Pricing	See HiAPI Pricing

GPT Image 2 Image-to-Image generates new images from references, useful for reference rewriting, product cleanup, and multi-ratio delivery.

Production guidance

For production, pass callback.url at the top level of the request body so HiAPI can notify your service when the task reaches a terminal state.
GET /v1/tasks/:id is better for local debugging, low-volume jobs, or fallback reconciliation if a callback is missed.
Use callback.when=final. Both success and fail are terminal states, so your service should deduplicate by taskId.

Best suited for

Reference rewriting

Use one or more reference images and change style, scene, or commercial polish through the prompt.

input_urlsprompt

Product image cleanup

Turn rough assets into cleaner product photos, poster heroes, or commerce visuals.

promptresolution

Multi-ratio delivery

Keep the reference subject while producing the ratios required by each placement.

aspect_ratio

Detailed constraints

Constrain material, background, lighting, composition, and text requirements in one prompt.

prompt

Request parameters

POST https://api.hiapi.ai/v1/tasks

# Create an async task — returns taskId immediately (generation runs async)
# Replace YOUR_API_KEY with your account API key
curl -X POST "https://api.hiapi.ai/v1/tasks" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "gpt-image-2-image-to-image",
  "input": {
    "prompt": "Turn the reference image into a clean product photo",
    "input_urls": [
      "https://example.com/reference.png"
    ],
    "aspect_ratio": "1:1",
    "resolution": "1K"
  }
}'

import requests, json

# Business params — fields vary by model (see the model page)
payload = json.loads(r'''
{
  "model": "gpt-image-2-image-to-image",
  "input": {
    "prompt": "Turn the reference image into a clean product photo",
    "input_urls": [
      "https://example.com/reference.png"
    ],
    "aspect_ratio": "1:1",
    "resolution": "1K"
  }
}
''')

# Create an async task — returns taskId immediately (generation runs async)
resp = requests.post(
    "https://api.hiapi.ai/v1/tasks",
    headers={"Authorization": "Bearer YOUR_API_KEY", "Content-Type": "application/json"},
    json=payload,
)
print(resp.json())  # Returns { code, message, data: { taskId } }

// Create an async task — returns taskId immediately (generation runs async)
// Replace YOUR_API_KEY with your account API key
const resp = await fetch("https://api.hiapi.ai/v1/tasks", {
  method: "POST",
  headers: {
    "Authorization": "Bearer YOUR_API_KEY",
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
  "model": "gpt-image-2-image-to-image",
  "input": {
    "prompt": "Turn the reference image into a clean product photo",
    "input_urls": [
      "https://example.com/reference.png"
    ],
    "aspect_ratio": "1:1",
    "resolution": "1K"
  }
}),
});
console.log(await resp.json()); // Returns { code, message, data: { taskId } }

model string required

Fixed value gpt-image-2-image-to-image.

example gpt-image-2-image-to-image

input object required

Business parameters for references and generation settings.

prompt string required

Text prompt, up to 20000 characters.

input_urls string[] required

Reference image URL array. At least one image is required.

aspect_ratio enum optional

Generated image aspect ratio.

default auto enum: auto1:13:22:34:33:45:44:516:99:162:11:23:11:321:99:21

resolution enum optional

Image resolution.

default 1K enum: 1K2K4K

callback object optional

Optional callback configuration. In production, pass callback.url so HiAPI can notify your service when the task reaches a terminal state.

url string required

HTTPS URL that receives terminal task notifications.

example https://your-domain.com/hiapi/callback

when enum optional

Callback trigger timing. Use final for terminal-state notifications.

default final enum: final

Example requests

Productize a reference

Restyle a reference image into a clean product visual.

Request body

{
  "model": "gpt-image-2-image-to-image",
  "input": {
    "prompt": "Turn the reference image into a clean commercial product photo on a white acrylic surface",
    "input_urls": [
      "https://example.com/reference.png"
    ],
    "aspect_ratio": "1:1",
    "resolution": "1K"
  }
}

Production request with callback

Create the task, then wait for callback.url to receive the terminal notification.