GPT-Image-2 Image Generation

Generate images with gpt-image-2, supporting text-to-image and reference_images based image generation

POST /v1/images/generations

cURL

curl --request POST \
  --url https://toapis.com/v1/images/generations \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
    "model": "gpt-image-2",
    "prompt": "Generate a futuristic city night poster with neon lighting and cinematic composition",
    "n": 1,
    "size": "1:1",
    "resolution": "1K",
    "response_format": "url"
  }'

200

{
  "id": "task_img_abc123def456",
  "object": "generation.task",
  "model": "gpt-image-2",
  "status": "queued",
  "progress": 0,
  "created_at": 1703884800,
  "metadata": {}
}

• Unified image generation API
• Select the gpt-image-2 model via the model parameter
• Supports text-to-image, single-reference, and multi-reference image generation
• Async task management with task ID based result lookup

Important Change: For better performance and cost control, base64 image data is no longer supported in image_urls or reference_images. Please use the Upload Image API first to upload images and obtain a URL.

Authorizations

Authorization · string · required

All endpoints require Bearer Token authentication

Get your API Key from the API Key Management Page

Add to request header:

Authorization: Bearer YOUR_API_KEY

Body

model · string · default: "gpt-image-2" · required

Image generation model name

Example: "gpt-image-2"

prompt · string · required

Text prompt for image generation

Maximum 32,000 characters for GPT image models

size · string · default: "1:1"

Output image aspect ratio

Supported values depend on resolution:

• 1K: 1:1, 3:2, 2:3
• 2K: 1:1, 3:2, 2:3, 4:3, 3:4, 5:4, 4:5, 16:9, 9:16, 2:1, 1:2, 21:9, 9:21
• 4K: 16:9, 9:16, 2:1, 1:2, 21:9, 9:21

resolution · string · default: "1K"

Output resolution tier

Supported values: 1K, 2K, 4K

Size Reference

size	1K	2K	4K
1:1	1024x1024	2048x2048	Not supported
3:2	1536x1024	2048x1360	Not supported
2:3	1024x1536	1360x2048	Not supported
4:3	Not supported	2048x1536	Not supported
3:4	Not supported	1536x2048	Not supported
5:4	Not supported	2560x2048	Not supported
4:5	Not supported	2048x2560	Not supported
16:9	Not supported	2048x1152	3840x2160
9:16	Not supported	1152x2048	2160x3840
2:1	Not supported	2688x1344	3840x1920
1:2	Not supported	1344x2688	1920x3840
21:9	Not supported	2688x1152	3840x1648
9:21	Not supported	1152x2688	1648x3840

n · integer · default: 1

Number of images to generate

Default: 1

response_format · string · default: "url"

Response format

The API returns image URLs, so url is the recommended value

reference_images · string[]

Reference image URLs for image-to-image generation

⚠️ URL format only (base64 no longer supported)

• Publicly accessible URLs (http:// or https://)
• You can use the Upload Image API to upload local files and get URLs
• Supports single-image and multi-image reference

image_urls · string[]

Backward-compatible reference image field

ToAPIs automatically normalizes it to reference_images

Response

id · string

Unique task identifier for status queries

object · string

Object type, always generation.task

model · string

Model name used

status · string

Task status

• queued
• in_progress
• completed
• failed

progress · integer

Task progress percentage (0-100)

created_at · integer

Task creation timestamp (Unix timestamp)

cURL

curl --request POST \
  --url https://toapis.com/v1/images/generations \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
    "model": "gpt-image-2",
    "prompt": "Generate a futuristic city night poster with neon lighting and cinematic composition",
    "n": 1,
    "size": "1:1",
    "resolution": "1K",
    "response_format": "url"
  }'

200

{
  "id": "task_img_abc123def456",
  "object": "generation.task",
  "model": "gpt-image-2",
  "status": "queued",
  "progress": 0,
  "created_at": 1703884800,
  "metadata": {}
}