GPT Image 2

Overview

GPT Image 2 is an OpenAI image model for text-to-image generation and reference-guided image editing. Use this page when you are ready to call the API after trying the model in the APIXO playground.

Capability	Value
Model ID	`gpt-image-2`
Modes	`text-to-image`, `image-to-image`
Prompt length	1-20000 characters
Reference images	1-16 URLs for `image-to-image`
Aspect ratios	`auto`, `1:1`, `1:2`, `2:1`, `2:3`, `3:2`, `4:3`, `3:4`, `4:5`, `5:4`, `16:9`, `9:16`, `21:9`
Size formats	Supported ratio values or custom `WIDTHxHEIGHT`
Resolution tiers	`1k`, `2k`, `4k`
Quality levels	`low`, `medium`, `high`

Endpoint and authentication

Base URL:

https://api.apixo.ai/api/v1

Method	Endpoint	Purpose
`POST`	`/generateTask/gpt-image-2`	Submit a generation task
`GET`	`/statusTask/gpt-image-2?taskId={taskId}`	Poll task status and retrieve results

All requests require your APIXO API key:

Authorization: Bearer YOUR_API_KEY

Submit requests also require:

Content-Type: application/json

Copy-paste async quickstart

This minimal request submits a text-to-image task and returns a taskId.

curl -X POST "https://api.apixo.ai/api/v1/generateTask/gpt-image-2" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "request_type": "async",
    "input": {
      "mode": "text-to-image",
      "prompt": "a futuristic city skyline at dusk",
      "size": "21:9",
      "resolution": "2k",
      "quality": "high"
    }
  }'

Successful response:

{
  "code": 200,
  "message": "success",
  "data": {
    "taskId": "task_12345678"
  }
}

Save the taskId; you need it to poll for the final result.

Poll for result

curl -X GET "https://api.apixo.ai/api/v1/statusTask/gpt-image-2?taskId=task_12345678" \
  -H "Authorization: Bearer YOUR_API_KEY"

Processing response:

{
  "code": 200,
  "message": "success",
  "data": {
    "taskId": "task_12345678",
    "state": "processing",
    "createTime": 1767965610929
  }
}

Success response:

{
  "code": 200,
  "message": "success",
  "data": {
    "taskId": "task_12345678",
    "state": "success",
    "resultJson": "{\"resultUrls\":[\"https://file.apixo.ai/xxx.png\"]}",
    "createTime": 1767965610929,
    "completeTime": 1767965652317,
    "costTime": 41388
  }
}

Failed response:

{
  "code": 200,
  "message": "success",
  "data": {
    "taskId": "task_12345678",
    "state": "failed",
    "failCode": "CONTENT_VIOLATION",
    "failMsg": "Content does not meet safety guidelines",
    "createTime": 1767965610929,
    "completeTime": 1767965620132
  }
}

Parse resultJson after state becomes success:

const payload = JSON.parse(data.resultJson);
const imageUrls = payload.resultUrls;

Request body

Text-to-image

{
  "request_type": "async",
    "input": {
      "mode": "text-to-image",
      "prompt": "a fox in watercolor style",
      "aspect_ratio": "16:9",
      "size": "16:9",
      "resolution": "2k",
      "quality": "high"
    }
  }

Image-to-image

{
  "request_type": "async",
    "input": {
      "mode": "image-to-image",
      "prompt": "turn this photo into an oil painting",
      "image_urls": [
        "https://example.com/source.png"
      ],
      "size": "3840x2160",
      "resolution": "4k"
    }
  }

Parameters

string

default:"async"

required

Result delivery mode. Use async for polling with statusTask, or callback for webhook delivery.

string

Required when request_type is callback. Must be a public HTTPS URL that can receive the final task payload. See Webhooks.

object

required

GPT Image 2 input parameters.

Show properties

string

required

Generation mode. Supported values: text-to-image, image-to-image.

string

required

Text prompt describing the desired image or edit. Supports 1-20000 characters.

string[]

Reference image URLs. Required for image-to-image. Supports 1-16 URLs.

string

default:"auto"

Output aspect ratio. Supported values: auto, 1:1, 1:2, 2:1, 2:3, 3:2, 4:3, 3:4, 4:5, 5:4, 16:9, 9:16, 21:9.

string

Optional output size. Supports the same ratio values as aspect_ratio, or custom WIDTHxHEIGHT such as 2304x1536.

string

default:"1k"

Output resolution tier. Supported values: 1k, 2k, 4k. When 4k is requested, only 16:9, 9:16, 21:9, 1:2, 2:1, or custom WIDTHxHEIGHT with one edge equal to 3840 will keep 4k; other supported ratios or custom sizes will be processed as 2k.

string

Optional quality level. Supported values: low, medium, high.

Response format

Submit task response

POST /generateTask/gpt-image-2 returns a task ID when the task is accepted:

integer

API status code. 200 means the task was accepted.

string

Human-readable status message.

string

Unique task identifier used with the status endpoint.

Status response fields

string

Unique task identifier.

string

Current task state: pending, processing, success, or failed.

string

JSON string containing the generated image URLs. Present when state is success.

string

Machine-readable failure code. Present when state is failed.

string

Human-readable failure message. Present when state is failed.

integer

Task creation timestamp in Unix milliseconds.

integer

Task completion timestamp in Unix milliseconds. Present after completion.

integer

Processing duration in milliseconds. Present after successful completion.

Webhook callback mode

Use callback mode when your backend should receive the final result automatically instead of polling.

curl -X POST "https://api.apixo.ai/api/v1/generateTask/gpt-image-2" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "request_type": "callback",
    "callback_url": "https://your-server.com/webhooks/apixo",
    "input": {
      "mode": "text-to-image",
      "prompt": "a clean product photo of wireless earbuds on soft stone",
      "aspect_ratio": "1:1",
      "resolution": "2k",
      "quality": "medium"
    }
  }'

See Webhooks for delivery requirements and retry behavior.

Billing

GPT Image 2 is billed per generated image. The selected quality and billed resolution determine the unit price.

Params	APIXO price
`quality=low, resolution=1k`	`0.0300`
`quality=low, resolution=2k`	`0.0400`
`quality=low, resolution=4k`	`0.0550`
`quality=medium, resolution=1k`	`0.0424`
`quality=medium, resolution=2k`	`0.0448`
`quality=medium, resolution=4k`	`0.0808`
`quality=high, resolution=1k`	`0.1688`
`quality=high, resolution=2k`	`0.1776`
`quality=high, resolution=4k`	`0.3208`

For current route and market comparison pricing, see Pricing.

Latency and polling

Actual latency may vary by prompt complexity, provider route, and current queue load.

Resolution	Typical generation time	Recommended first poll	Poll interval
`1k`	30s-120s	30s after task creation	10s
`2k`	60s-180s	60s after task creation	10s
`4k`	120s-240s	120s after task creation	10s

For high-concurrency production workloads, use callback mode to avoid frequent polling.

Size rules

size can be either a supported ratio value or a custom WIDTHxHEIGHT.
Supported ratio values are the same as aspect_ratio: auto, 1:1, 1:2, 2:1, 2:3, 3:2, 4:3, 3:4, 4:5, 5:4, 16:9, 9:16, 21:9.
When both size and aspect_ratio are provided, size takes precedence.
1:2 and 2:1 are supported.
When resolution=4k, only 16:9, 9:16, 21:9, 1:2, 2:1, or custom WIDTHxHEIGHT with one edge equal to 3840 will keep 4k.
When resolution=4k is used with other supported ratios, or with custom WIDTHxHEIGHT whose two edges are both not 3840, the task will be processed as 2k.
Custom WIDTHxHEIGHT requires both dimensions to be divisible by 16.
Custom WIDTHxHEIGHT cannot exceed 3840 pixels on either edge.
Custom WIDTHxHEIGHT total pixels must stay between 655360 and 8294400.
Custom WIDTHxHEIGHT aspect ratio cannot exceed 3:1.
Custom WIDTHxHEIGHT requires resolution to be 2k or 4k.

Rate limits and concurrency can vary by account, API key, and route. If you receive 429, slow down requests and retry with backoff. For account-level details, see System APIs.

Errors and troubleshooting

HTTP errors

Code	Meaning	What to do
`400`	Invalid request body, mode, parameter, or image URL shape	Fix the request before retrying
`401`	Missing or invalid API key	Check the `Authorization` header
`402`	Insufficient balance or quota	Add balance or switch account/key
`403`	Key or route cannot access the model	Check permissions and route strategy
`429`	Rate limit or concurrency limit reached	Retry with exponential backoff
`500`	Server error	Retry with backoff
`502`	Upstream provider error	Retry with backoff
`504`	Upstream timeout	Retry or use callback mode for long-running jobs

Task failure codes

Fail code	Meaning	What to do
`CONTENT_VIOLATION`	Prompt or reference image failed safety checks	Change the prompt or input image
`INVALID_IMAGE_URL`	A reference image URL could not be fetched or decoded	Use a public, direct image URL
`INVALID_PARAMETER`	A model parameter is unsupported or malformed	Check `mode`, `aspect_ratio`, `resolution`, and `image_urls`
`INSUFFICIENT_BALANCE`	The account does not have enough balance for the task	Add balance before retrying
`UPSTREAM_ERROR`	Provider-side failure	Retry with backoff or try another route
`TIMEOUT`	Generation did not finish in time	Retry, reduce input complexity, or use callback mode

See Error Codes for the full error reference.

Getting Started

Image Models

Video Models

Audio Models

Text & Utility Models

Overview

Endpoint and authentication

Copy-paste async quickstart

Poll for result

Request body

Text-to-image

Image-to-image

Parameters

Response format

Submit task response

Status response fields

Webhook callback mode

Billing

Latency and polling

Size rules

Errors and troubleshooting

HTTP errors

Task failure codes

​Overview

​Endpoint and authentication

​Copy-paste async quickstart

​Poll for result

​Request body

​Text-to-image

​Image-to-image

​Parameters

​Response format

​Submit task response

​Status response fields

​Webhook callback mode

​Billing

​Latency and polling

​Size rules

​Errors and troubleshooting

​HTTP errors

​Task failure codes

​Related links

Overview

Endpoint and authentication

Copy-paste async quickstart

Poll for result

Request body

Text-to-image

Image-to-image

Parameters

Response format

Submit task response

Status response fields

Webhook callback mode

Billing

Latency and polling

Size rules

Errors and troubleshooting

HTTP errors

Task failure codes

Related links