LongCat Image API - AI Image Generation APIs

LongCat Image API, developers can generate detailed images for various applications including illustrations, concept art, and marketing visuals. The API offers reliable performance and supports standard image generation workflows with customizable parameters.

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LongCat v1 Text to Image API Documentation

https://gateway.pixazo.ai/longcat-image-498/v1

Authentication

All requests require an API key passed via header.

Header	Type	Required	Description
Ocp-Apim-Subscription-Key	string	Yes	Your API subscription key

LongCat-Image generate request - LongCat-Image

Request Code

POST https://gateway.pixazo.ai/longcat-image-498/v1/longcat-image-request
Content-Type: application/json
Cache-Control: no-cache
Ocp-Apim-Subscription-Key: YOUR_SUBSCRIPTION_KEY

{
  "prompt": "A lioness crouching in the tall dry grass of the Serengeti during golden hour, intense gaze, telephoto lens with shallow depth of field",
  "image_size": "landscape_4_3",
  "num_inference_steps": 28,
  "guidance_scale": 4.5,
  "num_images": 1,
  "enable_safety_checker": true,
  "output_format": "png",
  "acceleration": "regular"
}

import requests

url = "https://gateway.pixazo.ai/longcat-image-498/v1/longcat-image-request"
headers = {
    "Content-Type": "application/json",
    "Cache-Control": "no-cache",
    "Ocp-Apim-Subscription-Key": "YOUR_SUBSCRIPTION_KEY"
}
data = {
    "prompt": "A lioness crouching in the tall dry grass of the Serengeti during golden hour, intense gaze, telephoto lens with shallow depth of field",
    "image_size": "landscape_4_3",
    "num_inference_steps": 28,
    "guidance_scale": 4.5,
    "num_images": 1,
    "enable_safety_checker": true,
    "output_format": "png",
    "acceleration": "regular"
}

response = requests.post(url, headers=headers, json=data)
print(response.json())

const url = 'https://gateway.pixazo.ai/longcat-image-498/v1/longcat-image-request';

const data = {
  prompt: 'A lioness crouching in the tall dry grass of the Serengeti during golden hour, intense gaze, telephoto lens with shallow depth of field',
  image_size: 'landscape_4_3',
  num_inference_steps: 28,
  guidance_scale: 4.5,
  num_images: 1,
  enable_safety_checker: true,
  output_format: 'png',
  acceleration: 'regular'
};

fetch(url, {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'Cache-Control': 'no-cache',
    'Ocp-Apim-Subscription-Key': 'YOUR_SUBSCRIPTION_KEY'
  },
  body: JSON.stringify(data)
})
.then(response => response.json())
.then(data => console.log(data))
.catch(error => console.error('Error:', error));

curl -X POST "https://gateway.pixazo.ai/longcat-image-498/v1/longcat-image-request" \
  -H "Content-Type: application/json" \
  -H "Cache-Control: no-cache" \
  -H "Ocp-Apim-Subscription-Key: YOUR_SUBSCRIPTION_KEY" \
  --data-raw '{
    "prompt": "A lioness crouching in the tall dry grass of the Serengeti during golden hour, intense gaze, telephoto lens with shallow depth of field",
    "image_size": "landscape_4_3",
    "num_inference_steps": 28,
    "guidance_scale": 4.5,
    "num_images": 1,
    "enable_safety_checker": true,
    "output_format": "png",
    "acceleration": "regular"
  }'

Output

{
  "request_id": "longcat-image-498_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "QUEUED",
  "polling_url": "https://gateway.pixazo.ai/v2/requests/status/longcat-image-498_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
}

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Webhook (Optional)

Add the X-Webhook-URL header to your generate request to receive a POST callback instead of polling.

X-Webhook-URL: https://your-server.com/webhook/callback

Request Parameters - LongCat-Image generate request

Parameter	Required	Type	Description
prompt	Yes	string	Detailed textual description of the desired image content. Be specific for best results.
image_size	Yes	string	Aspect ratio and resolution preset. Supported values: `landscape_4_3`, `portrait_3_4`, `square_1_1`, `ultra_wide_16_9`, `ultra_portrait_9_16`.
num_inference_steps	No	integer	Number of denoising steps during image generation. Higher values increase quality but slow generation.
guidance_scale	No	number	Controls how closely the generated image follows the prompt. Higher values increase prompt fidelity but may reduce diversity.
num_images	No	integer	Number of images to generate per request.
enable_safety_checker	No	boolean	Enables content safety filtering to block inappropriate outputs.
output_format	No	string	File format of generated images. Supported values: `png`, `jpeg`, `webp`.
acceleration	No	string	Rendering optimization mode. Values: `regular`, `high_performance`. Use `high_performance` for faster generation with potential quality trade-offs.

Example Request

{
  "prompt": "A lioness crouching in the tall dry grass of the Serengeti during golden hour, intense gaze, telephoto lens with shallow depth of field",
  "image_size": "landscape_4_3",
  "num_inference_steps": 28,
  "guidance_scale": 4.5,
  "num_images": 1,
  "enable_safety_checker": true,
  "output_format": "png",
  "acceleration": "regular"
}

Response

{
  "request_id": "longcat-image-498_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "QUEUED",
  "polling_url": "https://gateway.pixazo.ai/v2/requests/status/longcat-image-498_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
}

Request Headers

Header	Value
Content-Type	application/json
Cache-Control	no-cache
Ocp-Apim-Subscription-Key	YOUR_SUBSCRIPTION_KEY

Response Handling

Common status codes.

Code	Meaning
202	Accepted — Request queued
400	Bad Request
401	Unauthorized
402	Insufficient Balance
403	Forbidden
429	Too Many Requests
500	Internal Server Error

Error Responses

Queue system errors and model validation errors.

Queue System Errors

// 402 — Insufficient balance
{
  "error": "Insufficient Balance",
  "message": "Your wallet does not have enough balance."
}

// 400 — Model not found
{
  "error": "Model not found",
  "message": "Model 'longcat-image-498' not found or is disabled"
}

Error via Status/Webhook

{
  "request_id": "longcat-image-498_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "ERROR",
  "model_id": "longcat-image-498",
  "error": "Description of the error",
  "output": null
}

Retrieving Results

Poll the universal status endpoint to check progress and retrieve results.

Endpoint

GET https://gateway.pixazo.ai/v2/requests/status/{request_id}
Ocp-Apim-Subscription-Key: YOUR_API_KEY

cURL Example

curl -H "Ocp-Apim-Subscription-Key: YOUR_API_KEY" \
  "https://gateway.pixazo.ai/v2/requests/status/longcat-image-498_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"

Response (Completed)

{
  "request_id": "longcat-image-498_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "COMPLETED",
  "model_id": "longcat-image-498",
  "error": null,
  "output": {
    "media_url": [
      "https://pub-582b7213209642b9b995c96c95a30381.r2.dev/v1/longcat-image-498_019dxxxx-xxxx/output.ext"
    ],
    "media_type": "application/octet-stream"
  },
  "created_at": "2026-03-31T10:00:00.000Z",
  "updated_at": "2026-03-31T10:00:15.000Z",
  "completed_at": "2026-03-31T10:00:15.000Z"
}

Response Fields

Field	Type	Description
request_id	string	Unique request identifier
status	string	QUEUED, PROCESSING, COMPLETED, FAILED, or ERROR
model_id	string	Model that processed the request
error	string\|null	Error message if failed
output.media_url	array	URLs to generated media (R2 CDN)
output.media_type	string	MIME type of the output
created_at	string	When request was created
completed_at	string\|null	When request completed
polling_url	string	Status URL (initial response only)

Status Values

Status	Description
QUEUED	Request accepted, waiting to be processed
PROCESSING	Being processed by the model
COMPLETED	Done — output contains the result
FAILED	Failed — check error field
ERROR	System error — not charged

Status Flow

QUEUED → PROCESSING → COMPLETED
                    → FAILED
                    → ERROR

Typical Workflow

Send a generate request to the API endpoint
Save the request_id from the response
Poll every 5-10 seconds: GET /v2/requests/status/{request_id}
When status is "COMPLETED", download from output.media_url

Tip: Use X-Webhook-URL header to get a callback instead of polling.

LongCat v1 Text to Image API Pricing

Resolution	Price (USD)
Per Generation	$0.13