GPT Image Hub API Docs

All v1 endpoints except model listing require an API key in the Authorization header. The raw key is shown once at creation time; the server stores only a hash.

Authorization: Bearer gih_live_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

The models endpoint returns model IDs, providers, supported aspect ratios, supported qualities, reference image limits, and credits per image.

curl https://your-domain.com/api/v1/models

curl https://your-domain.com/api/v1/images/generations \
  -H "Authorization: Bearer gih_live_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-image-2",
    "prompt": "A cinematic product photo with premium studio lighting",
    "aspect_ratio": "auto",
    "quality": "1K",
    "n": 1
  }'

curl https://your-domain.com/api/v1/images/generations \
  -H "Authorization: Bearer gih_live_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" \
  -F "model=gpt-image-2" \
  -F "prompt=Use the reference image and render it as a premium studio product shot" \
  -F "aspect_ratio=auto" \
  -F "quality=1K" \
  -F "n=1" \
  -F "reference_image=@./reference.png"

The credits endpoint returns the balance, account type, and upcoming credit expiration for the user that owns the API key.

curl https://your-domain.com/api/v1/credits \
  -H "Authorization: Bearer gih_live_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"

The image generation endpoint is synchronous. Credits are charged before generation and refunded automatically when the provider fails. Use JSON for text-only generation and multipart/form-data for reference images.

JSON request

curl https://your-domain.com/api/v1/images/generations \
  -H "Authorization: Bearer gih_live_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-image-2",
    "prompt": "A cinematic product photo of a transparent perfume bottle on black marble",
    "aspect_ratio": "1:1",
    "quality": "1K",
    "n": 1
  }'

Reference image request

curl https://your-domain.com/api/v1/images/generations \
  -H "Authorization: Bearer gih_live_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" \
  -F "model=gpt-image-2" \
  -F "prompt=Use the reference image and render it as a premium studio product shot" \
  -F "aspect_ratio=1:1" \
  -F "quality=1K" \
  -F "n=1" \
  -F "reference_image=@./reference.png"

Response

{
  "object": "image_generation",
  "id": "clx_generation_log_id",
  "status": "succeeded",
  "model": "gpt-image-2",
  "aspect_ratio": "1:1",
  "quality": "1K",
  "images": [
    {
      "id": "clx_image_id",
      "object": "image",
      "url": "https://cdn.example.com/generations/user/image.png",
      "created_at": "2026-04-30T08:00:00.000Z"
    }
  ],
  "usage": {
    "credits": 1
  },
  "balance": {
    "credits": 119,
    "account_type": "PRO",
    "next_expiration": null
  }
}

Use the id returned by the generation endpoint to retrieve its saved log and image URLs. API keys can only read generations owned by the same user.

curl https://your-domain.com/api/v1/generations/clx_generation_log_id \
  -H "Authorization: Bearer gih_live_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"

{
  "error": {
    "message": "Invalid request body",
    "code": "invalid_request"
  }
}

• The generation endpoint is synchronous and has a maximum duration of 600 seconds.
• n must be between 1 and 4.
• Reference images support PNG, JPG, JPEG, and WebP. Each file can be up to 50MB.
• The maximum reference image count is defined by each model's reference_image_limit.
• This version does not include webhooks, async job queues, or a separate API rate limit.