OpenAI Image Generation API — GPT-Image-2 Reference

Overview of image generation APIs on APIMaster.ai. Use the OpenAI-compatible images endpoint with GPT-Image-2 for text-to-image, image editing, and async generation tasks at up to 70% off.

Image generation overview

Image APIs live under https://apimaster.ai/v1. Documented models:

Model	Description	Doc
`gpt-image-2`	Unified model; auto-routes by params (mask, quality, n>1)	GPT-Image-2
`gemini-3.1-flash-image-preview`	Google Gemini text/image-to-image, up to 4K	Gemini 3.1 Flash Image

Conventions

Auth: Authorization: Bearer YOUR_API_KEY (get key)
Submit: POST https://apimaster.ai/v1/images/generations → task_id
Poll: GET https://apimaster.ai/v1/tasks/{task_id} (wait 10–20s before first poll, then every 3–5s)

Quick example

curl -s "https://apimaster.ai/v1/images/generations" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-image-2",
    "prompt": "An orange cat watching sunset, watercolor",
    "size": "16:9",
    "resolution": "2k"
  }'