GPT Image 2

Provider	OpenAI
Model name	gpt-image-2
Endpoint	/v1/chat/completions
Result	Markdown image content in choices[0].message.content
Pricing	See HiAPI Pricing

GPT Image 2 fits chat-compatible image workflows, especially when prompts include detailed layout, scene, and copy requirements.

Key Parameters

Parameter	Type	Notes
model	string	Use gpt-image-2
messages	array	Standard Chat Completions messages
extra_body.google.image_config.aspect_ratio	string	Common values include auto, 1:1, 16:9, 9:16, 4:3, 3:4
extra_body.google.image_config.image_size	string	Resolution: 1K (default), 2K, 4K. Higher resolution costs more — see Pricing
stream	boolean	Set to false

Limitation: When image_size is "4K", the aspect ratio cannot be "1:1" (square). For 4K output, either lower image_size to "2K", or pick a non-square aspect ratio (16:9, 9:16, 4:3, or 3:4).

Example

curl -X POST https://api.hiapi.ai/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-image-2",
    "stream": false,
    "messages": [{"role": "user", "content": "Create a launch poster for an AI note-taking app with clean typography, dark UI mockup, and subtle neon accent"}],
    "extra_body": {
      "google": {
        "image_config": {"aspect_ratio": "16:9", "image_size": "1K"}
      }
    }
  }'

Next Steps

• Read the Image Generation guide
• Compare with GPT Image 1.5
• Review API Reference