Image Generation

HiAPI supports maintained image generation models through Images API and Chat Completions API formats.

Available Models

Model	Provider	Best For	Endpoint
Nano Banana	Google	Fast conversational image generation	/v1/chat/completions
Nano Banana 2	Google	Balanced quality and throughput	/v1/chat/completions
Nano Banana Pro	Google	Premium brand visuals and higher resolution	/v1/chat/completions
GPT Image 1.5	OpenAI	Text rendering and layout-heavy assets	/v1/images/generations
GPT Image 2	OpenAI	Chat-compatible prompt-heavy image workflows	/v1/chat/completions
GPT Image 2 Beta	OpenAI	Preview testing and comparisons	/v1/images/generations
FLUX 1.1 Pro	Black Forest Labs	Photorealistic commercial visuals	/v1/images/generations
Qwen Image 2.0	Alibaba	Chinese text rendering and cost-aware images	/v1/images/generations

For live prices and quality multipliers, use HiAPI Pricing.

API Formats

OpenAI Images API (/v1/images/generations)

Used by: GPT Image 1.5, GPT Image 2 Beta, FLUX 1.1 Pro, Qwen Image 2.0

Python

from openai import OpenAI

client = OpenAI(
    api_key="YOUR_API_KEY",
    base_url="https://api.hiapi.ai/v1"
)

response = client.images.generate(
    model="qwen-image-2.0",
    prompt="a futuristic city at sunset",
    size="1024x1024"
)

print(response.data[0].url)

cURL

curl -X POST https://api.hiapi.ai/v1/images/generations \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "qwen-image-2.0",
    "prompt": "a futuristic city at sunset",
    "size": "1024x1024"
  }'

Chat Completions API (/v1/chat/completions)

Used by: Nano Banana, Nano Banana 2, Nano Banana Pro, and GPT Image 2.

Python

import requests

response = requests.post(
    "https://api.hiapi.ai/v1/chat/completions",
    headers={
        "Authorization": "Bearer YOUR_API_KEY",
        "Content-Type": "application/json"
    },
    json={
        "model": "Nano-Banana",
        "stream": False,
        "messages": [{"role": "user", "content": "a cute cat wearing sunglasses"}],
        "extra_body": {
            "google": {
                "image_config": {"aspect_ratio": "1:1", "image_size": "1K"}
            }
        }
    }
)

# Response contains ![image](data:image/jpeg;base64,...)
print(response.json()["choices"][0]["message"]["content"])

Supported Sizes

Most models support these sizes:

• 1024x1024 (square, default)
• 1792x1024 (landscape)
• 1024x1792 (portrait)

Nano Banana also supports 1024x768 and 768x1024.

Tips

• Use English prompts for best results across all models
• Be specific — “a golden retriever playing fetch on a beach at sunset” works better than “a dog”
• Specify style — add keywords like “watercolor”, “photorealistic”, “cyberpunk” at the end
• Try multiple models — each model has different strengths