Nano Banana

Provider	Google
Model name	gemini-3-pro-image-preview
Endpoint	/v1/chat/completions
Credits	6 per image
Sizes	1024x1024, 1792x1024, 1024x1792, 1024x768, 768x1024

Features

• 1K/2K/4K resolution support
• Fast generation speed
• High quality output

API Usage

cURL

curl -X POST https://api.hiapi.ai/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gemini-3-pro-image-preview",
    "stream": false,
    "messages": [{"role": "user", "content": "a cute cat wearing sunglasses"}],
    "extra_body": {
      "google": {
        "image_config": {"aspect_ratio": "1:1", "image_size": "1K"}
      }
    }
  }'

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": "gemini-3-pro-image-preview",
        "stream": False,
        "messages": [{"role": "user", "content": "a cute cat wearing sunglasses"}],
        "extra_body": {
            "google": {
                "image_config": {"aspect_ratio": "1:1", "image_size": "1K"}
            }
        }
    }
)

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

Node.js

const response = await fetch("https://api.hiapi.ai/v1/chat/completions", {
  method: "POST",
  headers: {
    "Authorization": "Bearer YOUR_API_KEY",
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    model: "gemini-3-pro-image-preview",
    stream: false,
    messages: [{ role: "user", content: "a cute cat wearing sunglasses" }],
    extra_body: {
      google: {
        image_config: { aspect_ratio: "1:1", image_size: "1K" }
      }
    }
  })
});

const data = await response.json();
// data.choices[0].message.content contains ![image](data:image/jpeg;base64,...)
console.log(data.choices[0].message.content);