Nano Banana 2 API Image Generation and Editing

curl -X POST "https://api2.laozhang.ai/v1/chat/completions" \
     -H "Authorization: Bearer $API_KEY" \
     -H "Content-Type: application/json" \
     -d '{
    "model": "gemini-3.1-flash-image",
    "stream": false,
    "messages": [
        {
            "role": "user",
            "content": "a beautiful sunset over mountains"
        }
    ]
}'

from openai import OpenAI
import base64
import re

client = OpenAI(
    api_key="sk-YOUR_API_KEY",
    base_url="https://api2.laozhang.ai/v1"
)

response = client.chat.completions.create(
    model="gemini-3.1-flash-image",
    messages=[
        {
            "role": "user",
            "content": "a beautiful sunset over mountains"
        }
    ]
)

# Extract base64 image data
content = response.choices[0].message.content
match = re.search(r'!\[.*?\]\((data:image/png;base64,.*?)\)', content)

if match:
    base64_data = match.group(1).split(',')[1]
    image_data = base64.b64decode(base64_data)

    with open('output.png', 'wb') as f:
        f.write(image_data)
    print("✅ Image saved: output.png")

# Image editing example (OpenAI compatible mode)
response = client.chat.completions.create(
    model="gemini-3.1-flash-image",
    messages=[{
        "role": "user",
        "content": [
            {"type": "text", "text": "Transform this image into Van Gogh Starry Night style"},
            {"type": "image_url", "image_url": {"url": "https://example.com/your-image.jpg"}}
        ]
    }]
)