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🆕 Nano Banana2 (Gemini 3.1 Flash) Now Available! The new benchmark for value. Usage is identical to Nano Banana Pro.
  • Great Value: Only $0.055/image, cheaper than Pro
  • 4K Quality: Supports 1K, 2K, 4K resolutions
  • Full Features: Text-to-image + image editing, compatible with OpenAI SDK and Google native format

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🎁 Free Trial

Register and get $0.5 credit toward Nano Banana2 usage

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🚀 Live Demo

AI Images - Try instantly, no code required

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Prerequisites

1 Get API Key Login to laozhang.ai console to get your API key 2 Configure Billing Mode Edit token settings and select one of these billing modes (same price):
  • Pay-per-use Priority (Recommended): Use balance first, auto-switch when insufficient
  • Pay-per-use: Direct charge per request, best for strict budget control
Both modes have identical pricing at $0.055/image, only the billing method differs. Token Settings API calls will fail without proper billing configuration. Complete this setup first!

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Model Overview

Nano Banana2 is LaoZhang API’s custom name for Google’s Gemini 3.1 Flash Image Preview (gemini-3.1-flash-image-preview) model. Built on the latest Gemini 3.1 Flash architecture, it delivers high-quality output with better value. Nano Banana2 usage is identical to Nano Banana Pro - just replace the model name with gemini-3.1-flash-image-preview.

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📋 Nano Banana Model Comparison

ModelModel IDBillingLaoZhang API PriceResolutionSpeedHighlight
Nano Banana Progemini-3-pro-image-previewPer-use$0.09/image1K/2K/4K~10sMost intelligent, complex instructions
Nano Banana2gemini-3.1-flash-image-previewPer-use$0.055/image1K/2K/4K~10sBest value, high quality
Nano Bananagemini-2.5-flash-imagePer-use$0.025/image1K (fixed)~10sBasic, stable & reliable
💡 How to Choose?
  • Ultimate quality & complex instructions: Choose Nano Banana Pro ($0.09/image)
  • Best value for advanced use: Choose Nano Banana2 ($0.055/image)
  • Budget-conscious, basic needs: Choose Nano Banana Standard ($0.025/image)

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🚀 Quick Start: OpenAI Compatible Mode

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Curl Example

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

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Python SDK Example

from openai import OpenAI
import base64
import re

client = OpenAI(
    api_key="sk-YOUR_API_KEY",
    base_url="https://api.yelinai.com/v1"
)

response = client.chat.completions.create(
    model="gemini-3.1-flash-image-preview",
    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")

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🎨 Image Editing

Nano Banana2 also supports image editing, with usage identical to Pro. Simply include reference images and editing instructions in your request, using model name gemini-3.1-flash-image-preview. 
# Image editing example (OpenAI compatible mode)
response = client.chat.completions.create(
    model="gemini-3.1-flash-image-preview",
    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"}}
        ]
    }]
)
For more image editing features (multi-image fusion, 4K output, Google native format, etc.), see the Nano Banana Pro Image Editing docs and replace the model name with gemini-3.1-flash-image-preview.

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📖 Complete Usage Guide

Nano Banana2 API calls are identical to Nano Banana Pro, including OpenAI compatible mode and Google native format. Simply replace the model name from gemini-3-pro-image-preview to gemini-3.1-flash-image-preview - no other code changes needed.

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Pro Text-to-Image Guide

4K resolution, Google native format, multiple aspect ratios, complete code examples

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Pro Image Editing Guide

Style transfer, multi-image fusion, 4K HD editing, URL input method

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Token Management

Create and manage your API tokens

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Pricing

View detailed pricing and billing information

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❓ FAQ

What’s the difference between Nano Banana2 and Nano Banana Pro?
FeatureNano Banana ProNano Banana2
Modelgemini-3-pro-image-previewgemini-3.1-flash-image-preview
TechnologyGemini 3 ProGemini 3.1 Flash
Resolution1K/2K/4K1K/2K/4K
Price$0.09/image$0.055/image
API UsageIdenticalIdentical
Both share the same API interface. Banana2 is based on Gemini 3.1 Flash architecture with a more affordable price point. How to migrate from Pro to Banana2? Just change one line of code: replace the model name from gemini-3-pro-image-preview to gemini-3.1-flash-image-preview. Everything else stays the same. Does Banana2 support Google native format? Yes, fully supported! Use this endpoint: 
https://api.yelinai.com/v1beta/models/gemini-3.1-flash-image-preview:generateContent
Supports custom aspect ratios (10 options) and resolutions (1K/2K/4K), same usage as Pro. Does Banana2 support image editing? Yes! Full text-to-image and image editing features. See the Pro Image Editing docs for details.

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📝 Changelog

2026-02: Nano Banana2 Launched 🆕 Nano Banana2 Released
  • Based on Gemini 3.1 Flash architecture
  • Pricing has been synced to the current page rate while keeping the same value positioning
  • Usage identical to Nano Banana Pro
  • Supports text-to-image, image editing, 4K resolution