Google Nano Banana

img-mcp currently supports Google's Nano Banana image-generation models, also known as Gemini Flash Image.

What is Nano Banana?

Nano Banana is Google's family of fast, high-quality image-generation models available through the Gemini API. They are designed for text-to-image and image-to-image tasks and offer strong prompt adherence and visual quality.

Available models

Model IDs may change as Google releases updates. Common Nano Banana model IDs include:

• gemini-3.1-flash-image — default, fast, and cost-effective
• gemini-3.1-flash-lite-image — lighter variant for faster generation
• gemini-3-pro-image — higher quality for demanding use cases

You can set the default model with the GOOGLE_IMAGE_MODEL environment variable or override it per request with the model argument.

API endpoint

img-mcp uses the Gemini API interactions endpoint for all image generation calls.

Pricing and quotas

You are responsible for your own API usage and costs. Google may offer free tiers or rate limits that change over time. Check the Gemini API pricing page for current rates and quotas.

Getting an API key

1. Visit Google AI Studio.
2. Sign in with your Google account.
3. Create a new API key.
4. Export it as GOOGLE_API_KEY when running img-mcp.

Regional availability

Gemini API availability and supported models vary by region. If you receive model-not-found errors, confirm that your selected model is available in your region.