Using Nano Banana 2 (Gemini 3.1 Flash Image Preview) on Google AI Studio

Implementation guide · Gemini 3.1 · Google DeepMind

Serverless

Quick Start

1
Create an account at Google AI Studio and generate an API key.
2
Use the Google AI Studio SDK or REST API to call gemini-3.1-flash-image-preview — see the documentation for request format.
3
You'll be billed $0.50/1M input, $60.00/1M output tokens. See full pricing.

API Portal Documentation Pricing

Code Examples

Install

pip install google-genai

API key

GOOGLE_API_KEY

Model ID

gemini-3.1-flash-image-preview

Use the model name directly, e.g. "gemini-2.0-flash", "gemini-1.5-pro", or "gemini-2.5-pro-preview-05-06".

import os
from google import genai

client = genai.Client(api_key=os.environ["GOOGLE_API_KEY"])
response = client.models.generate_content(
    model="gemini-3.1-flash-image-preview",
    contents="Hello"
)
print(response.text)

About Google AI Studio

Google AI Studio is a model prototyping environment and API access point for Gemini models, offering an inference playground for developers to test and build AI applications.

View all models on Google AI Studio →

Pricing on Google AI Studio

Type	Price (per 1M)
Input tokens	$0.50
Output tokens	$60.00

Capabilities

No model capability flags are currently sourced.

About Nano Banana 2 (Gemini 3.1 Flash Image Preview)

Preview release of Nano Banana 2 for Gemini 3.1 Flash Image. Google released the GA gemini-3.1-flash-image model on 2026-05-28 and will retire this preview API ID on 2026-06-25.

Full model details →

Model Specs

Released2026-03-03

Context66k

ArchitectureDecoder Only

Knowledge cutoff2025-01