Install the belt CLI skill: npx skills add belt-sh/cli

Nano Banana 2 - Gemini 3.1 Flash Image Preview

Generate images with Google Gemini 3.1 Flash Image Preview via inference.sh CLI.

Quick Start

Requires inference.sh CLI (belt). Install instructions

belt login

belt app run google/gemini-3-1-flash-image-preview --input '{"prompt": "a banana in space, photorealistic"}'

Examples

Basic Text-to-Image

belt app run google/gemini-3-1-flash-image-preview --input '{

  "prompt": "A futuristic cityscape at sunset with flying cars"

}'

Multiple Images

belt app run google/gemini-3-1-flash-image-preview --input '{

  "prompt": "Minimalist logo design for a coffee shop",

  "num_images": 4

}'

Custom Aspect Ratio

belt app run google/gemini-3-1-flash-image-preview --input '{

  "prompt": "Panoramic mountain landscape with northern lights",

  "aspect_ratio": "16:9"

}'

Image Editing (with input images)

belt app run google/gemini-3-1-flash-image-preview --input '{

  "prompt": "Add a rainbow in the sky",

  "images": ["https://example.com/landscape.jpg"]

}'

High Resolution (4K)

belt app run google/gemini-3-1-flash-image-preview --input '{

  "prompt": "Detailed illustration of a medieval castle",

  "resolution": "4K"

}'

With Google Search Grounding

belt app run google/gemini-3-1-flash-image-preview --input '{

  "prompt": "Current weather in Tokyo visualized as an artistic scene",

  "enable_google_search": true

}'

Input Options

Parameter

Type

Description

prompt

string

Required. What to generate or change

images

array

Input images for editing (up to 14). Supported: JPEG, PNG, WebP

num_images

integer

Number of images to generate

aspect_ratio

string

Output ratio: "1:1", "16:9", "9:16", "4:3", "3:4", "auto"

resolution

string

"1K", "2K", "4K" (default: 1K)

output_format

string

Output format for images

enable_google_search

boolean

Enable real-time info grounding (weather, news, etc.)

Output

Field

Type

Description

images

array

The generated or edited images

description

string

Text description or response from the model

output_meta

object

Metadata about inputs/outputs for pricing

Prompt Tips

Styles: photorealistic, illustration, watercolor, oil painting, digital art, anime, 3D render

Composition: close-up, wide shot, aerial view, macro, portrait, landscape

Lighting: natural light, studio lighting, golden hour, dramatic shadows, neon

Details: add specific details about textures, colors, mood, atmosphere

Sample Workflow

# 1. Generate sample input to see all options

belt app sample google/gemini-3-1-flash-image-preview --save input.json

# 2. Edit the prompt

# 3. Run

belt app run google/gemini-3-1-flash-image-preview --input input.json

Python SDK

from inferencesh import inference

client = inference()

# Basic generation

result = client.run({

    "app": "google/gemini-3-1-flash-image-preview@0c7ma1ex",

    "input": {

        "prompt": "A banana in space, photorealistic"

    }

})

print(result["output"])

# Stream live updates

for update in client.run({

    "app": "google/gemini-3-1-flash-image-preview@0c7ma1ex",

    "input": {

        "prompt": "A futuristic cityscape at sunset"

    }

}, stream=True):

    if update.get("progress"):

        print(f"progress: {update['progress']}%")

    if update.get("output"):

        print(f"output: {update['output']}")

Related Skills

# Original Nano Banana (Gemini 3 Pro Image, Gemini 2.5 Flash Image)

npx skills add inference-sh/skills@nano-banana

# Full platform skill (all 250+ apps)

npx skills add inference-sh/skills@infsh-cli

# All image generation models

npx skills add inference-sh/skills@ai-image-generation

Browse all image apps: belt app store --category image

Documentation

• Running Apps - How to run apps via CLI

• Streaming Results - Real-time progress updates

• File Handling - Working with images