Nano Banana 2

ID:google/nano-banana-2

Nano Banana 2 image generation API by Google — Gemini 3.1 Flash with 4K output, 15 aspect ratios, and character consistency for up to 5 characters.

Text to imageImage editingReference images4KText rendering

Overview

Nano Banana 2 image generation API by Google — Gemini 3.1 Flash with 4K output, 15 aspect ratios, and character consistency for up to 5 characters.

Authentication

All API requests require a valid API key passed via the Authorization header using the Bearer scheme.

Quickstart

Credentials

Set the RUNBASE_API_KEY environment variable.

Shell

export RUNBASE_API_KEY=your-api-key

Create a run

Shell

curl -s https://runbase.net/api/v1/runs \
  -H "Authorization: Bearer $RUNBASE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "google/nano-banana-2",
    "input": {
      "prompt": "A cinematic product photo of a ceramic lamp"
    }
  }'

Runs

Runs are processed asynchronously. Submit a request, then poll for the result.

Create a run

Shell

curl -s https://runbase.net/api/v1/runs \
  -H "Authorization: Bearer $RUNBASE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "google/nano-banana-2",
    "input": { "prompt": "A cinematic product photo of a ceramic lamp" }
  }'

Get run status

Shell

curl -s https://runbase.net/api/v1/runs/RUN_ID \
  -H "Authorization: Bearer $RUNBASE_API_KEY"

Get result

Poll the status endpoint until status is "succeeded", then read output.urls from the response.

Input Schema

Parameter	Type	Required	Description
prompt	string	Required	Prompt
aspect_ratio	string	Optional	Aspect ratioOptions: `1:11:41:82:33:23:44:14:34:55:48:19:1616:921:9auto`
resolution	string	Optional	ResolutionOptions: `1K2K4K`
image_urls	string[]	Optional	Reference images

Output Schema

Field	Type	Description
urls	string[]	Generated output URLs

Errors

The API uses standard HTTP status codes to indicate success or failure.

Status Code	Description
400	Invalid request - missing or malformed parameters
401	Authentication failed - missing or invalid API key
402	Insufficient credits
403	Forbidden - IP not allowed or API key credit limit exceeded
404	Run not found
429	Rate limit exceeded
500	Internal server error