Nano Banana 2 API

Gemini 3.1 Flash native image generation with improved quality and advanced features including multi-subject reference and high-fidelity style transfer

Endpoint

POST https://api.hedra.com/v3/models/nano-banana-2

Example request

curl -X POST "https://api.hedra.com/v3/models/nano-banana-2" \
  -H "Authorization: Key $HEDRA_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"input": {"prompt": "a cinematic shot of a city at dusk"}}'

Parameters

promptstringrequired

Generation prompt.

num_outputsinteger

Number of outputs generated per job. Only 1 is supported.

enhance_promptboolean

Rewrite the prompt before generation. An LLM expands it into a fuller description and the model receives that text instead of the submitted one; the result's `prompt` reports what ran.

aspect_ratiostringrequired

Output aspect ratio.

resolutionstringrequired

Output resolution.

imagesarray

Images to edit or blend, at most 10 high-fidelity objects and 4 characters. 1 to 14 images, each at most 30 MB.

seedinteger

Seed for reproducible output; omit for a random seed.