Nano Banana 3.1 Flash

Fast, high-volume AI image generation. Generate and edit images from text prompts with reference images, aspect ratios, and resolutions up to 4K.

POST/v1/media/queue

~$0.10 est.

Overview

Fast, high-volume image generation via Google's Nano Banana 3. Generates and edits images from text prompts with optional reference images.

Property	Value
Model ID	`google/nano-banana-3-flash`
Upstream Model	`gemini-3.1-flash-image-preview`
Billing	Token-based (dynamic)
Input Price	$1.00 / 1M tokens
Output Price (image)	$120.00 / 1M tokens
Typical Cost	~$0.10 per image

Usage

All media models use the async job queue. Submit a job, then poll for the result.

Step 1: Submit Job

Text-to-Image

const res = await fetch('https://api.yepapi.com/v1/media/queue', {
  method: 'POST',
  headers: {
    'x-api-key': 'YOUR_API_KEY',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    model: 'google/nano-banana-3-flash',
    prompt: 'A futuristic city skyline at sunset with flying vehicles',
    options: { aspectRatio: '16:9' },
  }),
});
const { data } = await res.json();
// data.jobId — use this to poll for results
// data.status — "pending"

curl -X POST https://api.yepapi.com/v1/media/queue \
  -H "x-api-key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "google/nano-banana-3-flash", "prompt": "A futuristic city skyline at sunset", "options": {"aspectRatio": "16:9"}}'

Image-to-Image (Edit / Transform)

Pass a reference image via imageData alongside your prompt to edit or transform an existing image.

const res = await fetch('https://api.yepapi.com/v1/media/queue', {
  method: 'POST',
  headers: {
    'x-api-key': 'YOUR_API_KEY',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    model: 'google/nano-banana-3-flash',
    prompt: 'Make the sky purple and add northern lights',
    options: { aspectRatio: '16:9' },
    imageData: {
      mimeType: 'image/png',
      base64: '...', // Base64-encoded image
    },
  }),
});

Step 2: Poll for Result

const status = await fetch(`https://api.yepapi.com/v1/media/status/${data.jobId}`, {
  headers: { 'x-api-key': 'YOUR_API_KEY' },
});
const { data: job } = await status.json();
// job.status — "pending" | "processing" | "completed" | "failed"
// job.result.image — { mimeType, base64 } when completed

curl https://api.yepapi.com/v1/media/status/JOB_ID \
  -H "x-api-key: YOUR_API_KEY"

Request Body

Parameter	Type	Required	Description	Default
`model`	`string`	Yes	`google/nano-banana-3-flash`	—
`prompt`	`string`	Yes	Text description of the image to generate or edit	—
`options.aspectRatio`	`string`	No	Aspect ratio (1:1, 2:3, 3:2, 3:4, 4:3, 9:16, 16:9)	`1:1`
`options.resolution`	`string`	No	Output resolution (512, 1K, 2K, 4K) — 512 Flash only	`1K`
`imageData.mimeType`	`string`	No	MIME type of input image (image/png, image/jpeg, image/webp)	—
`imageData.base64`	`string`	No	Base64-encoded input image for image-to-image editing	—

Features

Text-to-image and image-to-image (edit/transform) in one endpoint
Up to 14 reference images for guided generation
Aspect ratios: 1:1, 2:3, 3:2, 3:4, 4:3, 9:16, 16:9, and more
Resolutions: 512 (Flash only), 1K, 2K, 4K
Thinking mode for complex prompts
Google Search grounding

Under the Hood

Nano Banana 3.1 Flash

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