GoogleFastUltra
Nano Banana 2.1
Google's latest fast image generation model — the high-efficiency counterpart to Nano Banana Pro. Builds on Nano Banana 2 with sharper output, better text rendering, and real-time grounding while keeping Flash-family speed and cost. Features conversational editing, multi-image fusion with up to 14 reference images, Google Web / Image Search grounding, and resolutions up to 4K.
79 credits
per image (1K), 120 for 2K, 260 for 4K
Sharper output and better text rendering than Nano Banana 2
Accurate multilingual text in signage, posters, labels, and infographics
Google Web Search and Image Search grounding for real-time context
Up to 14 reference images for editing and multi-image fusion
Up to 4K output resolution (1K, 2K, 4K)
Extreme aspect ratios: 1:4, 4:1, 1:8, 8:1
Run it right now
Test this model instantly in the Console Playground — no code required
Use with AI Assistant
Copy usage instructions for Claude, ChatGPT, or other AI
Quick Start
curl -X POST "https://api.core.today/v1/predictions" \
-H "Content-Type: application/json" \
-H "X-API-Key: cdt_your_api_key" \
-d '{
"model": "google/nano-banana-2.1",
"input": {
"prompt": "A vibrant storefront window display for a bakery called \"CORE.TODAY\", with the name spelled out in elegant hand-painted gold lettering on the glass, fresh pastries and banana bread artfully arranged inside, warm morning light, photorealistic, highly detailed",
"aspect_ratio": "16:9",
"resolution": "1K",
"output_format": "jpg"
}
}'Parameters
| Parameter | Type | Required | Default | Description |
|---|---|---|---|---|
prompt | string | Yes | - | A text description of the image you want to generate |
image_input | array | No | [] | Input images to transform or use as reference (supports up to 14 images) |
aspect_ratio | string | No | match_input_image | Aspect ratio of the generated image match_input_image1:11:41:82:33:23:44:14:34:55:48:19:1616:921:9 |
resolution | string | No | 1K | Resolution of the generated image. Higher resolutions take longer to generate. 1K2K4K |
google_search | boolean | No | false | Use Google Web Search grounding for real-time information (weather, sports scores, recent events) |
image_search | boolean | No | false | Use Google Image Search grounding for visual context. Enabling this also enables web search. |
output_format | string | No | jpg | Format of the output image jpgpng |
How to Provide File Input
There are 3 ways to provide files for the image_input parameter:
Recommended
Image URL
Pass a publicly accessible URL directly. With the Storage API (POST /v1/files/upload-url) the file uploads straight to S3 (50MB per file) and you pass the returned file_url.
{
"model": "google/nano-banana-2.1",
"input": {
"prompt": "your prompt here",
"image_input": ["https://example.com/image.jpg"]
}
}Direct Upload (Multipart)
Attach files directly to POST /v1/predictions/upload. No separate upload step, but the bytes pass through the API server so the whole request is capped at 10MB.
curl -X POST "https://api.core.today/v1/predictions/upload" \
-H "X-API-Key: cdt_your_api_key" \
-F "model=google/nano-banana-2.1" \
-F 'input={"prompt":"your prompt here"}' \
-F "file:image_input=@your_file.png"See the File Upload docs for more upload methods including Presigned URLs.
Common Parameters
Common parameters used when calling POST /v1/predictions.
| Parameter | Type | Required | Default | Description |
|---|---|---|---|---|
model | string | Yes | - | Model identifier |
input | object | Yes | - | Object containing the model-specific parameters from the table above |
output_folder | string | No | - | Folder path for output files (max 256 chars, '..' not allowed) |
webhook_url | string | No | - | Webhook URL to call on completion |
is_public | boolean | No | false | If true, output files are also available via permanent public URLs |
Examples
Text Rendering in a Scene
Render a brand name as hand-painted lettering on a storefront window
curl -X POST "https://api.core.today/v1/predictions" \
-H "Content-Type: application/json" \
-H "X-API-Key: cdt_your_api_key" \
-d '{
"model": "google/nano-banana-2.1",
"input": {
"prompt": "A vibrant storefront window display for a bakery called \"CORE.TODAY\", with the name spelled out in elegant hand-painted gold lettering on the glass, fresh pastries and banana bread artfully arranged inside, warm morning light, photorealistic, highly detailed",
"aspect_ratio": "16:9",
"resolution": "1K",
"output_format": "jpg"
}
}'Photorealistic Close-up
Generate a playful photorealistic image with golden hour lighting
curl -X POST "https://api.core.today/v1/predictions" \
-H "Content-Type: application/json" \
-H "X-API-Key: cdt_your_api_key" \
-d '{
"model": "google/nano-banana-2.1",
"input": {
"prompt": "a photorealistic close-up of a ripe banana wearing tiny sunglasses on a beach, golden hour lighting",
"aspect_ratio": "16:9",
"resolution": "1K"
}
}'Tips & Best Practices
1Cheapest way to get Nano Banana quality — 1K costs 79 credits, less than half of Nano Banana 2
2Text rendering is sharper than Nano Banana 2 — put exact wording in quotes for signage, posters, and labels
3Use google_search for real-time data (weather, sports, news); image_search adds web images as visual context
4Use 1K (79 credits) for drafts and 4K (260 credits) only for final production assets
5Set aspect_ratio to match_input_image when editing to keep the original framing
6Combine up to 14 reference images with a text prompt for style fusion and character consistency
Use Cases
Typography, logos, and branding with accurate multilingual text
Infographics and posters that need clean, readable text
Real-time data visualization using Google Search grounding
Conversational image editing with reference images
High-resolution content production up to 4K at Flash-level cost
Model Info
ProviderGoogle
Version-
CategoryImage Generation
Price79 credits
API Endpoint
POST /v1/predictions