# Sana 1.5 1.6B AI Image Generator

> NVIDIA’s lightweight Sana 1.5 checkpoint for efficient open-model generation all the way to 4K.

Canonical URL: https://allimageai.com/models/sana-1-5-1-6b/

Website: All Image AI

Language: English

Sana 1.5 1.6B is NVIDIA’s compact inference-scaling checkpoint for efficient high-resolution synthesis. It exposes custom dimensions up to 4K, named style presets and familiar guidance, step, negative-prompt and seed controls.

## Model details

- Developer: NVIDIA
- Status on All Image AI: Active
- Last verified: 2026-08-25
- Maximum output: 4K
- Modes: Text to Image
- Reference images: not supported
- Resolutions: 1K, 2K, 4K
- Aspect ratios: 1:1, 16:9, 9:16, 4:3, 3:4, 3:2, 2:3

## Best for

- Efficient 4K drafts
- Open-weight production
- Style exploration
- Lower-memory workflows

## How to use

1. Write the complete visual brief.
2. Start at 1K and eighteen steps.
3. Compare fixed seeds or style presets.
4. Render only the winner at 2K or 4K.

## Settings explained

### Style

Uses one of Sana’s documented presets; leave it unset when the prompt already defines a medium.

### Resolution

Iterate at 1K because provider cost follows output megapixels; reserve 4K for the chosen seed.

## Prompt examples

### High-resolution landscape

> Layered volcanic coast at sunrise, black sand, sea mist, tiny research cabin for scale, richly textured cinematic matte painting

### Styled object

> Mechanical songbird made of brass and blue enamel, perched on a simple branch, precise product illustration, clean negative space

## Limitations

- Fine detail trails the 4.8B checkpoint
- Text-to-image only
- 4K output is materially more expensive than 1K

## Pricing and credits

Credits for one image at default quality and mode. Resolution, quality, reference inputs, edit mode and output count can change the total. Check the Generate button before submitting.

| Resolution | Credits / image |
| --- | --- |
| 1K | 1 |
| 2K | 3 |
| 4K | 9 |

Failed generations cost 0 credits. Catalog availability does not guarantee runtime availability; the workspace reports whether the selected model can run.

[Credit plans](https://allimageai.com/pricing.md)

## Test results

Testing in progress. No verified benchmark scores have been published for this model.

## Commercial use and image handling

Sana 1.5 is released under Apache 2.0; generated use remains subject to applicable law and service terms.

Uploads are processed by the configured inference service. You can delete a generation from your history.

## Frequently asked questions

### Should I choose 1.6B or 4.8B?

Choose 1.6B for efficiency and 4.8B when extra detail is worth more latency.

### Is Sana 1.5 open source?

The official NVIDIA repository is Apache 2.0 and publishes the Sana 1.5 training and inference stack.

## Release history and sources

March 16, 2025 — Weights and model code released

This date applies to the event shown. Later API access, weights and availability on All Image AI may have different dates.

- [github.com](https://github.com/NVlabs/Sana)

[Event evidence on the timeline](https://allimageai.com/timeline/#event-sana-1-5-1-6b)

## Other versions

- [Sana 1.5 4.8B](https://allimageai.com/models/sana-1-5-4-8b.md): 4.8B · up to 4K
- [Sana Sprint](https://allimageai.com/models/sana-sprint.md): 1 credit · up to 4K