# Hunyuan Image 2.1 AI Image Generator

> A configurable Hunyuan generation for users who want direct sampling and negative-prompt controls.

Canonical URL: https://allimageai.com/models/hunyuan-image-2-1/

Website: All Image AI

Language: English

Hunyuan Image 2.1 exposes a traditional configurable diffusion workflow: steps, guidance, negative prompt, seed and prompt enhancement. It is useful for reproducible experiments and teams that prefer explicit sampling controls over a mostly automatic image API.

## Model details

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

## Best for

- Controlled diffusion experiments
- Negative-prompt workflows
- Reproducible seed comparisons
- Illustrative scenes

## How to use

1. Start with the 28-step default.
2. Add a short negative prompt only when needed.
3. Fix the seed before tuning Guidance.
4. Compare against Hunyuan Image 3 for final selection.

## Settings explained

### Steps

The documented default is 28; extra steps cost time and rarely rescue a weak prompt.

### Negative Prompt

Names unwanted defects such as blur, watermarks or malformed detail.

## Prompt examples

### Character illustration

> Anthropomorphic penguin plush in a painting studio, red knitted scarf and beret, soft window light, tactile fabric detail

### Environment study

> Ancient observatory above a cloud layer, brass instruments, pale dawn, painterly realism, calm blue palette

## Limitations

- Older than Hunyuan Image 3
- Text-to-image only
- High per-megapixel cost

## 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 | 15 |

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

Commercial use is governed by Tencent’s Hunyuan licence and the selected service terms.

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

## Frequently asked questions

### Why keep 2.1 when Image 3 exists?

It exposes direct steps and negative-prompt controls that the Instruct generation route does not.

### What Guidance should I start with?

Use the documented 3.5 default, then change one setting at a time with a fixed seed.

## Release history and sources

September 8, 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/Tencent-Hunyuan/HunyuanImage-2.1)

[Event evidence on the timeline](https://allimageai.com/timeline/#event-hunyuan-image-2-1)

## Other versions

- [Hunyuan Image 3 Instruct](https://allimageai.com/models/hunyuan-image-3-instruct.md): Prompt expansion · 1K
- [Hunyuan Image 3.0](https://allimageai.com/models/hunyuan-image-3.md): Base model · 2K