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---
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license: apache-2.0
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language:
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- en
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pipeline_tag: text-to-image
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library_name: diffusers
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---
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<h1 align="center">⚡️- Image<br><sub><sup>An Efficient Image Generation Foundation Model with Single-Stream Diffusion Transformer</sup></sub></h1>
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<div align="center">
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[](https://tongyi-mai.github.io/Z-Image-blog/) 
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[](https://github.com/Tongyi-MAI/Z-Image) 
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[](https://huggingface.co/Tongyi-MAI/Z-Image) 
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[](https://huggingface.co/spaces/Tongyi-MAI/Z-Image) 
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[](https://www.modelscope.cn/models/Tongyi-MAI/Z-Image) 
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[](https://www.modelscope.cn/aigc/imageGeneration?tab=advanced&versionId=569345&modelType=Checkpoint&sdVersion=Z_IMAGE&modelUrl=modelscope%3A%2F%2FTongyi-MAI%2FZ-Image%3Frevision%3Dmaster) 
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<a href="https://arxiv.org/abs/2511.22699" target="_blank"><img src="https://img.shields.io/badge/Report-b5212f.svg?logo=arxiv" height="21px"></a>
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Welcome to the official repository for the Z-Image（造相）project!
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</div>
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## 🎨 Z-Image
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**Z-Image** is the foundation model of the ⚡️- Image family, engineered for good quality, robust generative diversity, broad stylistic coverage, and precise prompt adherence.
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While Z-Image-Turbo is built for speed,
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Z-Image is a full-capacity, undistilled transformer designed to be the backbone for creators, researchers, and developers who require the highest level of creative freedom.
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### 🌟 Key Features
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- **Undistilled Foundation**: As a non-distilled base model, Z-Image preserves the complete training signal. It supports full Classifier-Free Guidance (CFG), providing the precision required for complex prompt engineering and professional workflows.
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- **Aesthetic Versatility**: Z-Image masters a vast spectrum of visual languages—from hyper-realistic photography and cinematic digital art to intricate anime and stylized illustrations. It is the ideal engine for scenarios requiring rich, multi-dimensional expression.
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- **Enhanced Output Diversity**: Built for exploration, Z-Image delivers significantly higher variability in composition, facial identity, and lighting across different seeds, ensuring that multi-person scenes remain distinct and dynamic.
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- **Built for Development**: The ideal starting point for the community. Its non-distilled nature makes it a good base for LoRA training, structural conditioning (ControlNet) and semantic conditioning.
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- **Robust Negative Control**: Responds with high fidelity to negative prompting, allowing users to reliably suppress artifacts and adjust compositions.
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### 🆚 Z-Image vs Z-Image-Turbo
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| Aspect | Z-Image | Z-Image-Turbo |
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|------|------|------|
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| CFG | ✅ | ❌ |
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| Steps | 28~50 | 8 |
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| Fintunablity | ✅ | ❌ |
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| Negative Prompting | ✅ | ❌ |
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| Diversity | High | Low |
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| Visual Quality | High | Very High |
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| RL | ❌ | ✅ |
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## 🚀 Quick Start
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### Installation & Download
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Install the latest version of diffusers:
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```bash
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pip install git+https://github.com/huggingface/diffusers
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```
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Download the model:
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```bash
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pip install -U huggingface_hub
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HF_XET_HIGH_PERFORMANCE=1 hf download Tongyi-MAI/Z-Image
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```
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### Recommended Parameters
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- **Resolution:** 512×512 to 2048×2048 (total pixel area, any aspect ratio)
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- **Guidance scale:** 3.0 – 5.0
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- **Inference steps:** 28 – 50
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### Usage Example
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```python
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import torch
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from diffusers import ZImagePipeline
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# Load the pipeline
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pipe = ZImagePipeline.from_pretrained(
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"Tongyi-MAI/Z-Image",
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torch_dtype=torch.bfloat16,
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low_cpu_mem_usage=False,
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)
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pipe.to("cuda")
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# Generate image
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prompt = "两名年轻亚裔女性紧密站在一起，背景为朴素的灰色纹理墙面，可能是室内地毯地面。左侧女性留着长卷发，身穿藏青色毛衣，左袖有奶油色褶皱装饰，内搭白色立领衬衫，下身白色裤子；佩戴小巧金色耳钉，双臂交叉于背后。右侧女性留直肩长发，身穿奶油色卫衣，胸前印有“Tun the tables”字样，下方为“New ideas”，搭配白色裤子；佩戴银色小环耳环，双臂交叉于胸前。两人均面带微笑直视镜头。照片，自然光照明，柔和阴影，以藏青、奶油白为主的中性色调，休闲时尚摄影，中等景深，面部和上半身对焦清晰，姿态放松，表情友好，室内环境，地毯地面，纯色背景。"
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negative_prompt = "" # Optional, but would be powerful when you want to remove some unwanted content
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image = pipe(
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prompt=prompt,
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negative_prompt=negative_prompt,
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height=1280,
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width=720,
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cfg_normalization=False,
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num_inference_steps=50,
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guidance_scale=4,
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generator=torch.Generator("cuda").manual_seed(42),
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).images[0]
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image.save("example.png")
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```
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### Troubleshooting |
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- Flash-Attention (optional): native inference defaults to PyTorch SDPA. If you see an error like "Requires Flash-attention version ...", either install a compatible flash-attn version or force native SDPA with `ZIMAGE_ATTENTION=_native_flash`. |
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- ComfyUI: This repo does not ship ComfyUI nodes. If you use ComfyUI, keep plugins updated; outdated comfyui-dev-utils has been reported to break after ComfyUI core updates. Please report ComfyUI-specific crashes in the ComfyUI repo with logs. |
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## 📜 Citation |
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If you find our work useful in your research, please consider citing: |
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```bibtex |
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@article{team2025zimage, |
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title={Z-Image: An Efficient Image Generation Foundation Model with Single-Stream Diffusion Transformer}, |
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author={Z-Image Team}, |
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journal={arXiv preprint arXiv:2511.22699}, |
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year={2025} |
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} |
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``` |
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