In this repository, we present Wan2.1, a comprehensive and open suite of video foundation models that pushes the boundaries of video generation. Wan2.1 offers these key features:
👍 SOTA Performance: Wan2.1 consistently outperforms existing open-source models and state-of-the-art commercial solutions across multiple benchmarks.
👍 Supports Consumer-grade GPUs: The T2V-1.3B model requires only 8.19 GB VRAM, making it compatible with almost all consumer-grade GPUs. It can generate a 5-second 480P video on an RTX 4090 in about 4 minutes (without optimization techniques like quantization). Its performance is even comparable to some closed-source models.
👍 Multiple Tasks: Wan2.1 excels in Text-to-Video, Image-to-Video, Video Editing, Text-to-Image, and Video-to-Audio, advancing the field of video generation.
👍 Visual Text Generation: Wan2.1 is the first video model capable of generating both Chinese and English text, featuring robust text generation that enhances its practical applications.
👍 Powerful Video VAE: Wan-VAE delivers exceptional efficiency and performance, encoding and decoding 1080P videos of any length while preserving temporal information, making it an ideal foundation for video and image generation.
Apr 17, 2025: 👋 We introduce Wan2.1FLF2V with its inference code and weights!
Mar 21, 2025: 👋 We are excited to announce the release of the Wan2.1technical report. We welcome discussions and feedback!
Mar 3, 2025: 👋 Wan2.1's T2V and I2V have been integrated into Diffusers (T2V | I2V). Feel free to give it a try!
Feb 27, 2025: 👋 Wan2.1 has been integrated into ComfyUI. Enjoy!
Feb 25, 2025: 👋 We've released the inference code and weights of Wan2.1.
Community Works
If your work has improved Wan2.1 and you would like more people to see it, please inform us.
Phantom has developed a unified video generation framework for single and multi-subject references based on Wan2.1-T2V-1.3B. Please refer to their examples.
UniAnimate-DiT, based on Wan2.1-14B-I2V, has trained a Human image animation model and has open-sourced the inference and training code. Feel free to enjoy it!
CFG-Zero enhances Wan2.1 (covering both T2V and I2V models) from the perspective of CFG.
TeaCache now supports Wan2.1 acceleration, capable of increasing speed by approximately 2x. Feel free to give it a try!
DiffSynth-Studio provides more support for Wan2.1, including video-to-video, FP8 quantization, VRAM optimization, LoRA training, and more. Please refer to their examples.
📑 Todo List
Wan2.1 Text-to-Video
Multi-GPU Inference code of the 14B and 1.3B models
Checkpoints of the 14B and 1.3B models
Gradio demo
ComfyUI integration
Diffusers integration
Diffusers + Multi-GPU Inference
Wan2.1 Image-to-Video
Multi-GPU Inference code of the 14B model
Checkpoints of the 14B model
Gradio demo
ComfyUI integration
Diffusers integration
Diffusers + Multi-GPU Inference
Wan2.1 First-Last-Frame-to-Video
Multi-GPU Inference code of the 14B model
Checkpoints of the 14B model
Gradio demo
ComfyUI integration
Diffusers integration
Diffusers + Multi-GPU Inference
Wan2.1 VACE
Multi-GPU Inference code of the 14B and 1.3B models
The 1.3B model is capable of generating videos at 720P resolution. However, due to limited training at this resolution, the results are generally less stable compared to 480P. For optimal performance, we recommend using 480P resolution.
For the first-last frame to video generation, we train our model primarily on Chinese text-video pairs. Therefore, we recommend using Chinese prompt to achieve better results.
This repository supports two Text-to-Video models (1.3B and 14B) and two resolutions (480P and 720P). The parameters and configurations for these models are as follows:
Task
Resolution
Model
480P
720P
t2v-14B
✔️
✔️
Wan2.1-T2V-14B
t2v-1.3B
✔️
❌
Wan2.1-T2V-1.3B
(1) Without Prompt Extension
To facilitate implementation, we will start with a basic version of the inference process that skips the prompt extension step.
Single-GPU inference
python generate.py --task t2v-14B --size 1280*720 --ckpt_dir ./Wan2.1-T2V-14B --prompt "Two anthropomorphic cats in comfy boxing gear and bright gloves fight intensely on a spotlighted stage."
If you encounter OOM (Out-of-Memory) issues, you can use the --offload_model True and --t5_cpu options to reduce GPU memory usage. For example, on an RTX 4090 GPU:
python generate.py --task t2v-1.3B --size 832*480 --ckpt_dir ./Wan2.1-T2V-1.3B --offload_model True --t5_cpu --sample_shift 8 --sample_guide_scale 6 --prompt "Two anthropomorphic cats in comfy boxing gear and bright gloves fight intensely on a spotlighted stage."
💡Note: If you are using the T2V-1.3B model, we recommend setting the parameter --sample_guide_scale 6. The --sample_shift parameter can be adjusted within the range of 8 to 12 based on the performance.
If you want to use Ulysses strategy, you should set --ulysses_size $GPU_NUMS. Note that the num_heads should be divisible by ulysses_size if you wish to use Ulysess strategy. For the 1.3B model, the num_heads is 12 which can't be divided by 8 (as most multi-GPU machines have 8 GPUs). Therefore, it is recommended to use Ring Strategy instead.
Ring Strategy
If you want to use Ring strategy, you should set --ring_size $GPU_NUMS. Note that the sequence length should be divisible by ring_size when using the Ring strategy.
Of course, you can also combine the use of Ulysses and Ring strategies.
sh
1pip install "xfuser>=0.4.1"
2torchrun --nproc_per_node=8 generate.py --task t2v-14B --size 1280*720 --ckpt_dir ./Wan2.1-T2V-14B --dit_fsdp --t5_fsdp --ulysses_size 8 --prompt "Two anthropomorphic cats in comfy boxing gear and bright gloves fight intensely on a spotlighted stage."
(2) Using Prompt Extension
Extending the prompts can effectively enrich the details in the generated videos, further enhancing the video quality. Therefore, we recommend enabling prompt extension. We provide the following two methods for prompt extension:
Use the Dashscope API for extension.
Apply for a dashscope.api_key in advance (EN | CN).
Configure the environment variable DASH_API_KEY to specify the Dashscope API key. For users of Alibaba Cloud's international site, you also need to set the environment variable DASH_API_URL to 'https://dashscope-intl.aliyuncs.com/api/v1'. For more detailed instructions, please refer to the dashscope document.
Use the qwen-plus model for text-to-video tasks and qwen-vl-max for image-to-video tasks.
You can modify the model used for extension with the parameter --prompt_extend_model. For example:
DASH_API_KEY=your_key python generate.py --task t2v-14B --size 1280*720 --ckpt_dir ./Wan2.1-T2V-14B --prompt "Two anthropomorphic cats in comfy boxing gear and bright gloves fight intensely on a spotlighted stage" --use_prompt_extend --prompt_extend_method 'dashscope' --prompt_extend_target_lang 'zh'
Using a local model for extension.
By default, the Qwen model on HuggingFace is used for this extension. Users can choose Qwen models or other models based on the available GPU memory size.
For text-to-video tasks, you can use models like Qwen/Qwen2.5-14B-Instruct, Qwen/Qwen2.5-7B-Instruct and Qwen/Qwen2.5-3B-Instruct.
For image-to-video or first-last-frame-to-video tasks, you can use models like Qwen/Qwen2.5-VL-7B-Instruct and Qwen/Qwen2.5-VL-3B-Instruct.
Larger models generally provide better extension results but require more GPU memory.
You can modify the model used for extension with the parameter --prompt_extend_model , allowing you to specify either a local model path or a Hugging Face model. For example:
python generate.py --task t2v-14B --size 1280*720 --ckpt_dir ./Wan2.1-T2V-14B --prompt "Two anthropomorphic cats in comfy boxing gear and bright gloves fight intensely on a spotlighted stage" --use_prompt_extend --prompt_extend_method 'local_qwen' --prompt_extend_target_lang 'zh'
(3) Running with Diffusers
You can easily inference Wan2.1-T2V using Diffusers with the following command:
python
1import torch
2from diffusers.utils import export_to_video
3from diffusers import AutoencoderKLWan, WanPipeline
4from diffusers.schedulers.scheduling_unipc_multistep import UniPCMultistepScheduler
56# Available models: Wan-AI/Wan2.1-T2V-14B-Diffusers, Wan-AI/Wan2.1-T2V-1.3B-Diffusers7model_id ="Wan-AI/Wan2.1-T2V-14B-Diffusers"8vae = AutoencoderKLWan.from_pretrained(model_id, subfolder="vae", torch_dtype=torch.float32)9flow_shift =5.0# 5.0 for 720P, 3.0 for 480P10scheduler = UniPCMultistepScheduler(prediction_type='flow_prediction', use_flow_sigmas=True, num_train_timesteps=1000, flow_shift=flow_shift)11pipe = WanPipeline.from_pretrained(model_id, vae=vae, torch_dtype=torch.bfloat16)12pipe.scheduler = scheduler
13pipe.to("cuda")1415prompt ="A cat and a dog baking a cake together in a kitchen. The cat is carefully measuring flour, while the dog is stirring the batter with a wooden spoon. The kitchen is cozy, with sunlight streaming through the window."16negative_prompt ="Bright tones, overexposed, static, blurred details, subtitles, style, works, paintings, images, static, overall gray, worst quality, low quality, JPEG compression residue, ugly, incomplete, extra fingers, poorly drawn hands, poorly drawn faces, deformed, disfigured, misshapen limbs, fused fingers, still picture, messy background, three legs, many people in the background, walking backwards"1718output = pipe(19 prompt=prompt,20 negative_prompt=negative_prompt,21 height=720,22 width=1280,23 num_frames=81,24 guidance_scale=5.0,25).frames[0]26export_to_video(output,"output.mp4", fps=16)
💡Note: Please note that this example does not integrate Prompt Extension and distributed inference. We will soon update with the integrated prompt extension and multi-GPU version of Diffusers.
(4) Running local gradio
sh
1cd gradio
2# if one uses dashscope’s API for prompt extension
3DASH_API_KEY=your_key python t2v_14B_singleGPU.py --prompt_extend_method 'dashscope' --ckpt_dir ./Wan2.1-T2V-14B
45# if one uses a local model for prompt extension
6python t2v_14B_singleGPU.py --prompt_extend_method 'local_qwen' --ckpt_dir ./Wan2.1-T2V-14B
Run Image-to-Video Generation
Similar to Text-to-Video, Image-to-Video is also divided into processes with and without the prompt extension step. The specific parameters and their corresponding settings are as follows:
Task
Resolution
Model
480P
720P
i2v-14B
❌
✔️
Wan2.1-I2V-14B-720P
i2v-14B
✔️
❌
Wan2.1-T2V-14B-480P
(1) Without Prompt Extension
Single-GPU inference
python generate.py --task i2v-14B --size 1280*720 --ckpt_dir ./Wan2.1-I2V-14B-720P --image examples/i2v_input.JPG --prompt "Summer beach vacation style, a white cat wearing sunglasses sits on a surfboard. The fluffy-furred feline gazes directly at the camera with a relaxed expression. Blurred beach scenery forms the background featuring crystal-clear waters, distant green hills, and a blue sky dotted with white clouds. The cat assumes a naturally relaxed posture, as if savoring the sea breeze and warm sunlight. A close-up shot highlights the feline's intricate details and the refreshing atmosphere of the seaside."
💡For the Image-to-Video task, the size parameter represents the area of the generated video, with the aspect ratio following that of the original input image.
Multi-GPU inference using FSDP + xDiT USP
sh
1pip install "xfuser>=0.4.1"
2torchrun --nproc_per_node=8 generate.py --task i2v-14B --size 1280*720 --ckpt_dir ./Wan2.1-I2V-14B-720P --image examples/i2v_input.JPG --dit_fsdp --t5_fsdp --ulysses_size 8 --prompt "Summer beach vacation style, a white cat wearing sunglasses sits on a surfboard. The fluffy-furred feline gazes directly at the camera with a relaxed expression. Blurred beach scenery forms the background featuring crystal-clear waters, distant green hills, and a blue sky dotted with white clouds. The cat assumes a naturally relaxed posture, as if savoring the sea breeze and warm sunlight. A close-up shot highlights the feline's intricate details and the refreshing atmosphere of the seaside."
(2) Using Prompt Extension
The process of prompt extension can be referenced here.
Run with local prompt extension using Qwen/Qwen2.5-VL-7B-Instruct:
python generate.py --task i2v-14B --size 1280*720 --ckpt_dir ./Wan2.1-I2V-14B-720P --image examples/i2v_input.JPG --use_prompt_extend --prompt_extend_model Qwen/Qwen2.5-VL-7B-Instruct --prompt "Summer beach vacation style, a white cat wearing sunglasses sits on a surfboard. The fluffy-furred feline gazes directly at the camera with a relaxed expression. Blurred beach scenery forms the background featuring crystal-clear waters, distant green hills, and a blue sky dotted with white clouds. The cat assumes a naturally relaxed posture, as if savoring the sea breeze and warm sunlight. A close-up shot highlights the feline's intricate details and the refreshing atmosphere of the seaside."
Run with remote prompt extension using dashscope:
DASH_API_KEY=your_key python generate.py --task i2v-14B --size 1280*720 --ckpt_dir ./Wan2.1-I2V-14B-720P --image examples/i2v_input.JPG --use_prompt_extend --prompt_extend_method 'dashscope' --prompt "Summer beach vacation style, a white cat wearing sunglasses sits on a surfboard. The fluffy-furred feline gazes directly at the camera with a relaxed expression. Blurred beach scenery forms the background featuring crystal-clear waters, distant green hills, and a blue sky dotted with white clouds. The cat assumes a naturally relaxed posture, as if savoring the sea breeze and warm sunlight. A close-up shot highlights the feline's intricate details and the refreshing atmosphere of the seaside."
(3) Running with Diffusers
You can easily inference Wan2.1-I2V using Diffusers with the following command:
python
1import torch
2import numpy as np
3from diffusers import AutoencoderKLWan, WanImageToVideoPipeline
4from diffusers.utils import export_to_video, load_image
5from transformers import CLIPVisionModel
67# Available models: Wan-AI/Wan2.1-I2V-14B-480P-Diffusers, Wan-AI/Wan2.1-I2V-14B-720P-Diffusers8model_id ="Wan-AI/Wan2.1-I2V-14B-720P-Diffusers"9image_encoder = CLIPVisionModel.from_pretrained(model_id, subfolder="image_encoder", torch_dtype=torch.float32)10vae = AutoencoderKLWan.from_pretrained(model_id, subfolder="vae", torch_dtype=torch.float32)11pipe = WanImageToVideoPipeline.from_pretrained(model_id, vae=vae, image_encoder=image_encoder, torch_dtype=torch.bfloat16)12pipe.to("cuda")1314image = load_image(15"https://huggingface.co/datasets/huggingface/documentation-images/resolve/main/diffusers/astronaut.jpg"16)17max_area =720*128018aspect_ratio = image.height / image.width
19mod_value = pipe.vae_scale_factor_spatial * pipe.transformer.config.patch_size[1]20height =round(np.sqrt(max_area * aspect_ratio))// mod_value * mod_value
21width =round(np.sqrt(max_area / aspect_ratio))// mod_value * mod_value
22image = image.resize((width, height))23prompt =(24"An astronaut hatching from an egg, on the surface of the moon, the darkness and depth of space realised in "25"the background. High quality, ultrarealistic detail and breath-taking movie-like camera shot."26)27negative_prompt ="Bright tones, overexposed, static, blurred details, subtitles, style, works, paintings, images, static, overall gray, worst quality, low quality, JPEG compression residue, ugly, incomplete, extra fingers, poorly drawn hands, poorly drawn faces, deformed, disfigured, misshapen limbs, fused fingers, still picture, messy background, three legs, many people in the background, walking backwards"2829output = pipe(30 image=image,31 prompt=prompt,32 negative_prompt=negative_prompt,33 height=height, width=width,34 num_frames=81,35 guidance_scale=5.036).frames[0]37export_to_video(output,"output.mp4", fps=16)38
💡Note: Please note that this example does not integrate Prompt Extension and distributed inference. We will soon update with the integrated prompt extension and multi-GPU version of Diffusers.
(4) Running local gradio
sh
1cd gradio
2# if one only uses 480P model in gradio
3DASH_API_KEY=your_key python i2v_14B_singleGPU.py --prompt_extend_method 'dashscope' --ckpt_dir_480p ./Wan2.1-I2V-14B-480P
45# if one only uses 720P model in gradio
6DASH_API_KEY=your_key python i2v_14B_singleGPU.py --prompt_extend_method 'dashscope' --ckpt_dir_720p ./Wan2.1-I2V-14B-720P
78# if one uses both 480P and 720P models in gradio
9DASH_API_KEY=your_key python i2v_14B_singleGPU.py --prompt_extend_method 'dashscope' --ckpt_dir_480p ./Wan2.1-I2V-14B-480P --ckpt_dir_720p ./Wan2.1-I2V-14B-720P
Run First-Last-Frame-to-Video Generation
First-Last-Frame-to-Video is also divided into processes with and without the prompt extension step. Currently, only 720P is supported. The specific parameters and corresponding settings are as follows:
Task
Resolution
Model
480P
720P
flf2v-14B
❌
✔️
Wan2.1-FLF2V-14B-720P
(1) Without Prompt Extension
Single-GPU inference
python generate.py --task flf2v-14B --size 1280*720 --ckpt_dir ./Wan2.1-FLF2V-14B-720P --first_frame examples/flf2v_input_first_frame.png --last_frame examples/flf2v_input_last_frame.png --prompt "CG animation style, a small blue bird takes off from the ground, flapping its wings. The bird’s feathers are delicate, with a unique pattern on its chest. The background shows a blue sky with white clouds under bright sunshine. The camera follows the bird upward, capturing its flight and the vastness of the sky from a close-up, low-angle perspective."
💡Similar to Image-to-Video, the size parameter represents the area of the generated video, with the aspect ratio following that of the original input image.
Multi-GPU inference using FSDP + xDiT USP
sh
1pip install "xfuser>=0.4.1"
2torchrun --nproc_per_node=8 generate.py --task flf2v-14B --size 1280*720 --ckpt_dir ./Wan2.1-FLF2V-14B-720P --first_frame examples/flf2v_input_first_frame.png --last_frame examples/flf2v_input_last_frame.png --dit_fsdp --t5_fsdp --ulysses_size 8 --prompt "CG animation style, a small blue bird takes off from the ground, flapping its wings. The bird’s feathers are delicate, with a unique pattern on its chest. The background shows a blue sky with white clouds under bright sunshine. The camera follows the bird upward, capturing its flight and the vastness of the sky from a close-up, low-angle perspective."
(2) Using Prompt Extension
The process of prompt extension can be referenced here.
Run with local prompt extension using Qwen/Qwen2.5-VL-7B-Instruct:
python generate.py --task flf2v-14B --size 1280*720 --ckpt_dir ./Wan2.1-FLF2V-14B-720P --first_frame examples/flf2v_input_first_frame.png --last_frame examples/flf2v_input_last_frame.png --use_prompt_extend --prompt_extend_model Qwen/Qwen2.5-VL-7B-Instruct --prompt "CG animation style, a small blue bird takes off from the ground, flapping its wings. The bird’s feathers are delicate, with a unique pattern on its chest. The background shows a blue sky with white clouds under bright sunshine. The camera follows the bird upward, capturing its flight and the vastness of the sky from a close-up, low-angle perspective."
Run with remote prompt extension using dashscope:
DASH_API_KEY=your_key python generate.py --task flf2v-14B --size 1280*720 --ckpt_dir ./Wan2.1-FLF2V-14B-720P --first_frame examples/flf2v_input_first_frame.png --last_frame examples/flf2v_input_last_frame.png --use_prompt_extend --prompt_extend_method 'dashscope' --prompt "CG animation style, a small blue bird takes off from the ground, flapping its wings. The bird’s feathers are delicate, with a unique pattern on its chest. The background shows a blue sky with white clouds under bright sunshine. The camera follows the bird upward, capturing its flight and the vastness of the sky from a close-up, low-angle perspective."
(3) Running local gradio
sh
1cd gradio
2# use 720P model in gradio
3DASH_API_KEY=your_key python flf2v_14B_singleGPU.py --prompt_extend_method 'dashscope' --ckpt_dir_720p ./Wan2.1-FLF2V-14B-720P
Run VACE
VACE now supports two models (1.3B and 14B) and two main resolutions (480P and 720P).
The input supports any resolution, but to achieve optimal results, the video size should fall within a specific range.
The parameters and configurations for these models are as follows:
Task
Resolution
Model
480P(~81x480x832)
720P(~81x720x1280)
VACE
✔️
✔️
Wan2.1-VACE-14B
VACE
✔️
❌
Wan2.1-VACE-1.3B
In VACE, users can input text prompt and optional video, mask, and image for video generation or editing. Detailed instructions for using VACE can be found in the User Guide.
The execution process is as follows:
(1) Preprocessing
User-collected materials needs to be preprocessed into VACE-recognizable inputs, including src_video, src_mask, src_ref_images, and prompt.
For R2V (Reference-to-Video Generation), you may skip this preprocessing, but for V2V (Video-to-Video Editing) and MV2V (Masked Video-to-Video Editing) tasks, additional preprocessing is required to obtain video with conditions such as depth, pose or masked regions.
For more details, please refer to vace_preproccess.
You can easily inference Wan2.1-VACE using Diffusers with the following code:
python
1import torch
2import PIL.Image
3from diffusers import AutoencoderKLWan, WanVACEPipeline
4from diffusers.schedulers.scheduling_unipc_multistep import UniPCMultistepScheduler
5from diffusers.utils import export_to_video, load_image
678defprepare_video_and_mask(first_img: PIL.Image.Image, last_img: PIL.Image.Image, height:int, width:int, num_frames:int):9 first_img = first_img.resize((width, height))10 last_img = last_img.resize((width, height))11 frames =[]12 frames.append(first_img)13# Ideally, this should be 127.5 to match original code, but they perform computation on numpy arrays14# whereas we are passing PIL images. If you choose to pass numpy arrays, you can set it to 127.5 to15# match the original code.16 frames.extend([PIL.Image.new("RGB",(width, height),(128,128,128))]*(num_frames -2))17 frames.append(last_img)18 mask_black = PIL.Image.new("L",(width, height),0)19 mask_white = PIL.Image.new("L",(width, height),255)20 mask =[mask_black,*[mask_white]*(num_frames -2), mask_black]21return frames, mask
222324model_id ="Wan-AI/Wan2.1-VACE-1.3B-diffusers"25vae = AutoencoderKLWan.from_pretrained(model_id, subfolder="vae", torch_dtype=torch.float32)26pipe = WanVACEPipeline.from_pretrained(model_id, vae=vae, torch_dtype=torch.bfloat16)27flow_shift =5.0# 5.0 for 720P, 3.0 for 480P28pipe.scheduler = UniPCMultistepScheduler.from_config(pipe.scheduler.config, flow_shift=flow_shift)29pipe.to("cuda")3031prompt ="CG animation style, a small blue bird takes off from the ground, flapping its wings. The bird's feathers are delicate, with a unique pattern on its chest. The background shows a blue sky with white clouds under bright sunshine. The camera follows the bird upward, capturing its flight and the vastness of the sky from a close-up, low-angle perspective."32negative_prompt ="Bright tones, overexposed, static, blurred details, subtitles, style, works, paintings, images, static, overall gray, worst quality, low quality, JPEG compression residue, ugly, incomplete, extra fingers, poorly drawn hands, poorly drawn faces, deformed, disfigured, misshapen limbs, fused fingers, still picture, messy background, three legs, many people in the background, walking backwards"33first_frame = load_image("https://huggingface.co/datasets/huggingface/documentation-images/resolve/main/diffusers/flf2v_input_first_frame.png")34last_frame = load_image("https://huggingface.co/datasets/huggingface/documentation-images/resolve/main/diffusers/flf2v_input_last_frame.png")3536height =51237width =51238num_frames =8139video, mask = prepare_video_and_mask(first_frame, last_frame, height, width, num_frames)4041output = pipe(42 video=video,43 mask=mask,44 prompt=prompt,45 negative_prompt=negative_prompt,46 height=height,47 width=width,48 num_frames=num_frames,49 num_inference_steps=30,50 guidance_scale=5.0,51 generator=torch.Generator().manual_seed(42),52).frames[0]53export_to_video(output,"output.mp4", fps=16)
Above is a demonstration of the First-Last-Frame-to-Video task. The code snippets available in this pull request demonstrate some more examples of how videos can be generated with different control signals.
For more details, check out the diffusers documentation for Wan.
Wan2.1 is a unified model for both image and video generation. Since it was trained on both types of data, it can also generate images. The command for generating images is similar to video generation, as follows:
Through manual evaluation, the results generated after prompt extension are superior to those from both closed-source and open-source models.
(2) Image-to-Video Evaluation
We also conducted extensive manual evaluations to evaluate the performance of the Image-to-Video model, and the results are presented in the table below. The results clearly indicate that Wan2.1 outperforms both closed-source and open-source models.
Computational Efficiency on Different GPUs
We test the computational efficiency of different Wan2.1 models on different GPUs in the following table. The results are presented in the format: Total time (s) / peak GPU memory (GB).
The parameter settings for the tests presented in this table are as follows:
(1) For the 1.3B model on 8 GPUs, set --ring_size 8 and --ulysses_size 1;
(2) For the 14B model on 1 GPU, use --offload_model True;
(3) For the 1.3B model on a single 4090 GPU, set --offload_model True --t5_cpu;
(4) For all testings, no prompt extension was applied, meaning --use_prompt_extend was not enabled.
💡Note: T2V-14B is slower than I2V-14B because the former samples 50 steps while the latter uses 40 steps.
Introduction of Wan2.1
Wan2.1 is designed on the mainstream diffusion transformer paradigm, achieving significant advancements in generative capabilities through a series of innovations. These include our novel spatio-temporal variational autoencoder (VAE), scalable training strategies, large-scale data construction, and automated evaluation metrics. Collectively, these contributions enhance the model’s performance and versatility.
(1) 3D Variational Autoencoders
We propose a novel 3D causal VAE architecture, termed Wan-VAE specifically designed for video generation. By combining multiple strategies, we improve spatio-temporal compression, reduce memory usage, and ensure temporal causality. Wan-VAE demonstrates significant advantages in performance efficiency compared to other open-source VAEs. Furthermore, our Wan-VAE can encode and decode unlimited-length 1080P videos without losing historical temporal information, making it particularly well-suited for video generation tasks.
(2) Video Diffusion DiT
Wan2.1 is designed using the Flow Matching framework within the paradigm of mainstream Diffusion Transformers. Our model's architecture uses the T5 Encoder to encode multilingual text input, with cross-attention in each transformer block embedding the text into the model structure. Additionally, we employ an MLP with a Linear layer and a SiLU layer to process the input time embeddings and predict six modulation parameters individually. This MLP is shared across all transformer blocks, with each block learning a distinct set of biases. Our experimental findings reveal a significant performance improvement with this approach at the same parameter scale.
Model
Dimension
Input Dimension
Output Dimension
Feedforward Dimension
Frequency Dimension
Number of Heads
Number of Layers
1.3B
1536
16
16
8960
256
12
30
14B
5120
16
16
13824
256
40
40
Data
We curated and deduplicated a candidate dataset comprising a vast amount of image and video data. During the data curation process, we designed a four-step data cleaning process, focusing on fundamental dimensions, visual quality and motion quality. Through the robust data processing pipeline, we can easily obtain high-quality, diverse, and large-scale training sets of images and videos.
figure1
Comparisons to SOTA
We compared Wan2.1 with leading open-source and closed-source models to evaluate the performance. Using our carefully designed set of 1,035 internal prompts, we tested across 14 major dimensions and 26 sub-dimensions. We then compute the total score by performing a weighted calculation on the scores of each dimension, utilizing weights derived from human preferences in the matching process. The detailed results are shown in the table below. These results demonstrate our model's superior performance compared to both open-source and closed-source models.
figure1
Citation
If you find our work helpful, please cite us.
@article{wan2025,
title={Wan: Open and Advanced Large-Scale Video Generative Models},
author={Ang Wang and Baole Ai and Bin Wen and Chaojie Mao and Chen-Wei Xie and Di Chen and Feiwu Yu and Haiming Zhao and Jianxiao Yang and Jianyuan Zeng and Jiayu Wang and Jingfeng Zhang and Jingren Zhou and Jinkai Wang and Jixuan Chen and Kai Zhu and Kang Zhao and Keyu Yan and Lianghua Huang and Mengyang Feng and Ningyi Zhang and Pandeng Li and Pingyu Wu and Ruihang Chu and Ruili Feng and Shiwei Zhang and Siyang Sun and Tao Fang and Tianxing Wang and Tianyi Gui and Tingyu Weng and Tong Shen and Wei Lin and Wei Wang and Wei Wang and Wenmeng Zhou and Wente Wang and Wenting Shen and Wenyuan Yu and Xianzhong Shi and Xiaoming Huang and Xin Xu and Yan Kou and Yangyu Lv and Yifei Li and Yijing Liu and Yiming Wang and Yingya Zhang and Yitong Huang and Yong Li and You Wu and Yu Liu and Yulin Pan and Yun Zheng and Yuntao Hong and Yupeng Shi and Yutong Feng and Zeyinzi Jiang and Zhen Han and Zhi-Fan Wu and Ziyu Liu},
journal = {arXiv preprint arXiv:2503.20314},
year={2025}
}
License Agreement
The models in this repository are licensed under the Apache 2.0 License. We claim no rights over the your generated contents, granting you the freedom to use them while ensuring that your usage complies with the provisions of this license. You are fully accountable for your use of the models, which must not involve sharing any content that violates applicable laws, causes harm to individuals or groups, disseminates personal information intended for harm, spreads misinformation, or targets vulnerable populations. For a complete list of restrictions and details regarding your rights, please refer to the full text of the license.
