Video

Alibaba Cloud

Wan 2.1 API

Wan 2.1 API is an advanced AI-driven video generation interface that transforms text or image inputs into high-quality, realistic videos using state-of-the-art deep learning models.
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import os
from openai import OpenAI

client = OpenAI(
    base_url="https://api.cometapi.com/v1",
    api_key="<YOUR_API_KEY>",    
)

response = client.chat.completions.create(
    model="Wan 2.1",
    messages=[
        {
            "role": "system",
            "content": "You are an AI assistant who knows everything.",
        },
        {
            "role": "user",
            "content": "Tell me, why is the sky blue?"
        },
    ],
)

message = response.choices[0].message.content

print(f"Assistant: {message}")

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alibaba-wan2.1

Wan 2.1 API

Wan 2.1 API is an advanced AI-driven video generation interface that transforms text or image inputs into high-quality, realistic videos using state-of-the-art deep learning models.

Basic Information: What is Wan 2.1?

Wan 2.1 is an AI model developed by Alibaba Cloud, designed to generate high-quality video content from textual or image-based inputs. It leverages advanced deep learning frameworks, including Diffusion Transformers and 3D Variational Autoencoders (VAEs), to synthesize dynamic and visually coherent video clips. As an open-source solution, Wan 2.1 is accessible to a broad range of developers, researchers, and content creators, significantly advancing the capabilities of AI-driven video generation.

Performance Metrics of Wan 2.1

Wan 2.1 has demonstrated exceptional performance in AI-generated video quality, consistently outperforming existing open-source models and rivaling commercial closed-source solutions. The model ranks highly on VBench, a benchmark used to evaluate video generative models, particularly excelling in complex motion generation and multi-object interaction. Compared to earlier iterations, Wan 2.1 offers superior temporal consistency, improved resolution, and reduced artifacts, ensuring a seamless viewing experience.

Technical Details

Architectural Innovations

The model is built on a cutting-edge framework incorporating:

  • 3D Variational Autoencoder (VAE): Enhances spatiotemporal compression and reduces memory usage while maintaining high video quality.
  • Diffusion Transformer (DiT): Implements a full attention mechanism that enables long-term spatiotemporal consistency in video generation.
  • Multi-Stage Training Process: Gradually increases resolution and video duration to optimize training efficiency and computational resource allocation.

Model Variants

To cater to different user needs, it is available in multiple configurations:

  • Wan 2.1-T2V-14B: A 14-billion-parameter text-to-video model optimized for high-quality, realistic video synthesis.
  • Wan 2.1-T2V-1.3B: A more accessible 1.3-billion-parameter model requiring only 8.19 GB of VRAM, allowing consumer-grade GPUs to generate 5-second 480p videos in approximately 4 minutes.
  • Wan 2.1-I2V-14B-480P & 720P: Image-to-video models supporting different resolutions, designed to convert static images into dynamic video content.

Training Dataset and Preprocessing

The dataset used for Wan 2.1 comprises large-scale, high-quality video sequences carefully curated using a multi-step data cleaning and augmentation process. This ensures the elimination of low-quality data while enhancing visual and motion fidelity. The pretraining process is divided into four stages, gradually refining the model’s ability to handle varying resolutions and motion complexities.

Evolution of Wan 2.1

Wan 2.1 is a direct evolution of earlier AI-driven video generation models, integrating substantial improvements over previous iterations. The transition from conventional generative adversarial networks (GANs) to diffusion-based architectures has significantly enhanced the realism and coherence of generated videos. Furthermore, the adoption of transformer-based attention mechanisms has enabled more sophisticated spatiotemporal modeling, leading to improved performance across multiple evaluation metrics.

Advantages of Wan 2.1

State-of-the-Art Video Generation

Wan 2.1 surpasses existing open-source models in generating realistic videos with complex motion and natural-looking objects.

High Computational Efficiency

The optimized architecture ensures efficient GPU utilization, allowing even consumer-grade hardware to generate high-quality video content.

Versatile Application Potential

Supports text-to-video (T2V) and image-to-video (I2V) generation, making it highly adaptable for various industries, including media, marketing, education, and gaming.

Open-Source Accessibility

Wan 2.1 is available under the Apache 2.0 license, fostering innovation and enabling broader adoption among AI researchers and developers.

Technical Indicators

Benchmark Performance

  • VBench Ranking: Consistently achieves top scores in multi-object interaction and motion complexity categories.
  • Inference Speed: The smaller model variant (1.3B) generates a 5-second 480p video in 4 minutes on an RTX 4090 without requiring optimization techniques like quantization.
  • Memory Utilization: Requires only 8.19 GB of VRAM for efficient processing, making it accessible to a wide range of users.

Application Scenarios

Advertising and Marketing Enables brands to create high-quality promotional videos rapidly, reducing production costs and timelines.

Education and Training Facilitates the development of dynamic instructional content, enhancing engagement and learning experiences.

Entertainment and Content Creation Empowers filmmakers, animators, and content creators with AI-assisted video production tools.

Virtual Reality (VR) and Augmented Reality (AR) Supports the creation of immersive digital experiences through AI-generated video assets.

Related topics：Best 3 AI Music Generation Models of 2025

Conclusion

Wan 2.1 represents a major advancement in AI-driven video generation, setting new benchmarks for quality, efficiency, and accessibility. Its combination of state-of-the-art machine learning architectures, high computational efficiency, and open-source availability makes it a valuable tool across various industries. As AI continues to push the boundaries of creativity and automation, it exemplifies the potential of generative models in reshaping digital content creation.

How to call Wan 2.1 API from CometAPI

1.Log in to cometapi.com. If you are not our user yet, please register first

2.Get the access credential API key of the interface. Click “Add Token” at the API token in the personal center, get the token key: sk-xxxxx and submit.

3. Get the url of this site: https://api.cometapi.com/

4. Select the Wan 2.1 endpoint to send the API request and set the request body. The request method and request body are obtained from our website API doc. Our website also provides Apifox test for your convenience.

5. Process the API response to get the generated answer. After sending the API request, you will receive a JSON object containing the generated completion.

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