Wan2.1 (Alibaba)
Wan2.1 is Alibaba's open-source video generation model family — and it's a significant one. Released publicly with weights in January 2025, Wan2.1 benchmarks competitively with the best proprietary video models on multiple quality metrics, while being available to run locally, free of charge, for anyone with sufficient GPU hardware.
Overview
Developed by Alibaba's Tongyi research team, Wan2.1 was released as a fully open-source model under the Apache 2.0 license — meaning anyone can download the weights, run them locally, fine-tune them, and use them commercially. This positioned Wan2.1 as the "DeepSeek moment for video" — a Chinese open-source model that matched or exceeded proprietary Western alternatives.
In April 2026, Wan2.1 remains one of the most capable open-source video models available. The 14B parameter text-to-video (T2V) and image-to-video (I2V) variants are the community's reference points for what open-source video generation can achieve. It runs locally via ComfyUI on high-VRAM workstations, and is available via Alibaba Cloud's Bailian platform as a managed API.
Key Features
- Open-Source Apache 2.0: Full model weights released publicly — free for commercial and research use with no licensing fees.
- Text-to-Video (14B): Generates 480p/720p video from text prompts, with strong understanding of complex prompt details and physical dynamics.
- Image-to-Video (14B): Animates still images with physics-aware motion and strong adherence to the source image composition.
- Multi-Resolution Support: Generates video at various resolutions and aspect ratios (9:16, 16:9, 1:1).
- ComfyUI Integration: Full workflow support in ComfyUI, enabling complex multi-step video generation pipelines.
- Competitive Motion Quality: In academic benchmarks, Wan2.1 scores comparably to commercial models on motion smoothness, physical plausibility, and scene consistency.
- Model Variants: 1.3B (lightweight, runs on 8GB VRAM) and 14B (full quality, requires 24-80GB VRAM depending on quantization).
Model Variants
| Model | Parameters | Min VRAM | Quality | Best For |
|---|---|---|---|---|
| Wan2.1-T2V-1.3B | 1.3B | 8GB | Good | Quick generation, low-end hardware |
| Wan2.1-T2V-14B | 14B | 40GB (bf16) / 24GB (8-bit) | High | Quality generation |
| Wan2.1-I2V-14B | 14B | 40GB (bf16) / 24GB (8-bit) | High | Image animation |
Use Cases
Open-Source Video Pipeline Development
- Build custom video generation workflows without API costs or vendor lock-in.
- Fine-tune on domain-specific data (product videos, architectural renderings, specific styles).
Research & Experimentation
- Academic research on video generation and motion modeling with full model access.
- Testing and benchmarking against other open models.
Enterprise with Data Sovereignty
- Run video generation on-premise for cases where content cannot be sent to cloud APIs.
- Integrate into proprietary creative pipelines without per-video API fees.
Cost-Efficient Scale Generation
- After initial hardware investment, generate unlimited video at zero marginal cost.
- Batch processing of large video generation jobs overnight on GPU clusters.
Getting Started
Option A: Via Alibaba Cloud Bailian (Easiest — API)
- Sign up for Alibaba Cloud.
- Access the Bailian model gallery.
- Enable the Wan2.1 endpoint and obtain an API key.
- Use the REST API for generation.
Option B: Run Locally via ComfyUI (Advanced)
Requirements: NVIDIA GPU with 24GB+ VRAM (RTX 3090/4090/A6000) or 40GB+ for bf16.
# Install ComfyUI:
git clone https://github.com/comfyanonymous/ComfyUI
cd ComfyUI
pip install -r requirements.txt
# Download the ComfyUI-WanVideoWrapper custom node:
cd custom_nodes
git clone https://github.com/kijai/ComfyUI-WanVideoWrapper
# Download Wan2.1 model weights (14B T2V, ~30GB):
# Visit: https://huggingface.co/Wan-AI/Wan2.1-T2V-14B
# Download model shards to ComfyUI/models/wan/
Option C: ModelScope (Cloud Demo)
- Visit modelscope.cn/models/Wan-AI.
- Use the online inference demo (free, limited quota).
- No setup required.
Running via ComfyUI Workflow
- Launch ComfyUI:
python main.py --lowvram(for 24GB cards). - Load a Wan2.1 workflow from the ComfyUI Manager or community.
- Set your text prompt and click "Queue Prompt."
- Generation of a 5-second clip takes 5-20 minutes depending on your GPU.
Prompt Tips for Wan2.1
- Be cinematic: "Tracking shot of a woman walking through autumn forest, golden hour, depth of field."
- Describe physics: "Waves crashing against rocks, slow motion, high contrast water spray."
- Specify camera: "Static camera, wide angle, establishing shot."
- Keep complexity moderate: Wan2.1 handles single-subject scenes more reliably than complex multi-person scenarios.
Pricing & Access
- Model Weights: Free — download from Hugging Face or ModelScope (Apache 2.0).
- Local Inference: Free — you pay only your hardware/electricity costs.
- Alibaba Cloud Bailian (Managed API): Credit-based pricing (volume discounts for enterprise).
- ModelScope Demo: Free with limited daily quota.
Limitations
- Hardware Requirements: The 14B model requires significant GPU VRAM (24-80GB). Not suitable for consumer laptops.
- Generation Speed: Local generation on a single RTX 4090 takes 5-20 minutes per 5-second clip — much slower than cloud APIs.
- Setup Complexity: Running locally via ComfyUI requires technical knowledge and significant initial setup time.
- Resolution Ceiling: Community-run workflows typically generate at 480p-720p — 4K generation requires specialized high-memory configurations.
Community & Support
- Hugging Face: huggingface.co/Wan-AI — model weights and documentation.
- GitHub: github.com/Wan-Video/Wan2.1 — official code repository.
- ModelScope: modelscope.cn — online demos and Chinese community.
- Reddit: r/StableDiffusion — active discussion on Wan2.1 workflows.
- ComfyUI Discord: Active community for ComfyUI + Wan2.1 workflow help.