SkyReels, Wan 2.7, and LTX-Video 2.3
Explore the most advanced open-source video generation models: SkyReels V4 with native audio, Wan 2.7 with first/last-frame control, and LTX-Video 2.3 with 4K at 50fps.
🌌 SkyReels — The Most Advanced Open Source
O SkyReels evolved rapidly since its first version, and V4 marks a historic moment: it’s the the first open-source model to generate video + audio simultaneously at 1080p at 32fps.
| Version | Innovation | Resolution/FPS |
|---|---|---|
| SkyReels V2 | First competitive version, diffusion-based | 720p / 24fps |
| SkyReels V3 | Best visual quality, longer clips | 1080p / 24fps |
| SkyReels V4 | First open-source model with native dual video and audio | 1080p / 32fps |
What does “dual nativo” mean?
SkyReels V4 generates video and audio in parallel during the same diffusion process, rather than as post-processing. This results in much better synchronization between sound and image — footsteps line up with footstep sounds, and falling objects make noise on the exact frame they hit.
🎭 Wan 2.7 — Alibaba's Giant
O Wan 2.7, developed by Alibaba, is a fully open-source model with 27 billion parameters. It is the open-source model with the most available control features:
- • First/Last Frame Control — Define exactly how the video starts and ends; AI fills in the intermediate frames
- • 5 Reference Videos — Use up to 5 reference videos to guide style, motion, and composition
- • Clips up to 15 seconds — Longer than most open-source models
- • Natural Language Editing — Edit existing videos by describing changes in text
- • 27B parameters — One of the largest open-source video models
First/Last Frame Control in practice
Example: Set the first frame to “a person sitting in an office” and the last frame to “the same person running in a park.” Wan 2.7 generates the entire transition between them smoothly and coherently. Perfect for storytelling and creative transitions.
⚡ LTX-Video 2.3 — Speed and Resolution
O LTX-Video 2.3 stands out for two impressive numbers: Native 4K at 50fps e 18x faster than Wan 2.2. With 22 billion parameters, it is the fastest open-source model in its category.
4K
Native resolution
50fps
Frames per second
18x
Faster than Wan 2.2
LTX-Video 2.3 also generates native audio alongside video, following a trend started by Google Veo and now adopted by the open-source community.
When to choose LTX-Video
If you need 4K resolution and/or a high frame rate (slow motion, sports, nature), LTX-Video 2.3 is the best open-source option. For creative control (first/last frame), choose Wan 2.7.
🏭 Other relevant open-source models
HunyuanVideo (Tencent)
Tencent model focused on cinematic realism. Good for scenes with people and urban environments. Open source with a permissive license.
CogVideoX (Zhipu AI)
Focused on artistic, stylized video. Excellent for animation, motion graphics, and creative non-photorealistic content.
Open-Sora 2.0
Community project inspired by OpenAI's Sora. Focused on long clips and extended narratives. Still under active development.
💻 Hardware Requirements
| Model | Minimum VRAM | Recommended VRAM | Recommended GPU |
|---|---|---|---|
| SkyReels V4 | 16 GB | 24 GB | RTX 4090 |
| Wan 2.7 (14B) | 16 GB | 24 GB | RTX 4090 |
| Wan 2.7 (27B) | 24 GB | 48 GB | A6000 / 2x RTX 4090 |
| LTX-Video 2.3 | 16 GB | 24 GB | RTX 4090 |
| HunyuanVideo | 12 GB | 24 GB | RTX 3090/4090 |
☁️ Local vs Cloud
Run locally
- ✅ No cost per generation
- ✅ Full data privacy
- ✅ No usage limits
- ❌ Upfront hardware investment
- ❌ Electricity consumption
- ❌ Technical maintenance required
Run in the cloud
- ✅ No hardware investment
- ✅ Access to powerful GPUs (A100, H100)
- ✅ On-demand scalability
- ❌ Cost per hour/generation
- ❌ Data in the provider's cloud
- ❌ Network latency
Popular cloud services
RunPod ($0.39/h RTX 4090), Vast.ai (marketplace with variable pricing), Google Colab Pro ($9.99/month), Lambda Labs ($1.10/h A100). For ComfyUI in the cloud, RunPod and Vast.ai offer preconfigured templates.
📊 Comparison: SkyReels V4 vs Wan 2.7 vs LTX-Video 2.3
| Aspect | SkyReels V4 | Wan 2.7 | LTX-Video 2.3 |
|---|---|---|---|
| Resolution | 1080p | 1080p | 4K |
| FPS | 32fps | 24fps | 50fps |
| Native audio | ✅ Dual | ❌ | ✅ |
| First/Last Frame | ❌ | ✅ | ❌ |
| Video reference | Limited | 5 videos | 1 video |
| Speed | Medium | Slow | Fast (18x) |
| Parameters | ~15B | 27B | 22B |
| Best for | Video + audio | Creative control | 4K and speed |