Seedance 1.5 Pro
Dual-branch architecture generating audio and video simultaneously — with 4.5 billion parameters and support for 7+ languages.
Max Duration
12 seconds
Resolution
480p, 720p, 1080p
Aspect Ratios
16:9, 9:16, 1:1
Audio
Native audio generation
What makes Seedance 1.5 Pro unique
Unique dual-branch Diffusion Transformer — two parallel branches for video frames and audio waveforms, connected by a cross-modal joint module
4.5 billion parameters trained on ~100 million minutes of audio-video clips
Multi-language audio: Mandarin, English, Japanese, Korean, Spanish, Indonesian, and regional dialects
10x inference speedup through distillation and quantization — generates in 45 seconds to 3 minutes
Multiple resolution tiers: quick previews at 480p, production at 1080p
Millisecond-level audio-video synchronization
Best for
How Seedance 1.5 Pro works
Seedance 1.5 Pro uses a unique Dual-Branch Diffusion Transformer with 4.5 billion parameters. Two parallel branches — one for video frames, one for audio waveforms — are connected by a cross-modal joint module that ensures millisecond-level synchronization. Trained on approximately 100 million minutes of audio-video clips, it generates both modalities simultaneously rather than sequentially.
How to use Seedance 1.5 Pro on Flashloop
Select Seedance 1.5 Pro
Open Flashloop and choose Seedance 1.5 Pro from the model selector in the video creator.
Enter your prompt
Describe what you want to see in your video — be as detailed as you like.
Generate & download
Hit generate and your video will be ready in seconds. Download or share directly.
Ready to create with Seedance 1.5 Pro?
Start generating videos with Seedance 1.5 Pro on Flashloop — available on iOS, Android, and web.
Start Creating with Seedance 1.5 Pro