720p4-12s Duration24fps~60s Generation8+ LanguagesNative Audio

Seedance 1.5 Pro — AI Video Generation with Native Audio

ByteDance's Seedance 1.5 Pro AI model generates cinematic videos with synchronized audio, multilingual lip sync in 8+ languages, and professional camera control — all in about 60 seconds.

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What Is Seedance 1.5 Pro?

Seedance 1.5 Pro (internally versioned as seedance-v1.5-pro) is ByteDance's flagship AI video generation model, released in December 2025. Built on a dual-branch MMDiT (Multimodal Diffusion Transformer) architecture with 4.5 billion parameters, the Seedance 1.5 Pro model is the first to natively generate both video and synchronized audio in a single forward pass — eliminating the need for separate audio generation or post-processing pipelines.

Unlike conventional AI video generators, the Seedance Pro 1.5 model treats audio and visual signals as unified outputs of the same diffusion process, achieving natural lip synchronization across 8+ languages and precise sound-effect alignment with on-screen actions. This makes Seedance 1.5 a breakthrough for creating talking-head videos, multilingual ads, and cinematic short clips.

Seedance 1.5 Pro Key Features

🎬

Native Audio-Video Generation

Dual-branch MMDiT architecture generates synchronized audio and video in a single pass — no post-processing or separate audio models required.

🗣️

Multilingual Lip Sync

Industry-leading lip synchronization across 8+ languages including English, Mandarin, Cantonese, Japanese, Korean, French, German, and Spanish.

🎥

Cinematic Camera Control

Professional camera movements including pan, tilt, zoom, dolly, arc shots, and the iconic Hitchcock zoom — all from text prompts.

⚡

Fast Generation (~60s)

Generate complete videos with audio in approximately 60 seconds, enabling rapid creative iteration and prototyping workflows.

🔄

Multiple Generation Modes

Supports text-to-video, image-to-video, and keyframe interpolation — flexible input options for every creative workflow.

🎞️

Professional Quality Output

720p resolution at 24fps with multiple aspect ratios (16:9, 9:16, 1:1). Optimized for social media and professional content.

Seedance 1.5 Pro AI Video Examples

Dialogue scene with lip syncComing soon
Cinematic camera movementComing soon
Multilingual narrationComing soon
Image-to-video generationComing soon

Seedance 1.5 Pro vs Sora 2 vs Veo 3.1

FeatureSeedance 1.5 ProSora 2Veo 3.1
DeveloperByteDanceOpenAIGoogle
Max Resolution720p1080p1080p
Max Duration12s12s8s
Native AudioYesYesYes
Lip SyncExcellent (8+ languages)GoodExcellent
Languages8+English primaryLimited
Generation Speed~60sVariable60-90s
Physics SimulationGoodVery GoodVery Good
Complex ActionLimitedVery GoodGood
Character ConsistencyGoodVery GoodExcellent
Text RenderingPoorGoodGood

✓ Best For

  • ✓Dialogue scenes with lip sync
  • ✓Multi-language content & ads
  • ✓Short-form social media videos
  • ✓Fast iteration & prototyping
  • ✓Cinematic camera movements

⚠ Not Ideal For

  • ⚠High-resolution production (720p max)
  • ⚠Complex action sequences
  • ⚠Long-form video content
  • ⚠Text-heavy scenes (signage, labels)

How to Write Prompts for Seedance 1.5 Pro

Prompt Formula

For the best results, structure your prompts using this formula:

Subject+Movement+Environment+Camera+Aesthetic+Sound

Example Prompts

A young woman in a red coat walks through a snowy Tokyo street at night, speaking in Japanese. Camera follows behind her in a slow dolly shot. Neon signs reflect on the wet pavement. Cinematic lighting, film grain. Sound of footsteps crunching on snow and distant city traffic.
Close-up of a barista pouring latte art in a cozy café. Warm golden hour light streams through the window. Slow zoom into the cup as the foam pattern forms. Sound of steaming milk and soft background jazz music.

Key Tips

  • •Include audio descriptions (dialogue, ambient sounds, music) to leverage Seedance 1.5 Pro's native audio generation.
  • •Specify the language for spoken dialogue to activate multilingual lip sync (e.g., "speaking in French").
  • •Use specific camera terminology: pan, tilt, dolly, arc, zoom, tracking shot, Hitchcock zoom.
  • •Keep prompts descriptive but concise — 2-4 sentences work best for Seedance 1.5.
  • •Add aesthetic cues: "cinematic", "film grain", "golden hour", "anime style" to guide the visual style.

Seedance 1.5 Pro FAQ

What is Seedance 1.5 Pro?
Seedance 1.5 Pro (also known as seedance-v1.5-pro or Seedance v1.5 Pro) is ByteDance's AI video generation model released in December 2025. Built on a dual-branch MMDiT (Multimodal Diffusion Transformer) architecture with 4.5 billion parameters, the Seedance 1.5 Pro model generates high-quality videos with natively synchronized audio, multilingual lip sync, and cinematic camera control.
Is Seedance 1.5 Pro free to use?
Yes! SeeAI offers free credits to new users, so you can try Seedance 1.5 Pro at no cost. After your free credits are used, you can purchase additional credits or subscribe to a plan. Check our pricing page for detailed Seedance 1.5 Pro pricing and credit packages.
Does Seedance 1.5 Pro have an API?
SeeAI does not currently offer direct API access for Seedance 1.5 Pro. However, you can use our web platform to generate videos instantly without any integration work. If you need Seedance 1.5 Pro API access for programmatic use, ByteDance offers an official API through BytePlus ModelArk.
What languages does Seedance 1.5 Pro support for lip sync?
Seedance 1.5 Pro supports lip synchronization in 8+ languages: English, Mandarin Chinese, Cantonese, Japanese, Korean, French, German, and Spanish. This makes it ideal for creating multilingual marketing content and localized video ads.
Seedance 1.5 Pro vs Seedance 2.0 — what's the difference?
Seedance 2.0 is the newer model with improved resolution (up to 1080p), better physics simulation, and enhanced character consistency. Seedance 1.5 Pro remains a strong choice for fast generation (~60s), excellent multilingual lip sync, and cost-effective video production. Choose Seedance 1.5 Pro for speed and multilingual content; choose Seedance 2.0 for higher resolution and complex scenes.
What resolution does Seedance 1.5 Pro support?
Seedance 1.5 Pro generates videos at up to 720p resolution with 24fps frame rate. It supports multiple aspect ratios including 16:9 (landscape), 9:16 (portrait/vertical), and 1:1 (square), making it versatile for different platforms and use cases.
How to use Seedance 1.5 Pro online?
Using Seedance 1.5 Pro AI on SeeAI is simple: 1) Sign up for a free account, 2) Navigate to the text-to-video or image-to-video tool, 3) Select 'Seedance 1.5 Pro' as your model, 4) Enter your prompt and click Generate. Your video with synchronized audio will be ready in about 60 seconds.

Ready to Create with Seedance 1.5 Pro?

Generate AI videos with native audio, multilingual lip sync, and cinematic camera control. Free credits included for new users.

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