Seedance

Overview

Seedance 1.5 Pro is ByteDance's advanced audio-visual generation model, released on December 15, 2025. Unlike its predecessor (Seedance 1.0, which focused solely on video), version 1.5 Pro introduces native audio generation—producing synchronized dialogue, sound effects, and ambient audio in a single inference pass. This reduces the need for separate audio post-production in many short-form content workflows. Built on a dual-branch Diffusion Transformer architecture with cross-modal joint modules, the model delivers multilingual lip-syncing and dynamic camera control. The technical report describes post-training optimizations (SFT and RLHF) and an acceleration framework that boosts inference speed by over 10×.

Seedance 1.5 Pro is designed for professional-grade content creation scenarios: multi-shot narrative videos, localized advertising campaigns, and cinematic storytelling. It supports both text-to-video and image-to-video workflows. The model is accessible via ByteDance's Volcano Engine platform, targeting enterprise and creative studio workflows requiring high-fidelity audio-visual synchronization.

What's New

Native Audio-Visual Joint Generation

Seedance 1.5 Pro's most significant advancement is its unified audio-video generation pipeline. The model produces synchronized voiceovers and spatial audio effects alongside visual content, streamlining workflows for many short-form applications. This is powered by a dual-branch Diffusion Transformer architecture that processes audio and video latents in parallel, with a cross-modal joint module ensuring frame-level synchronization. For content creators producing short dramas, product demos, or social media clips, this can significantly reduce production time.

The model can generate diverse voices and spatial sound effects that coordinate with the visuals. Because the model is designed for joint audio-video generation, it aims to improve audio-visual synchronization compared with stitching separate pipelines.

Multilingual & Dialect-Specific Lip-Sync

The model delivers lip-sync capabilities across a wide range of languages and dialects, addressing a critical pain point in localized content production. Seedance 1.5 Pro aims to generate videos with phonetically accurate mouth movements and motion alignment across different linguistic contexts. This is achieved through specialized training on audio-visual articulation patterns.

For international marketing teams, this feature enables more cost-effective localization: text prompts can generate region-specific versions of content with native-language dialogue. The model aims to maintain consistent character identity across language variants while adapting articulation.

Cinematic Camera Control & Enhanced Composition

Building on Seedance 1.0's multi-shot capabilities, version 1.5 is positioned for film-grade cinematography with complex camera movement, composition, and atmosphere. Users can specify camera movements through text prompts—panning shots, tracking movements, and dynamic camera work—with the model aiming to generate smooth, physically plausible motion.

This is particularly valuable for directors visualizing pre-production storyboards or indie filmmakers working without physical camera equipment. ByteDance reports strong performance in internal benchmarks (SeedVideoBench-1.5), though detailed quality breakdowns are not fully public.

Performance Optimization & Acceleration

Seedance 1.5 Pro achieves over 10× inference speedup compared to baseline diffusion models through a proprietary acceleration framework. The technical report mentions this acceleration framework improves inference speed significantly, while implementation details may vary by deployment.

Generation latency depends on deployment configuration and workload. ByteDance has not publicly standardized end-to-end timing benchmarks, but the acceleration aims to enable more practical workflows for iterative creative testing and rapid content production.

Availability & Access

Access Channels

Seedance 1.5 Pro is accessible via ByteDance's Volcano Engine platform, and ByteDance also provides a "Try Now" entry on the Seedance page. Access requirements may vary by region and account type. Developers can integrate Seedance 1.5 Pro via API endpoints, submitting text prompts or image references and receiving video files with embedded audio tracks.

Geographic & Account Requirements

ByteDance has not publicly unified all access policy details on the model page. Users should check Volcano Engine console requirements and regional availability directly. International availability may vary; users should follow local laws and the platform's terms when accessing the service.

System Requirements & Limitations

For API Users (Cloud-Based):

• Internet Bandwidth: Stable connection required for video generation and delivery.
• Storage: Users should provision storage for batch workflows; export formats and file sizes are not consistently disclosed on public pages.

Technical Constraints:

Specific output specifications (resolution, frame rate, duration limits) are not consistently disclosed on public pages. Users should consult official Volcano Engine documentation or contact ByteDance for confirmed technical specifications.

Early Access Constraints:

As a newly released model (December 2025), Seedance 1.5 Pro is in a controlled rollout phase. API rate limits and generation quotas may apply. Users should expect occasional capacity restrictions during peak usage hours.

Pricing & Plans

Public pricing for Seedance 1.5 Pro is not disclosed on the model page. The model is accessible through Volcano Engine's API system. For confirmed rates and payment structures, users should consult the official Volcano Engine pricing documentation or contact ByteDance sales directly.

Cost Considerations

Pricing structures, free tier availability, and minimum commitments have not been publicly disclosed. Prospective users should contact ByteDance's Volcano Engine team for custom quotes tailored to production volume and specific use case requirements.

Pros & Cons

Pros

• Unified Audio-Visual Workflow — Generates synchronized dialogue, sound effects, and ambience alongside video in a single pass, streamlining production workflows for short-form content.
• Multilingual Lip-Sync Capabilities — Supports lip-sync across multiple languages and dialects, enabling localized advertising and international social media campaigns with reduced production complexity.
• Cinematic Camera Control — Positioned to deliver complex camera movements with dynamic composition, useful for storyboarding and visual pre-production.
• Significant Inference Speedup — Achieves over 10× inference acceleration through proprietary optimization framework, enabling faster iteration for creative workflows.
• High Visual Quality — Reports strong performance in internal benchmarks with coherent multi-shot narrative generation.
• Professional-Grade Positioning — Designed for enterprise and creative studio workflows requiring integrated audio-visual output.

Cons

• Enterprise-Focused Access — Accessible via Volcano Engine platform; access requirements and account policies are not fully disclosed on public pages, which may limit accessibility for individual creators.
• Limited Public Documentation — Technical specifications (resolution, frame rate, duration limits), pricing structures, and regional availability details are not consistently disclosed publicly.
• API-Based Workflow — Cloud-based API integration requires development resources and lacks real-time interactive preview interfaces available in some consumer-oriented tools.
• Pricing Transparency — No public pricing documentation; requires direct contact with Volcano Engine sales for custom quotes, making upfront budget planning challenging.
• Audio Customization — Generated audio is integrated with video; separate editing or replacement of audio elements may require external post-production tools.

Best For

• Enterprise Marketing Teams creating localized video ads requiring multilingual lip-sync capabilities and iteration across regional variants for cross-cultural campaigns.
• Short Drama Production Studios producing serialized content for short-video platforms, where integrated audio-visual generation can streamline production workflows.
• Indie Filmmakers & Directors visualizing pre-production storyboards with cinematic camera movements and atmospheric composition, supporting creative planning phases.
• Product Marketing Agencies generating demo videos with synchronized narration and sound effects for e-commerce, crowdfunding campaigns, or presentations.
• Social Media Content Creators managing high-volume content production where integrated audio-visual workflows can improve efficiency.
• Academic Researchers studying audio-visual generation models, multimodal AI, or computational creativity with access to advanced generation systems.

FAQ