Introduction
The AI video generation race has a new front-runner. Seedance 1.5 Pro, ByteDance's latest AI video generator, does something no competitor has fully cracked: it generates dialogue, sound effects, and ambient music at exactly the same moment it renders each frame. The result is a seamlessly synchronized audio-visual experience straight out of the pipeline—no manual audio dubbing required. This guide covers everything you need to unlock its full potential.
What is Seedance 1.5 Pro?
Seedance 1.5 Pro is ByteDance's flagship video generation model, released in 2025 under the Seedance series. It belongs to the dual-branch diffusion transformer family, a 4.5-billion parameter architecture that processes visual and acoustic signals in a single unified pass rather than generating video first and layering audio afterward. The model supports three generation modes—text-to-video, image-to-video, and first-last-frame—giving creators a flexible entry point regardless of their workflow. Video length is fully configurable between 4 and 12 seconds, with resolution options of 480p, 720p, and 1080p. Aspect ratios include 16:9 (landscape), 9:16 (portrait), 1:1 (square), 4:3, 3:4, 21:9 (ultra-wide), and adaptive—covering every modern display context from smartphone reels to cinema screens.
Technical Foundation
The Dual-Branch Diffusion Transformer at the heart of Seedance 1.5 Pro processes a video latent and an audio latent in two parallel branches that share cross-attention layers. This design forces the model to reason about temporal alignment during every diffusion step, which is why its lip-sync reaches millisecond precision rather than approximate synchronization. With 4.5 billion parameters trained on a curated dataset spanning cinematic footage, narrated content, and ambient recordings, the model develops a strong prior for how speech, environment sounds, and music should evolve alongside motion. This is fundamentally different from post-hoc audio models that receive a finished video and estimate matching sound.
The joint training approach also benefits scene understanding. Because the model must predict audio for every frame, it implicitly learns richer semantic content—a character opening a door must produce a creak at the correct moment, rain on glass must match the visual intensity of the storm. These constraints produce video that feels authored rather than assembled.
Key Features
Native Audio-Visual Synchronization
Seedance 1.5 Pro generates audio and video simultaneously, not sequentially. The practical impact of this joint generation approach is dramatic: spoken dialogue appears on screen with lip movements that match phoneme timing at the millisecond level, ambient sounds (rain, crowd noise, traffic) build in intensity as the visual scene changes, and background music adjusts its dynamic range to complement the on-screen energy. The system supports eight languages for spoken content: English, Mandarin Chinese, Japanese, Korean, Spanish, Portuguese, Indonesian, and Cantonese. Multilingual creators can place dialogue in any of these languages within a prompt and expect accurate lip-sync without additional configuration. To optimize dialogue generation, place spoken lines inside double quotation marks in your prompt—for example: The scientist turns to the camera and says: "We changed everything today."
Multi-Resolution Video Quality
Seedance 1.5 Pro offers three distinct resolution tiers, each serving a different production context. At 480p, generation is fast and affordable—ideal for rapid iteration, storyboarding, or social content that will be viewed on small screens. The 720p standard tier delivers a balanced combination of quality and cost that suits most online publishing needs, from YouTube shorts to brand reels. The 1080p high-definition tier produces broadcast-ready output at 24 frames per second, suitable for product demos, film pre-visualization, and any context where image fidelity is non-negotiable. All resolution tiers render at the cinematic standard of 24 fps, ensuring smooth motion regardless of quality level. The wide aspect ratio support—including the 21:9 ultra-wide format popular in cinematic storytelling—means the model adapts to the creative brief rather than forcing creators into fixed frame dimensions.
Versatile Generation Modes
Three generation modes address different stages of the creative process. Text-to-video converts a written prompt directly into a fully realized clip, making it the fastest path from idea to footage. A detailed prompt describing subject, action, environment, lighting, and tone gives the model sufficient context to produce coherent, visually rich results. Image-to-video animates a still image you supply, breathing motion into product shots, character illustrations, or reference photos. This mode is particularly valuable for brands that have existing visual assets and want to extend them into video without a full production shoot. The first-last-frame mode adds an additional layer of creative control by letting you define both the opening composition and the closing composition of the clip; the model fills in all the motion between the two anchors. This is ideal for controlled narrative transitions, brand reveals, and any shot requiring a specific beginning and end state.
Professional Camera Control
Professional cinematographers describe camera movement with a precise vocabulary—pan, tilt, dolly, truck, orbit, crane, push-in, pull-out—and Seedance 1.5 Pro understands all of it. The model supports over 15 distinct camera techniques that can be specified naturally in a text prompt. Writing "slow dolly in toward the subject as the camera tilts up" produces camera behavior that a skilled operator would recognize as intentional. Beyond movement, the model interprets lighting directives. Prompts referencing golden-hour warmth, overcast diffusion, neon-lit environments, or high-contrast noir setups translate into coherent lighting conditions rather than generic illumination. Scene composition understanding means the model respects foreground-background separation, rule-of-thirds framing, and depth cues without requiring technical parameters.
Seedance 1.5 Pro vs Competitors
Seedance 1.5 Pro vs Sora 2
Sora 2 from OpenAI excels at extended video duration—up to 25 seconds—and delivers exceptional physics simulation for complex scenes like crowds, water dynamics, and rigid body interactions. Where Seedance 1.5 Pro holds an edge is generation speed and cost. Seedance completes a 5-second 720p clip in approximately 41 seconds; Sora 2 takes considerably longer for comparable output. For projects requiring synchronized spoken dialogue across multiple languages, Seedance's joint audio-visual architecture is also a more direct solution than adding a separate audio layer after Sora 2 completes. Read the [full Sora 2 guide](/guides/sora-2-video-generator-guide) for a deeper comparison.
Seedance 1.5 Pro vs Veo 3.1 Fast
Google's Veo 3.1 Fast is the benchmark for speed and affordability in the current landscape. It trades some duration flexibility (capped at 8 seconds) for near-instantaneous generation and the lowest cost per clip among flagship models. Seedance 1.5 Pro extends the maximum duration to 12 seconds and introduces the first-last-frame mode, which Veo 3.1 Fast does not offer. For creators who need precise control over a clip's opening and closing frames, or who regularly work beyond the 8-second limit, Seedance is the stronger choice. Explore the [Veo 3.1 Fast guide](/guides/veo-31-fast-video-generator-guide) to understand which tool best fits your workflow.
Seedance 1.5 Pro vs Kling 2.6
Kling 2.6 from Kuaishou has built a strong reputation for motion realism—especially human body movement and gesture accuracy. It supports up to 10-second clips with solid audio generation. Seedance 1.5 Pro pushes further on duration (12 seconds), multilingual lip-sync precision across eight languages, and generation speed. For content requiring realistic character motion in shorter clips, Kling 2.6 remains competitive. For multilingual branded content or projects needing the full 12-second duration, Seedance 1.5 Pro delivers more flexibility.
| Model | Max Duration | Native Audio | Generation Speed | Cost per Clip | Max Resolution | Unique Strength |
|---|---|---|---|---|---|---|
| Seedance 1.5 Pro | 12 seconds | Yes (8 languages) | ~41 seconds (fastest) | $0.28–$0.65 | 1080p | Audio sync + speed |
| Sora 2 | 25 seconds | Yes | Slower | Higher | 1080p | Duration + physics |
| Veo 3.1 Fast | 8 seconds | Yes | Very fast | Lowest | 1080p | Speed + affordability |
| Kling 2.6 | 10 seconds | Yes | Moderate | Moderate | 1080p | Motion realism |
Pricing on CreateVision AI
CreateVision AI uses a credit-based system for Seedance 1.5 Pro, allowing you to pay only for what you generate. Credit consumption scales with three variables: resolution, clip duration, and whether native audio generation is enabled. The ranges below reflect the minimum (shortest clip, no audio) to maximum (longest clip, with audio) for each resolution tier. See the [full pricing page](/pricing) for a complete credit calculator.
| Resolution | Credit Range | Best For |
|---|---|---|
| 480p | 140–780 credits | Rapid prototyping, storyboarding, social shorts |
| 720p | 290–1,710 credits | Standard online publishing, YouTube, brand reels |
| 1080p | 640–3,810 credits | Broadcast delivery, product demos, film pre-viz |
CreateVision AI membership tiers determine your daily and monthly credit allowances. The Free tier provides 80 credits/day—enough to test Seedance 1.5 Pro at 480p with short clips. Premium delivers 1,600 credits/day for regular production use. Ultimate unlocks 4,000 credits/day for high-volume workflows. Credit packs are also available starting from $30 for 4,000 credits, making it straightforward to top up without upgrading your subscription tier.
Why Use Seedance 1.5 Pro on CreateVision AI
No Waitlists, No Regional Restrictions
Access Seedance 1.5 Pro immediately after creating an account. CreateVision AI operates without invite-only queues or geography-based access locks, so creators anywhere in the world can start generating within minutes.
Transparent Credit-Based Pricing
Pay only for what you generate. The credit system gives you granular control over spending—choose 480p for quick ideation and upgrade to 1080p only for final delivery assets. No subscription tier forces you into a flat monthly cost for capabilities you rarely use.
Multi-Model Access in One Platform
CreateVision AI provides access to Seedance 1.5 Pro alongside Sora 2 and Veo 3.1 Fast from a single dashboard. Switching between models requires no separate accounts, API keys, or integrations—compare outputs side by side and choose the best result for each project.
AI Mentor Prompt Enhancement
CreateVision AI's built-in AI Mentor reviews and optimizes your prompts before submission, surfacing improvements to scene description, camera direction, and audio cue language. Better prompts produce better outputs—the AI Mentor shortens the learning curve considerably for creators new to Seedance 1.5 Pro.
27-Language Interface Support
The CreateVision AI platform operates in 27 languages, matching the multilingual audience that Seedance 1.5 Pro serves. Creators who work in Korean, Portuguese, Indonesian, or any other supported language can navigate the platform and write prompts comfortably in their primary language.
Enterprise-Grade API Access
Developers and production studios can integrate Seedance 1.5 Pro directly into their pipelines through the CreateVision AI API. The API supports all three generation modes, the full range of resolution and aspect ratio settings, and callback webhooks for asynchronous task completion—suitable for automated content production at scale.
Getting Started
Seedance 1.5 Pro brings three meaningful advances to AI video generation: joint audio-visual synthesis that eliminates the need for separate audio workflows, a 12-second maximum duration that accommodates complete narrative moments, and a first-last-frame mode that gives directors compositional control over the start and end of every clip. Combined with 41-second average generation times and a cost structure starting below $0.30 per clip, it is one of the most practical video models available in 2026. The best way to understand what Seedance 1.5 Pro can do for your specific creative needs is to try it. Create a free account on CreateVision AI, use the 80 daily free credits to generate your first clip, and experience the joint audio-visual output firsthand. When you are ready to scale, the Premium and Ultimate tiers—as well as standalone credit packs—make it easy to increase throughput without overcommitting your budget.
Start Creating with Seedance 1.5 Pro
Ready to experience joint audio-visual video generation? Click below to open the AI workspace with Seedance 1.5 Pro pre-selected and start creating immediately.
Start Creating with Seedance 1.5 ProFrequently Asked Questions
Is Seedance 1.5 Pro free to use?▼
Seedance 1.5 Pro is available on the free tier of CreateVision AI, which provides 80 credits per day. A short 480p clip without audio starts at 140 credits, so free-tier users can generate approximately one test clip every two days or accumulate credits over a few days for a longer 720p clip. Purchasing a credit pack from $30 is the fastest way to unlock more generation capacity without committing to a paid subscription.
How long can Seedance 1.5 Pro videos be?▼
Seedance 1.5 Pro supports any integer duration between 4 and 12 seconds. The default is 5 seconds when no duration is specified. Longer durations consume more credits—billing scales proportionally with the duration parameter you set—so choosing the shortest duration that meets your narrative needs is the most cost-effective approach.
Does Seedance 1.5 Pro support audio generation?▼
Yes. Audio generation is enabled by default in Seedance 1.5 Pro and is produced jointly with the video rather than added afterward. The model generates dialogue (with accurate lip-sync), environment sounds, and background music simultaneously with the visual content. To disable audio and produce a silent clip, set the generate_audio parameter to false when using the API, or toggle the audio option off in the CreateVision AI interface.
What languages does Seedance 1.5 Pro support for lip-sync?▼
Seedance 1.5 Pro supports accurate spoken-word lip-synchronization in eight languages: English, Mandarin Chinese, Japanese, Korean, Spanish, Portuguese, Indonesian, and Cantonese. Place dialogue inside double quotation marks within your prompt to improve the model's dialogue generation accuracy. Content in other languages may still be generated, but optimal lip-sync performance is guaranteed for these eight languages.
How does Seedance 1.5 Pro compare to Sora 2?▼
Sora 2 from OpenAI generates longer videos—up to 25 seconds versus Seedance's 12-second maximum—and excels at complex physics simulations. Seedance 1.5 Pro is faster (approximately 41 seconds per clip versus longer for Sora 2), more affordable per clip ($0.28–$0.65 versus Sora 2's higher cost), and provides native multilingual lip-sync across eight languages as a core architectural feature rather than an add-on. The right choice depends on your project: choose Sora 2 for duration and physics fidelity; choose Seedance 1.5 Pro for speed, cost efficiency, and synchronized multilingual dialogue.
Start creating AI videos with native audio sync — no waitlist, no setup. Select Seedance 1.5 Pro and generate your first clip in seconds.
