Seedance 1.5 Pro API
ByteDance Seedance 1.5 Pro — cinematic, live-action-leaning clips with strong prompt adherence, expressive motion, and stable aesthetics. 4-12s duration with Smart Duration, multiple aspect ratios, reproducible generation via seeds.
Standard and Fast tiers, with variants for text-to-video, image-to-video, and video-extend (4-12s extensions with built-in upscaling), plus an image-to-video-spicy variant for unlimited scalable content generation. Optional audio via the generate_audio parameter.
About the Seedance 1.5 Pro API
What Seedance 1.5 Pro does, how it fits in the ByteDance model lineup, and why teams reach for it.
Seedance 1.5 Pro is a video generation model from ByteDance, available through the WaveSpeedAI REST API. ByteDance Seedance 1.5 Pro — cinematic, live-action-leaning clips with strong prompt adherence, expressive motion, and stable aesthetics. 4-12s duration with Smart Duration, multiple aspect ratios, reproducible generation via seeds.
Standard and Fast tiers, with variants for text-to-video, image-to-video, and video-extend (4-12s extensions with built-in upscaling), plus an image-to-video-spicy variant for unlimited scalable content generation. Optional audio via the generate_audio parameter.
The Seedance 1.5 Pro family on WaveSpeedAI ships 7 REST endpoints covering Image-To-Video, Video-Extend, Text-To-Video workflows. Each variant carries its own pricing, parameter knobs, and example outputs — pick the one that matches your input modality and production constraints, or call several from the same API key to compose multi-step pipelines.
Run Seedance 1.5 Pro through the same API key, billing account, and rate-limit envelope you use for the other 1,000+ AI models on WaveSpeedAI. No separate vendor setup, no per-provider SDKs, no per-vendor rate-limit envelopes — one integration covers everything from text-to-image and text-to-video through audio synthesis, 3D generation, upscaling, and editing.
All Seedance 1.5 Pro API endpoints
7 endpoints available now on WaveSpeedAI — pick the variant that matches your workflow.
Image To Video Spicy
Seedance 1.5 Pro Spicy Image-to-Video generates unlimited high-quality cinematic clips from images, optimized for scalable content generation with smooth animations and stable aesthetics. Ready-to-use REST inference API, best performance, no coldstarts, affordable pricing.
Video Extend
Seedance 1.5 Pro Video-Extend turns short video clips into longer videos with natural motion continuation, stable aesthetics, and upscaled output. It supports 4–12s duration control, multiple aspect ratios/resolutions, and seed-reproducible results—ideal for extending ad creatives and short-drama shots. Built for stable production use with a ready-to-use REST API, no cold starts, and predictable pricing.
Video Extend Fast (Fast)
Seedance 1.5 Pro Fast Video Extend turns short shots into longer clips with natural motion continuation and strong temporal consistency. Supports 4–12 s extensions, 720p/1080p output with built-in upscaling, and seed-reproducible results for shot matching. Ideal for ads, trailers, and short-drama beats. Production-ready REST API with fast response, no cold starts, and affordable pricing.
Text To Video
Seedance 1.5 Pro (Text-to-Video) generates cinematic, live-action–leaning clips from text with strong prompt adherence, expressive motion, and stable aesthetics. It supports 4–12s duration control (including Smart Duration), multiple aspect ratios (including adaptive), and reproducible generation via seeds—ideal for ads and short-drama workflows.
Image To Video Fast (Fast)
Seedance 1.5 Pro Fast Image-to-Video transforms a single image (plus optional text prompt) into cinematic, live-action-leaning clips while preserving subject identity, composition, and first-frame fidelity. Built for stable production use with a ready-to-use REST API, no cold starts, and predictable pricing.
Text To Video Fast (Fast)
Seedance 1.5 Pro Fast (Text-to-Video) converts text prompts into cinematic, live-action-leaning videos with strong prompt adherence, expressive yet stable motion, and consistent aesthetics. It supports 4–12s duration control, multiple aspect ratios (9:16, 1:1, 16:9), and 720p/1080p output with seed-reproducible results—ideal for ads, trailers, and short-drama beats. Built for stable production use with a ready-to-use REST API, no cold starts, and predictable pricing.
Image To Video
Seedance 1.5 Pro Image-to-Video generates cinematic, live-action–leaning clips from a text prompt plus a first-frame image, preserving the image’s subject and composition while adding expressive motion and stable aesthetics. It supports 4–12s duration control (including Smart Duration), adaptive aspect ratio that follows the input image, and reproducible outputs via seeds—ideal for ad creatives and short-drama shots that need a strong visual anchor.
See Seedance 1.5 Pro in action
Real outputs generated by the Seedance 1.5 Pro API. Hover any video to preview, click to open the full-size viewer.
How to use the Seedance 1.5 Pro API
Four steps from signup to a finished generation. Full Python, Node.js, and cURL examples are in the API section below.
- 1
Get an API key
Sign up for a WaveSpeedAI account and copy your API key from the dashboard. New accounts come with free starter credits — enough to run the playground a few dozen times before billing kicks in.
- 2
Submit a prediction
POST your input as JSON to https://api.wavespeed.ai/api/v3/bytedance/seedance-v1.5-pro/text-to-video. The endpoint returns a prediction id immediately — generations are async so you don't hold an open connection during inference.
- 3
Poll for completion
GET https://api.wavespeed.ai/api/v3/predictions/{request_id}/result every 1-2 seconds. The response includes a status field; keep polling until it flips from"queued" or"processing" to"completed".
- 4
Read the output URL
Once status is"completed", read the URL from data.outputs[0]. The URL points to your generated media on the WaveSpeedAI CDN — image, video, audio, or 3D file depending on the Seedance 1.5 Pro variant you called.
What you can build with Seedance 1.5 Pro
Common workflows developers and creators use the Seedance 1.5 Pro API for.
Live-action-leaning short content
Catalog framing: "ideal for ads and short-drama workflows." The model trains heavily on live-action material, so realistic motion and photographic textures come more naturally than illustrated or animation styles.
Smart Duration (4-12 seconds)
Both text-to-video and image-to-video support 4-12s duration with Smart Duration mode that adapts length to content. Useful when you don't want to lock a duration up front and would rather let the model pick what fits the prompt.
Reproducible generation via seeds
Seed parameter is exposed — lock a seed to reproduce a generation exactly, then vary one prompt element at a time for cleaner A/B testing of creative variations. Useful for ad-creative iteration where you isolate one variable per test.
Video-extend for longer outputs
bytedance/seedance-v1.5-pro/video-extend turns short shots into longer clips with natural motion continuation, stable aesthetics, and built-in upscaling. Supports 4-12s extensions, 720p/1080p output. Fast tier (video-extend-fast) for high-volume extension work.
Spicy variant for scalable stylized content
bytedance/seedance-v1.5-pro/image-to-video-spicy is positioned by the catalog as "unlimited high-quality cinematic clips from images, optimized for scalable content generation" — pick when you need throughput-friendly stylized i2v rather than the standard Pro tier.
Fast tier for iteration
text-to-video-fast and image-to-video-fast, the right pick for prompt iteration, A/B testing, and high-volume content pipelines. Switch to Standard for delivery.
Tips for prompting Seedance 1.5 Pro
Practical advice for getting better outputs from Seedance 1.5 Pro — drawn from the patterns that work across video models in production pipelines.
Be specific about camera moves
Mention concrete cinematography vocabulary — orbit, dolly-in, push-in, pan-left, crane shot, handheld follow. Generic prompts produce static or arbitrary camera choices; named camera moves map directly to motion intent in the model's training data and dramatically improve shot quality.
Anchor character identity with reference images
If your prompt depends on a specific person, character, or product, upload a reference image alongside the prompt. Without a reference, identity drifts across frames and across shots — the same character ends up looking like a slightly different person each generation.
Describe lighting and time of day
Lighting cues like 'golden hour, soft warm directional light' or 'overcast diffused light, slate-grey sky' improve quality and consistency far more than vague quality modifiers. Lighting is one of the strongest priors the model conditions on.
Use negative prompts to suppress common failure modes
Useful negatives for video: 'frame flicker, motion blur, watermark, text artifacts, distorted hands, low resolution, jpeg compression'. Negative prompts cost nothing and noticeably reduce the rate of generations you'd otherwise re-roll.
Pick the shortest duration that captures your beat
Most prompts work best at 5-8 seconds. Longer clips amplify temporal inconsistencies (subject morphing, environment drift). If you need a 20-second sequence, generate three 6-8 second clips and edit them together — quality stays higher than one long generation.
Match aspect ratio to platform up front
9:16 for TikTok / Reels / Shorts, 16:9 for landscape feeds and YouTube, 1:1 for post grids. Models train slightly differently per aspect ratio — cropping a 16:9 to 9:16 after the fact loses both fidelity and the composition the model intended.
Seedance 1.5 Pro API pricing
Pricing is per-output. The final charge scales with the parameters you set in each variant's playground (resolution, duration, output count, references).
| Endpoint | Type | Starting price |
|---|---|---|
| bytedance/seedance-v1.5-pro/image-to-video-spicy | image-to-video | $0.26 |
| bytedance/seedance-v1.5-pro/video-extend | video-extend | $0.26 |
| bytedance/seedance-v1.5-pro/video-extend-fast | video-extend | $0.20 |
| bytedance/seedance-v1.5-pro/text-to-video | text-to-video | $0.26 |
| bytedance/seedance-v1.5-pro/image-to-video-fast | image-to-video | $0.20 |
| bytedance/seedance-v1.5-pro/text-to-video-fast | text-to-video | $0.20 |
| bytedance/seedance-v1.5-pro/image-to-video | image-to-video | $0.26 |
Call the Seedance 1.5 Pro API
Sign up for an API key at wavespeed.ai/accesskey, then submit a prediction via REST. The playground generates ready-to-paste samples for any combination of inputs.
HTTP example
# 1. Submit a prediction
curl -X POST "https://api.wavespeed.ai/api/v3/bytedance/seedance-v1.5-pro/text-to-video" \
-H "Content-Type: application/json" \
-H "Authorization: Bearer $WAVESPEED_API_KEY" \
-d '{}'
# 2. Poll the result until status = "completed"
curl -X GET "https://api.wavespeed.ai/api/v3/predictions/{request_id}/result" \
-H "Authorization: Bearer $WAVESPEED_API_KEY"
# Read the output URL from data.outputs[0].Node.js example
// npm install wavespeed
const WaveSpeed = require('wavespeed');
const client = new WaveSpeed(); // reads WAVESPEED_API_KEY
const result = await client.run("bytedance/seedance-v1.5-pro/text-to-video", {});
console.log(result.outputs[0]); // → URL of the generated outputPython example
# pip install wavespeed
import wavespeed
output = wavespeed.run(
"bytedance/seedance-v1.5-pro/text-to-video",
{}
)
print(output["outputs"][0]) # → URL of the generated outputSeedance 1.5 Pro vs alternatives
When to pick Seedance 1.5 Pro over similar models on WaveSpeedAI.
Seedance 1.5 Pro vs Seedance 2.0
Seedance 2.0 has Hollywood-grade output, the Turbo tier (1080p at near-480p speed), and native audio across every variant. Seedance 1.5 Pro is meaningfully cheaper, ships Smart Duration + reproducible seeds, and has a built-in video-extend endpoint with upscaling baked in.
Seedance 1.5 Pro vs Wan 2.7
Wan 2.7 ships reference-to-video, image-edit, and text-to-image variants in the same family — broader feature surface for cross-modal work. Seedance 1.5 Pro stays narrower (video-only) but adds Smart Duration and explicit seed-based reproducibility that Wan 2.7 doesn't expose.
Seedance 1.5 Pro vs Kling 3.0
Kling 3.0 has Pro and 4K tiers plus native audio. Seedance 1.5 Pro covers a different price point (-0.26), with Smart Duration, seeds, and a video-extend endpoint that Kling doesn't ship.
Seedance 1.5 Pro API — Frequently asked questions
Pricing, license, integration — common questions about running Seedance 1.5 Pro on WaveSpeedAI.
What is the Seedance 1.5 Pro API?
Seedance 1.5 Pro is a ByteDance video generation model exposed as a REST API on WaveSpeedAI. ByteDance Seedance 1.5 Pro — cinematic, live-action-leaning clips with strong prompt adherence, expressive motion, and stable aesthetics. 4-12s duration with Smart Duration, multiple aspect ratios, reproducible generation via seeds. You can call it programmatically or try it from the playground linked above.
How do I call the Seedance 1.5 Pro API?
Sign up for a WaveSpeedAI account, copy your API key from /accesskey, then POST to https://api.wavespeed.ai/api/v3/bytedance/seedance-v1.5-pro/text-to-video with your input as JSON. The endpoint returns a prediction id; poll the prediction endpoint until status flips to "completed", then read the output URL from data.outputs[0]. Full Python / Node.js / cURL examples are above.
How much does the Seedance 1.5 Pro API cost?
Seedance 1.5 Pro starts at $0.20 per run. The exact cost scales with the parameters you set (resolution, duration, output count, references). The live cost preview next to the Generate button in the playground shows the exact price for your current input.
Which Seedance 1.5 Pro variants are available?
WaveSpeedAI hosts 7 Seedance 1.5 Pro endpoints: bytedance/seedance-v1.5-pro/image-to-video-spicy, bytedance/seedance-v1.5-pro/video-extend, bytedance/seedance-v1.5-pro/video-extend-fast, bytedance/seedance-v1.5-pro/text-to-video, bytedance/seedance-v1.5-pro/image-to-video-fast, bytedance/seedance-v1.5-pro/text-to-video-fast, bytedance/seedance-v1.5-pro/image-to-video. Each variant has its own playground page and pricing.
Can I use Seedance 1.5 Pro outputs commercially?
Commercial usage rights follow the ByteDance model license. Most ByteDance models permit commercial output use; see each model's playground page for the specific license summary, and WaveSpeedAI's Terms of Service for platform-level conditions.
Why use Seedance 1.5 Pro on WaveSpeedAI instead of going direct?
One API key + one billing account across Seedance 1.5 Pro AND 1,000+ other AI models from other providers. No per-vendor SDK setup, no separate rate-limit envelopes, no rewrite-per-vendor integration code. Pricing is typically at parity with or below ByteDance's direct API.
About ByteDance
The team behind Seedance 1.5 Pro and the broader ByteDance model lineup on WaveSpeedAI.
ByteDance — the company behind TikTok, CapCut, and Doubao — runs one of the largest AI research operations in the world. Its Seed and Doubao teams ship state-of-the-art models for video generation (Seedance), image generation and editing (Seedream, Nano Banana), and avatar / lip-sync work. Models are trained on internal-scale data and shipped to production through ByteDance's consumer apps before being released as APIs.
Start building with Seedance 1.5 Pro on WaveSpeedAI
Free starter credits on signup. One API key across 1,000+ AI models from ByteDance and every other provider.