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Usable 24 hours after sign-up, up to 5 runs per day and at most 2 credits per run. Other sign-in methods start without credits.
02
Examples
Real outputs from the public examples of this model on Replicate, with the prompt and settings that produced them. They were not generated live on this page.
Prompt
The sun rises slowly between tall buildings. [Ground-level follow shot] Bicycle tires roll over a dew-covered street at dawn. The cyclist passes through dappled light under a bridge as the entire city gradually wakes up.
Length: 0:05
Settings
aspect_ratio
16:9
resolution
1080p
duration
5
fps
24
Prompt
A skier glides over fresh snow, kicking up large clouds of snow as he turns. Accelerating gradually down the slope, the camera moves smoothly alongside.
Length: 0:05
Settings
aspect_ratio
16:9
resolution
1080p
duration
5
fps
24
Example prompts
Examples from the Railwail catalog. They were not generated live on this page.
Product
Length: 0:05
Smartphone rotating with reflections
03
About Seedance Pro
TL;DRAs of September 23, 2026
Seedance Pro is a model by ByteDance in the Video generation category. On Railwail, Seedance Pro costs $0.18 per second of video. Depending on the settings, the price ranges from $0.036/s to $0.18/s. A default run of 5 seconds costs $0.90. Supported aspect ratios: 16:9, 9:16, and 1:1. Possible lengths: 5 or 10 s.
Background
About ByteDance Seed
Founded 2023 · Beijing, China
ByteDance Seed is the foundation-model research arm of ByteDance, the company behind TikTok, Douyin and CapCut. Formed in 2023 and led by Wu Yonghui, Seed ships the Doubao consumer assistant, the Skylark / Doubao LLM family, the Seedream image model and the Seedance video model. Seedance launched in early 2025 with two tiers: Seedance Pro (high-fidelity) and Seedance Lite (fast). The Pro tier targets advertising, e-commerce and film-style use cases, with longer durations, higher resolution and richer cinematic controls than Lite. ByteDance also expose Seedance through the Doubao API, the CapCut Pro creator suite and selected enterprise integrations.
Diffusion Transformer (DiT) with 3D spatio-temporal VAE
Seedance Pro is a closed Diffusion Transformer operating on a 3D spatio-temporal Variational Autoencoder. The denoiser uses full 3D attention with bilingual text conditioning from ByteDance's Doubao / Skylark LLM family and optional image embeddings for first-frame, end-frame and subject-reference modes. The Pro tier is positioned for high-fidelity creative work and supports 5-10 second clips at 1080p / 24-30 fps with extension chains for longer sequences. Cinematic control vocabulary covers lens choice, camera moves and shot scale. Training uses a curated multilingual video corpus drawn in part from ByteDance's privileged access to TikTok / Douyin platform data, with synthetic dense bilingual captions and reward-model post-training tuned for aesthetic quality and prompt fidelity. Public independent benchmarks (Artificial Analysis, etc.) consistently rank Seedance Pro in the top tier of Chinese video models alongside Kling v3.
Parameters
Undisclosed
Capabilities
Text-to-video, image-to-video and subject-reference modes
5-10 second clips at 1080p / 24-30 fps natively
Extension chains for longer sequences
Rich cinematographic prompt vocabulary
Strong prompt adherence on complex compositions
Bilingual Chinese/English prompts
Available via Doubao API, CapCut Pro and enterprise integrations
Frequently top-ranked among Chinese video models in public leaderboards
Best for: ad creative, e-commerce, cinematic shorts, branded content.
Training & license
Closed multi-billion-clip corpus including licensed video, web video and ByteDance platform data with bilingual dense captions; exact size undisclosed.
License: Proprietary commercial licence via Doubao / ByteDance Seed terms; commercial use on paid plans.
Safety testing: NSFW, CSAM, public-figure and politically sensitive content filters per CAC algorithmic-content rules; stricter on Chinese surfaces.
Known limitations
5-10 second clip limit per generation
No native audio in current version
Heavy political and public-figure moderation in China
curl https://railwail.com/api/v1/videos/generations \
-H "Authorization: Bearer $RAILWAIL_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "seedance-pro",
"prompt": "A slow drone shot over a misty pine forest at sunrise"
}'
# Response: {"job_id": "...", "status": "queued", ...}
# Poll until status is completed, failed or cancelled:
curl https://railwail.com/api/v1/jobs/JOB_ID \
-H "Authorization: Bearer $RAILWAIL_API_KEY"
import os
import time
import requests
API = "https://railwail.com/api/v1"
headers = {"Authorization": f"Bearer {os.environ['RAILWAIL_API_KEY']}"}
job = requests.post(
f"{API}/videos/generations",
headers=headers,
json={
"model": "seedance-pro",
"prompt": "A slow drone shot over a misty pine forest at sunrise",
},
).json()
while True:
status = requests.get(f"{API}/jobs/{job['job_id']}", headers=headers).json()
if status["status"] in ("completed", "failed", "cancelled"):
break
time.sleep(5)
print(status["status"], status.get("output_url"))
const API = "https://railwail.com/api/v1";
const headers = {
Authorization: `Bearer ${process.env.RAILWAIL_API_KEY}`,
"Content-Type": "application/json",
};
const job = await fetch(`${API}/videos/generations`, {
method: "POST",
headers,
body: JSON.stringify({
model: "seedance-pro",
prompt: "A slow drone shot over a misty pine forest at sunrise"
}),
}).then((r) => r.json());
let status;
do {
await new Promise((r) => setTimeout(r, 5000));
status = await fetch(`${API}/jobs/${job.job_id}`, { headers }).then((r) => r.json());
} while (!["completed", "failed", "cancelled"].includes(status.status));
console.log(status.status, status.output_url);
Seedance Pro is a model by ByteDance in the Video generation category. On Railwail you can call it with an API key through the Railwail API.
How much does Seedance Pro cost on Railwail?
On Railwail, Seedance Pro costs $0.18 per second of video. Depending on the settings, the price ranges from $0.036/s to $0.18/s. A default run of 5 seconds costs $0.90. The price is known before the run starts. Usage is paid from prepaid credits; 1 credit equals $0.01.
Which settings does Seedance Pro support?
According to its input schema, Seedance Pro knows these parameters: prompt, duration (5 or 10), end_image, start_image, and aspect_ratio (16:9, 9:16, or 1:1).
How fast is Seedance Pro?
There are not enough measured runs of Seedance Pro on Railwail yet to state a run time. It depends on the input, the settings and the load at the provider.
Is Seedance Pro better than Google Veo 3.1?
That depends on the task. Seedance Pro (ByteDance) and Google Veo 3.1 (Google DeepMind) are both models in the Video generation category. The comparison page shows their prices and specifications side by side.
Create a Railwail API key and send your request with the model ID seedance-pro. Code examples for curl, Python and JavaScript are in the API section of this page.
