SeeDance 1.5 Pro
What is SeeDance 1.5 Pro?
SeeDance 1.5 Pro is the mid-range upgrade in ByteDance's first-generation SeeDance video line. It builds on SeeDance 1.0 Pro with two changes: 1080p output for web-quality delivery, and a 12-second duration option for clips that need to breathe past the previous 10-second cap. Two modes are exposed on Unifically: text-to-video with full aspect-ratio control, and first-and-last-frame interpolation that takes a required start frame and an optional end frame. Video only, no audio.
Key features of SeeDance 1.5 Pro
Four features cover the surface area you'll actually use day to day.
5, 10, or 12 second clips
The 12-second option is the duration upgrade over 1.0 Pro. Useful for ads with a setup-beat-payoff structure that does not fit in 10 seconds.
720p or 1080p output
1080p is the resolution upgrade over 1.0 Pro. Run cheaper 720p drafts during iteration, then re-run the keepers at 1080p for delivery.
First-and-last-frame mode
Hand the model a start frame and, if you want, an end frame. The model interpolates the camera move and motion between them while keeping aspect ratio from the input.
Six aspect ratios in text-to-video
21:9, 16:9, 4:3, 1:1, 3:4, and 9:16 cover cinematic, landscape, square, vertical, and tall mobile in one model.
Best for
Premium social content
1080p single-shot video for paid ads and homepage hero clips. A clear quality bump over 1.0 Pro at a similar parameter surface.
12-second arc ads
The extra two seconds matter for narrative pacing. Useful for ads that need setup, beat, and payoff in one cut.
First-and-last-frame hero shots
The same controlled interpolation mode as 1.0 Pro, now at 1080p. Useful for product reveals and brand transitions.
Format A/B testing
Run the same prompt at 720p and 1080p to see whether the resolution upgrade matters for your channel.
Single-shot brand work
Use it when the spot is one continuous take and you want quality without jumping to SeeDance 2.0.
Use cases
Build a 12-second arc ad that opens on the hero shot, holds for a beat in the middle, and lands on the product. Lock the closing image with first-and-last-frame mode. Generate a 1080p paid-ad cut and a 9:16 social cut from the same prompt by changing the aspect ratio. Storyboard a product reveal by giving the model the SKU shot as the start frame and the packaged shot as the end frame. Once a draft lands, lock it with a seed before re-rendering at 1080p for delivery.
API examples
Call SeeDance 1.5 Pro from any language by POSTing to /v1/tasks. Full parameter docs live at docs.unifically.com/models/video/bytedance/seedance-1.5-pro.
curl -X POST https://api.unifically.com/v1/tasks \
-H "Content-Type: application/json" \
-H "Authorization: Bearer YOUR_API_KEY" \
-d '{
"model": "bytedance/seedance-1.5-pro",
"input": {
"prompt": "A dancer performing an elegant routine on a moonlit stage",
"mode": "text_to_video",
"aspect_ratio": "9:16",
"duration": 10,
"resolution": "1080p"
}
}'
Successful submission returns a task_id. Poll GET /v1/tasks/<task_id> or set a callback_url on the request to receive the finished result.
FAQs
People also ask
SeeDance 1.5 Pro is the mid-range model in ByteDance's first-generation SeeDance video line. It supports text-to-video and first-and-last-frame modes at 720p or 1080p, with 5, 10, or 12 second clips. Single-shot output, video only.
Two upgrades. 1080p output is now an option (1.0 Pro caps at 720p). Duration extends to 12 seconds (1.0 Pro maxes at 10). Same six aspect ratios in text-to-video and the same first-and-last-frame interpolation mode.
No. SeeDance 1.5 Pro is video only. Add audio in post, or use SeeDance 2.0 if you need a synchronized audio track in the same call.
21:9, 16:9, 4:3, 1:1, 3:4, and 9:16 in text-to-video. First-and-last-frame mode uses the input image aspect ratio.
5, 10, or 12 seconds. The 12-second option is the main duration upgrade over 1.0 Pro.
Yes. Pass an integer seed alongside the prompt and any input frames. Re-sending the same prompt and seed returns the same render. Useful for A/B variants and regression checks.
