Generate smooth video transitions with Seedance 2.5 First & Last Frame. Keyframe-driven motion at 720p, 30-second clips. Try free — pay per generation.
Seedance 2.5 First & Last Frame generates a smooth video transition between a start and end image, with selectable output resolution (480p/720p/1080p/4K) — price scales with the resolution chosen. Supports clips up to 30 seconds.
About this model
Seedance 2.5 First & Last Frame is the early-access keyframe-transition endpoint in the Seedance 2.5 family, generating a smooth video transition between a start image and an end image. It preserves the visual identity of both frames while filling in natural, cinematic motion between them, and supports clips up to 30 seconds, with selectable output resolution (480p/720p/1080p/4K) — price scales with the resolution chosen. This endpoint also supports Draft Mode: set draft: true for a fast, low-cost 480p preview (resolution is ignored — sending anything other than 480p alongside draft=true is rejected), then call this same endpoint again with draft_request_id set to that draft's request_id to finalize it at full 1080p, reusing the first and last frame images from the original draft automatically. A draft stays finalizable for 7 days after it completes.
Cost analysis
| Provider | Cost | Notes |
|---|---|---|
| muapiapp | $0.17–$1.70/sec (480p–4K) | Pay-per-generation pricing with no subscription. Price scales with the selected resolution (480p/720p/1080p/4K). |
| Fal.ai | $0.47/sec (720p) or $0.2205/sec (480p) | MuAPI is cheaper than Fal.ai across every resolution tier. |
| Replicate | Not available | Seedance 2.5 is not listed on Replicate. |
Pay-per-generation pricing with no subscription. Price scales with the selected resolution (480p/720p/1080p/4K).
MuAPI is cheaper than Fal.ai across every resolution tier.
Seedance 2.5 is not listed on Replicate.
** Competitor pricing is estimated based on similar model architectures and usage tiers.
Configuration schema
| Parameter | Type | Description | Default |
|---|---|---|---|
| Prompt | string | Text prompt describing the transition and motion. | Create a smooth transition from a cloudy sky to a quiet riverside park path, with natural camera movement and realistic lighting. |
| First and Last Frame Images | array | Exactly 2 images: [first_frame, last_frame]. | https://samplelib.com/jpeg/sample-clouds-400x300.jpg |
| Resolution | Enum (4 options) | Output resolution. Price scales with resolution: 480p is cheapest, 4K is most expensive. | 720p |
| Duration | int | The duration of the generated video in seconds. | 5 |
| Seed | int | Random seed for reproducible generation. Use -1 for random. | 42 |
| High Bitrate | boolean | Enable high bitrate mode for better visual fidelity. Produces larger files. | false |
| Draft | boolean | Generate a cheap 480p draft (resolution must be 480p or omitted when true — any other value is rejected). Finalize the draft you keep at 1080p by calling this same endpoint again with draft_request_id set to this request's request_id. | false |
| Draft Request ID | string | Finalize an earlier draft (submitted with draft=true) into a full 1080p render. Set to that draft's request_id; prompt, media, duration, aspect ratio and seed are reused from the draft. resolution must be 1080p or omitted, and draft must not be true — anything else is rejected. The draft must be completed and at most 7 days old. | - |
Text prompt describing the transition and motion.
Create a smooth transition from a cloudy sky to a quiet riverside park path, with natural camera movement and realistic lighting.Exactly 2 images: [first_frame, last_frame].
https://samplelib.com/jpeg/sample-clouds-400x300.jpgOutput resolution. Price scales with resolution: 480p is cheapest, 4K is most expensive.
720pThe duration of the generated video in seconds.
5Random seed for reproducible generation. Use -1 for random.
42Enable high bitrate mode for better visual fidelity. Produces larger files.
falseGenerate a cheap 480p draft (resolution must be 480p or omitted when true — any other value is rejected). Finalize the draft you keep at 1080p by calling this same endpoint again with draft_request_id set to this request's request_id.
falseFinalize an earlier draft (submitted with draft=true) into a full 1080p render. Set to that draft's request_id; prompt, media, duration, aspect ratio and seed are reused from the draft. resolution must be 1080p or omitted, and draft must not be true — anything else is rejected. The draft must be completed and at most 7 days old.
-Developer documentation
Choose Your Start and End Images
images_list: [first_frame, last_frame].Describe the Transition
prompt describing the motion and camera movement between frames.Configure Output
duration (4–30s), aspect_ratio, and optionally seed.Submit via the API
curl -X POST https://api.muapi.ai/api/v1/seedance-2.5-first-last-frame \
-H "x-api-key: YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"prompt": "Create a smooth transition from a cloudy sky to a quiet riverside park path.",
"images_list": ["https://example.com/start.jpg", "https://example.com/end.jpg"],
"duration": 8
}'
GET /api/v1/predictions/{request_id}/result until status is completed, then retrieve the video URL from output.Frequently asked
It generates a video transition between two supplied images — the first becomes the opening frame, the second the closing frame — with natural motion in between.
Exactly 2, in order: `[first_frame, last_frame]`, via the `images_list` field.
Four resolutions are available on a single endpoint via the `resolution` parameter: 480p, 720p (default), 1080p, and 4K. Price scales with the resolution chosen — see the pricing table below.
Between 4 and 30 seconds, configurable via the `duration` parameter.
Yes — pass an explicit `seed` value, or use -1 for a random seed each time.
Yes — set draft: true for a cheap 480p preview ($0.17/sec), then finalize the one you keep at 1080p by calling this same endpoint again with draft_request_id set to that draft's request_id, instead of a new prompt. See the [Draft Mode API guide](/seedance-2.5-draft-mode) for the full workflow.