Video generation playground

Seedance 2.5 Flash API

ByteDance's fast Seedance 2.5 tier — 4–30s at 480p or 720p, with native audio, first/last frames and multimodal references. Early access.

Seedance 2.5 Flash is a video generation model from ByteDance, available on OttoPort's OpenAI-compatible API as the model ID seedance-2.5-flash at $0.30 / second as of 2026-11-14.

Provider

ByteDance

Price

$0.30 / second

Model ID

seedance-2.5-flash

Type

video generation model

Creative conceptsCampaign assetsDeveloper workflows

Create with Seedance 2.5 Flash

video

Video mode

Prompt

ExampleSelect to edit

Duration

Your result appears here

Start with the example prompt or make it your own. Your OttoPort account is used securely for generation.

Pricing

Seedance 2.5 Flash API pricing

What OttoPort bills for Seedance 2.5 Flash, and what that works out to per unit. Rates are read from the same catalog the gateway meters against, and were current on 2026-11-14.

Per second	$0.30
5-second clip	$1.50
8-second clip	$2.40
Seconds per $10	33	of generated video

No subscription and no minimum — OttoPort bills prepaid credits against usage. See the full rate card.

Quickstart

Call Seedance 2.5 Flash in three lines

Send "model": "seedance-2.5-flash" to POST https://ottoport.ai/api/v1/videos/generations with an OttoPort key. No ByteDance account, no waitlist, no separate SDK.

curl https://ottoport.ai/api/v1/videos/generations \
  -H "Authorization: Bearer $OTTOPORT_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "seedance-2.5-flash",
    "prompt": "cinematic product reveal, slow dolly, black background",
    "duration": 5,
    "aspect_ratio": "16:9"
  }'

import requests

job = requests.post(
    "https://ottoport.ai/api/v1/videos/generations",
    headers={"Authorization": "Bearer " + API_KEY},
    json={
        "model": "seedance-2.5-flash",
        "prompt": "cinematic product reveal, slow dolly, black background",
        "duration": 5,
        "aspect_ratio": "16:9",
    },
).json()

# Video is a job: poll it, or pass webhook_url and be told.
print(job["id"], job["status"])

const res = await fetch("https://ottoport.ai/api/v1/videos/generations", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${API_KEY}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    model: "seedance-2.5-flash",
    prompt: "cinematic product reveal, slow dolly, black background",
    duration: 5,
    aspect_ratio: "16:9",
  }),
});

// Video is a job: poll it, or pass webhook_url and be told.
const job = await res.json();
console.log(job.id, job.status);

Before you start

1. Create a key at /api-keys.
2. Top up credits — the smallest pack is $25.
3. Paste the request. It returns a job ID; poll it or pass a webhook_url.

Full reference at /docs, or drive it from an agent with the MCP server and CLI.

Reference

Request parameters

The body POST https://ottoport.ai/api/v1/videos/generations accepts for Seedance 2.5 Flash.

Field	Type	Required	Notes
model	string	Yes	Always seedance-2.5-flash for Seedance 2.5 Flash.
prompt	string	Yes	Subject, action, and camera movement.
duration	integer	No	4–30 whole seconds, default 5. This is the billed unit.
generate_audio	boolean	No	Generate synchronized audio, default true.
resolution	string	No	One of: 480p, 720p. Tiers above this model's base rate bill at a multiplier. Extend: 480p, 720p.
aspect_ratio	string	No	e.g. 16:9 or 9:16.
image_url	string	No	The first frame, for image-to-video.
last_frame_url	string	No	The closing frame. With image_url, this is first-and-last-frame generation.
reference_image_urls	array	No	Subjects the shot carries through — a character, a product — on models that accept references. Up to 10.
reference_video_urls	array	No	Reference videos — motion, a performance, a scene — the shot draws on. Billed per second of reference video on models whose upstream charges for it. Up to 5, 30s in all.
reference_audio_urls	array	No	Reference audio — a voice, a beat — beside reference images or videos. Reference fees depend on the model and mode. Up to 5, 30s in all.
video_url	string	No	An existing video to edit or extend. Source duration may count toward the price.
video_task	string	No	What to do with video_url: "edit" (the default) or "extend".
webhook_url	string	No	Called when the job settles, so you need not poll.
webhook_secret	string	No	Signs the webhook so you can verify it came from OttoPort.

Comparison

Seedance 2.5 Flash direct vs through OttoPort

Seedance 2.5 Flash is the same model either way — what changes is how many accounts, keys, and integrations you carry to reach it.

	ByteDance direct	Via OttoPort
Accounts and keys	A ByteDance account, plus one more for every other model you add	One OttoPort account and one key for the whole catalog
Request shape	ByteDance's own SDK and response format	OpenAI-compatible — point baseURL at OttoPort and change the model string
Switching models	A new integration per provider	Replace seedance-2.5-flash with any other model ID in the catalog
Billing	A separate invoice and contract per provider	Prepaid credits, no subscription, one usage ledger
Provider outages	Your call fails	Configured backup routes are tried in order on provider failure

Describe the subject and action.

Add a camera movement.

Specify your output format.

FAQ

Seedance 2.5 Flash API questions

Cost, keys, and model IDs for Seedance 2.5 Flash on OttoPort.

How much does the Seedance 2.5 Flash API cost?

On OttoPort, Seedance 2.5 Flash costs $0.30 / second as of 2026-11-14. For scale, 5-second clip: $1.50. Billing is prepaid usage with no subscription and no minimum, and the current rate is always published at ottoport.ai/pricing.

How do I get a Seedance 2.5 Flash API key?

You do not need a ByteDance key. Create an OttoPort account, generate a key at ottoport.ai/api-keys, and send it as "Authorization: Bearer <key>" to POST https://ottoport.ai/api/v1/videos/generations with "model": "seedance-2.5-flash". The same key reaches every other model in the catalog.

What is the model ID for Seedance 2.5 Flash?

The OttoPort model ID for Seedance 2.5 Flash is seedance-2.5-flash. Pass it as the model field on POST https://ottoport.ai/api/v1/videos/generations, or list it programmatically from GET https://ottoport.ai/api/v1/models.

Is Seedance 2.5 Flash generation synchronous?

No. POST https://ottoport.ai/api/v1/videos/generations returns a job ID immediately. Poll GET https://ottoport.ai/api/v1/videos/generations/{id} for status, or pass webhook_url and webhook_secret and OttoPort will call you when the job settles. You are billed per second of output, so a failed job costs nothing.

Do I need a ByteDance account to use Seedance 2.5 Flash?

No. OttoPort connects to ByteDance on your behalf, so one OttoPort account covers Seedance 2.5 Flash and every other model in the catalog — no per-provider contracts, keys, or invoices.

Alternatives