Seedance 2.5 Flash API

Here is the straight answer: the Seedance 2.5 Flash API is priced but not open yet. ByteDance sells Seedance to developers through BytePlus ModelArk, and on November 12, 2026 ModelArk's price list added Flash, with its model ID, dreamina-seedance-2-5-flash-261115, at $7.00 per million tokens. The API itself still answers that the model doesn't exist. Build on Seedance 2.5 today, keep the model ID in one setting, and switching to Flash is a one-line change.

Two ways to call Seedance from code

• BytePlus ModelArk, ByteDance's own API. You need a BytePlus account and API key, and you pay BytePlus per token.
• The Lumeta API, one key for Seedance and every other top image, video and audio model, paid in Lumeta credits. Lumeta is the cheapest place to run Seedance 2.5 (details at lumeta.ai/pricing#seedance), and it also works from Claude, ChatGPT and other AI assistants through its MCP server.

Seedance on BytePlus ModelArk

A Seedance video is a task: you create it, then check on it until the video is ready. This is the shape of a text-to-video request for Seedance 2.5. When Flash opens, change SEEDANCE_MODEL and nothing else (Flash stops at 720p, so keep resolution at 480p or 720p).

export ARK_API_KEY=your-byteplus-key
export SEEDANCE_MODEL=dreamina-seedance-2-5-260628   # Flash: dreamina-seedance-2-5-flash-261115, once ModelArk accepts it

curl https://ark.ap-southeast.bytepluses.com/api/v3/contents/generations/tasks \
  -H "Authorization: Bearer $ARK_API_KEY" -H "Content-Type: application/json" \
  -d '{
    "model": "'"$SEEDANCE_MODEL"'",
    "content": [{"type": "text", "text": "A courier in a yellow rain jacket cycles through a neon-lit street at night, slow push in."}],
    "resolution": "720p",
    "ratio": "16:9",
    "duration": 5,
    "generate_audio": true
  }'
# returns {"id": "cgt-..."}; then GET .../contents/generations/tasks/cgt-... until status is "succeeded"

Reference images, videos and audio go in the same content list as image_url, video_url and audio_url items. Seedance 2.5 takes up to 30 images, 10 videos and 10 audio clips; Flash takes up to 10 images, 5 videos and 5 audio clips, in clips up to 30 seconds. Check BytePlus's ModelArk documentation for your region's endpoint and the current limits.

Seedance on the Lumeta API

One key, plain JSON, and a free cost estimate before you spend anything. Pick the engine in input:

export LUMETA_API_KEY=lm_live_...

# 1. What will it cost? (free)
curl https://api.lumeta.ai/v1/estimate \
  -H "Authorization: Bearer $LUMETA_API_KEY" -H "Content-Type: application/json" \
  -d '{"model": "seedance", "input": {"engine": "2.5", "prompt": "A courier cycles through a neon-lit street at night", "resolution": "720p", "duration": 5}}'

# 2. Make it
curl https://api.lumeta.ai/v1/generations \
  -H "Authorization: Bearer $LUMETA_API_KEY" -H "Content-Type: application/json" \
  -d '{"model": "seedance", "input": {"engine": "2.5", "prompt": "A courier cycles through a neon-lit street at night", "resolution": "720p", "duration": 5}}'

# 3. Wait for the video (use the id from step 2)
curl "https://api.lumeta.ai/v1/generations/gen_123?wait=45" -H "Authorization: Bearer $LUMETA_API_KEY"

Python, Node, webhooks and the full reference: Lumeta API docs. Flash will be added to the Lumeta API the day ByteDance releases it.

How to spot Flash the moment it lands

1. Keep the model ID in one setting, like SEEDANCE_MODEL above, never hard-coded in several places.
2. Test the ID for free. Send a create request with dreamina-seedance-2-5-flash-261115 and a 1-second duration, which every Seedance model refuses before making a video, so it costs nothing. An answer that the model does not exist means Flash isn't open to you yet; a complaint about the duration means it is. Watch ModelArk's model list in your BytePlus console too.
3. Or check this page. We post the day it opens here, with measured run times and the limits.

Seedance API pricing

ModelArk bills Seedance by tokens. A clip's tokens are roughly its width times height times frames, divided by 1,024, so a 5-second 720p clip is about 109,000 tokens. At BytePlus's list prices that is about $1.17 for Seedance 2.5, and $0.76 for both Seedance 2.5 Flash and Seedance 2.0, which share a price: $7.00 per million tokens, or $4.30 when the request includes a video. On Lumeta the same Seedance 2.5 clip is $0.73. See the pricing page for every resolution.

API questions

Sources: BytePlus ModelArk (model IDs and request format, as used in production on Lumeta), ModelArk's price list (Flash's ID and price), BytePlus's Seedance 2.5 announcement, Dreamina's Seedance 2.5 Flash page. Launch timing is our estimate.