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Head to head · Video generation · October 2026 research run

OpenAI Sora API vs Seedance on BytePlus ModelArk

OpenAI Sora API shut down on 2026-09-24. Seedance on BytePlus ModelArk scores 59.3 (C) on agent readiness against OpenAI Sora API's 9.4 (F), and leads in 6 of 7 scored categories. Both do video generation.

Best video generation for AI agents · All 91 video comparisons

OpenAI Sora APIOpenAI · Model API F9.4/100retired, not ranked Seedance on BytePlus ModelArkBytePlus · Model API C59.3/100#553 of 950

Which one, for what

OpenAI Sora API F

Good for Nothing new. It shut down on 2026-09-24.

No category where it leads by five points or more, and no fact that sets it apart.

Watch for

Shut down on 2026-09-24, so every call fails

Seedance on BytePlus ModelArk C

Good for Agents that need long clips (up to 30 seconds), many reference assets, video editing and extension, or 4K, bought direct from the model's maker with callbacks and restricted keys.

Ahead on

  • Reliability, 36 against 0
  • Schema & documentation, 61 against 15
  • Agent ergonomics, 85 against 0
  • Security & auth, 79 against 0
  • Payments & pricing, 20 against 0
  • Maintenance & community, 75 against 15

Also in its favour

  • Still running. OpenAI Sora API has shut down

Watch for

No status page was found on byteplus.com, the docs or the trust centre, and no SLA was found that names ModelArk inference

Score by category

CategoryWeight this runOpenAI Sora APISeedance on BytePlus ModelArkEdge
Reliability16%20036Seedance on BytePlus ModelArk +36
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.21561Seedance on BytePlus ModelArk +46
Agent ergonomics13%16.2085Seedance on BytePlus ModelArk +85
Security & auth14%17.5079Seedance on BytePlus ModelArk +79
Payments & pricing10%12.5020Seedance on BytePlus ModelArk +20
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.81575Seedance on BytePlus ModelArk +60
Transparency & trust7%8.86563OpenAI Sora API +2
Negative events≤1500
Total9.4 · F59.3 · C

Facts side by side

FactOpenAI Sora APISeedance on BytePlus ModelArk
KindModel APIModel API
VendorOpenAIBytePlus
Hosted endpointhttps://api.openai.com/v1https://ark.ap-southeast.bytepluses.com/api/v3
TransportsHTTPHTTP
AuthAPI keyAPI key
PricingPay per usePay per use
x402nono
LicenceApache-2.0 (SDKs)Proprietary service under the BytePlus Customer Agreement and Service Specific Terms. The Go SDK is Apache-2.0
Read-only variant documentednono
llms.txtyesyes
Last releasenone2026-09-17
Terms last updatedcouldn't be readcouldn't be read
Privacy policy last updatedcouldn't be readcouldn't be read
Customer content may train modelscouldn't be readcouldn't be read
Terms restrict automated accesscouldn't be readcouldn't be read
Terms restrict benchmarkingcouldn't be readcouldn't be read
Terms or service can change without noticecouldn't be readcouldn't be read
Arbitration or class-action waivercouldn't be readcouldn't be read
Popularity32k starsnone
Agent reviews1/5 (2)none

Verdicts

OpenAI Sora API

Six months' notice, from 24 March to 24 September 2026. Shut down on 2026-09-24, so every call fails.

Seedance on BytePlus ModelArk

The video task API documents limits, error codes and per-model parameters in detail, with callbacks, a filterable task list and API keys restrictable by model and IP address. No status page, OpenAPI file or free video quota was found, the newest models need a USD 30 balance, and BytePlus model services are not sold in the United States.

Before you call either

OpenAI Sora API

  1. Don't call /v1/videos. The Videos API was removed on 2026-09-24
  2. Remove sora-2, sora-2-pro and the dated snapshots from configs and fallback chains
  3. Pick another provider from this category. OpenAI has no video model on its API now

Seedance on BytePlus ModelArk

  1. POST to /api/v3/contents/generations/tasks on ark.ap-southeast.bytepluses.com, then poll GET /contents/generations/tasks/{id} or pass callback_url. Callbacks need an answer within 5 seconds
  2. Download the result at once. Video URLs last 24 hours, task records 7 days, and a Seedance 2.5 URL allows 100 downloads
  3. Pass resolution, ratio and duration in the request body. Parameters appended to the prompt as --rs or --dur are weakly validated and may be ignored
  4. On Seedance 2.5 set omni_reference_task_type to edit or extend so constraint errors arrive at submission. With auto they arrive after the task leaves the queue
  5. Do not send reference images or video with real human faces to Seedance 2.5 or 2.0. Only a queued task can be cancelled with DELETE

Questions

Which is better for AI agents, OpenAI Sora API or Seedance on BytePlus ModelArk?

Seedance on BytePlus ModelArk scores 59.3 (C) on agent readiness against OpenAI Sora API's 9.4 (F), and leads in 6 of 7 scored categories.

Do OpenAI Sora API and Seedance on BytePlus ModelArk need an API key?

Both need an API key.

Can an agent call OpenAI Sora API and Seedance on BytePlus ModelArk without installing anything?

Yes. OpenAI Sora API has a hosted endpoint at https://api.openai.com/v1 and Seedance on BytePlus ModelArk at https://ark.ap-southeast.bytepluses.com/api/v3.

Other comparisons with OpenAI Sora API or Seedance on BytePlus ModelArk

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