Is Seedance Open Source? ComfyUI & Access Explained
No — Seedance is a closed model with no downloadable weights. Here's what that means, how ComfyUI actually connects to it, and how to run it without a local GPU.
No — Seedance is not open source. It's a closed model delivered as an API and inside ByteDance's apps, much like OpenAI's Sora or Midjourney. There are no official model weights to download, and you can't run it locally. Here's what that actually means for you.
What "not open source" means here
- No public weights. ByteDance's Seed pages offer "Try Now" and "Get API" — there's no weights download, no Hugging Face checkpoint, no self-host option.
- No local inference. Unlike open-weight models (e.g. the Stable Diffusion / open video families), you can't put Seedance on your own GPU. Every generation runs on ByteDance's or a partner's servers.
- Access is via API or apps only — Dreamina/Jimeng, CapCut, or the API providers.
⚠️ Beware of fakes. Some GitHub repos titled things like "download Seedance weights" are API wrappers or SEO bait, not official weights. If a repo claims to give you the real Seedance model to run offline, it's almost certainly misrepresenting an API call.
So how does ComfyUI use Seedance?
This trips people up, because Seedance does show up in ComfyUI. The key point: those nodes call an API — they don't run the model locally.
- There's an official ComfyUI Partner Node for Seedance (added in early 2026). It sends your request to ByteDance's API, requires a login, and is billed per use.
- There are also third-party API-wrapper nodes (routing through BytePlus, muapi, and similar).
Either way, you still need an account and credits, and you still need to be online. "Run Seedance locally in ComfyUI" claims you'll see floating around are not accurate — there's no local model to run.
How to actually use Seedance
Since self-hosting isn't an option, your real choices are:
- Consumer apps — Dreamina/Jimeng or CapCut (see how to access Seedance 2.0).
- API — for developers, via the official endpoint or partners (see the Seedance API guide).
- No setup at all — start from a proven prompt and generate it on ponpon, which runs the Seedance line for you — no keys, no GPU, no install.
Closed-source doesn't mean hard to use — it just means you access Seedance through a service rather than downloading it.