Open-source video model vs API: which to use for Wan-class video
Weights you run yourself, or a hosted video API? What the choice changes for cost, setup and limits, with Wan 3.0's per-second API price as the worked example.
Run an open-weights video model yourself when you need control of the model, the data path or the hardware; call a hosted API when you want to pay per clip and skip the GPUs. For Wan 3.0 the vendor pages I read describe API access: fal's Wan 3 page presents it as an API model, and Alibaba's guide documents it through Model Studio. Check Alibaba's own channels for any weights release before you plan around one.
Read 2026-09-29: fal's Wan 3 page and Alibaba Cloud's Wan3.0 guide. The Sume figures are from Video generation and its pricing code.
What does each route change?
| Question | Weights you run | Hosted API |
|---|---|---|
| Who pays for compute | You, by the GPU hour or purchase | You, per output second |
| Setup | Install, update and keep the stack running | One HTTPS request |
| Length and inputs | Whatever the released weights support | Per model: wan-3.0 is 2 to 30 s |
| Data path | Stays on your machines | Inputs go to the provider |
| Versions | You choose when to update | The provider's current model |
What does the API price look like for Wan 3.0?
fal lists $0.05, $0.10 and $0.20 per second at 480p, 720p and 1080p; Sume bills that × 1.25. Wan 3.0 pricing per second has the amounts, so you can compare them with your own GPU cost per generated second.
How do I compare fairly?
Count the cost of a finished clip, not a benchmark run: GPU time, failed and discarded takes, storage, and the hours to keep the stack current. Do the same sum for the API with the number of takes you actually keep.
Can I start with the API and move later?
Yes. A hosted API needs no commitment beyond the balance you spend, and POST /v1/videos on Sume takes a model id from one catalog, so you can measure your real volume first.
Sources
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