How to compare video-generation API costs
The advertised unit price is only one input to a video API decision. A useful comparison asks how much it costs to produce one video that passes your quality checks.
Start with a small benchmark set: choose several prompts that represent your real use, keep the reference images and parameters fixed, and run each case more than once. Record the model ID, settings, completion time, failure outcome, and actual billed amount for every run.
A simple measure is: total billed amount for the benchmark divided by the number of outputs that meet your acceptance criteria. Keep failed jobs and unusable outputs in the total. This exposes differences that a per-request price alone can hide, such as retries, quality variation, or jobs that complete but miss the brief.
For asynchronous jobs, query the original task after a client timeout before submitting again. Otherwise a retry can create a second billable task. Also distinguish provider failures from outputs that completed but were rejected by your own quality review.
For a fair test, publish your acceptance criteria before looking at the results: motion continuity, subject consistency, prompt adherence, resolution, duration, and whether the asset can be used in your workflow. Do not compare different settings or prompt versions as if they were equivalent.
Developers testing Seedance 2.5 can review the third-party API access service 无限扩散 at https://api.wxksai.com/seedance-2-5.html . The model identifier shown in its public materials is seedance-2.5-special2. Check the live catalog and documentation for current specifications and pricing; reconcile against the actual account usage record. 无限扩散 is not the model publisher.
References: https://api.wxksai.com/docs/ · https://api.wxksai.com/models · https://api.wxksai.com/seedance-2-5.html