Can I render a Shorts season on Sume's Free plan?

Yes, but in waves. Sume's Free plan processes one paid generation job at a time and accepts at most 6 (a queue of 5 plus the running one); the next submit fails with 429 queue_full.

So a season of ten 30-second episodes, one job each, is two waves of at most six jobs, with a pause for the first wave to drain.

The numbers

Generation concurrency is plan-only and prepaid top-ups do not raise it. The default queue capacity is the larger of 3 and five times the concurrency limit. Concurrency is a dispatch limit, not a submit limit: extra valid jobs queue as long as capacity remains.

Counting jobs, not episodes, is what matters: a 60-second Wan episode is at least two jobs.

A wave plan

Submit up to six jobs, poll until some are terminal, then submit the next jobs. Use an idempotency key so a retry does not double-submit, and back off on 429. Balance is checked at submit: a shortfall is 402 insufficient_credits before provider work starts.

If you queue Format runs instead, the bulk route accepts 100 items but workspace concurrency still applies to the children; see the bulk post and the queue_full post.

• Count jobs: clips plus renders plus captions.
• Do the pilot at 480p to keep the pilot cheap.
• Move up a plan when waves become the bottleneck.

Pilot first, then the season

On the Free plan the cheapest honest plan is a pilot. Use 480p at $0.0625 per second of Wan 3.0, which makes a 30-second beat $1.88. Six accepted jobs at that tier cost $11.25 at most. Run them, look at the result, and only then decide about a larger plan.

Waves have a rhythm. Submit six, wait for the first to complete and then top the queue back up to six. This keeps the running job busy and never reaches the queue_full error. Because Free processes one job at a time, a six-job wave is six sequential renders, so schedule it when you are not waiting for it.

If the waves become the bottleneck, the table above shows the next step: Pro accepts 24 jobs and runs 4 at a time. Concurrency is plan-only, so a prepaid top-up does not raise it. Read the errors post for what to do when a submit is refused.

Plan the calendar too. A Free-plan wave of six 30-second Wan beats at 480p is six sequential renders, so run it overnight or while you write the next batch of prompts. When a wave finishes, record what it cost from the receipts, and use that real number, not the table, to size the next wave.