30-Second AI Video Generator: The Longest Single Clip on VdoBloom

Most AI video models cap one generation somewhere between 5 and 15 seconds, which is why almost every "long" AI video you have seen is really several short ones glued together. On VdoBloom exactly one model breaks that ceiling in a single render: ByteDance Seedance 2.5, which goes to 30 seconds. The next longest single generation on the platform is 16 seconds, on Vidu Q3 and Vidu Q3 Turbo. Seedance 2, Kling 3.0, Kling V3 Turbo and the Wan family all stop at 15.

Getting to it is straightforward. Seedance 2.5 sits in the model list in Text to Video, in Image to Video and on the Seedance Effects tab, so you can drive it from a prompt you write, from a photo you upload, or from a curated preset that brings its own prompt. Text to Video is the usual route when the 30 seconds is the point: you write the brief, Seedance 2.5 accepts up to 30,000 characters of it, and the duration grid exposes every whole second from 4 to 30.

The honest part is the price. Thirty seconds costs 276 credits at 480p and 600 credits at 720p, billed linearly at 9.2 and 20.0 credits per second. That is the most expensive single clip you can configure on this model, and the 10 free credits a new account starts with do not cover even the cheapest 4-second 2.5 render at 37 credits. Thirty seconds is a decision, not a default — test the look at 4 to 6 seconds, then buy the length once.

Open Text to Video

What this tool does

  • ByteDance Seedance 2.5 is the only model on VdoBloom that renders 30 seconds in a single generation. The next longest single generation is 16 seconds (Vidu Q3 and Vidu Q3 Turbo); Seedance 2, Kling 3.0, Kling V3 Turbo and Wan all stop at 15 seconds.
  • Duration on Seedance 2.5 is selectable at every whole second from 4 to 30 — 27 options, not a fixed 5/10/15 ladder. You can buy 23 seconds if the action is 23 seconds long.
  • A 30-second Seedance 2.5 render costs 276 credits at 480p and 600 credits at 720p.
  • Seedance 2.5 bills linearly at 9.2 credits per second at 480p and 20.0 at 720p: 4s = 37 or 80, 5s = 46 or 100, 10s = 92 or 200, 15s = 138 or 300, 30s = 276 or 600.
  • Seedance 2.5 tops out at 720p — there is no 1080p or 4K option. Seedance 2 is the family member that reaches 4K, and it stops at 15 seconds (a 15-second 4K Seedance 2 render is 1,240 credits).
  • Seedance 2.5 is selectable in three tabs — Text to Video, Image to Video and Seedance Effects — so a 30-second clip can start from a written prompt, from an uploaded photo, or from a curated preset.
  • In Text to Video the prompt is yours, up to 30,000 characters on Seedance 2.5 against 20,000 on Seedance 2 — enough to script beat by beat across a full 30 seconds.
  • Native audio is produced in the same pass. generate_audio is sent as true on every Seedance 2.5 render and there is no audio surcharge — the per-second rate is the same with sound or without.
  • Aspect ratios in Text to Video and Image to Video: 16:9, 4:3, 1:1, 3:4, 9:16 and 21:9. The Seedance Effects tab adds a seventh, adaptive.
  • The 10 free credits a new account receives will not cover any Seedance 2.5 render — the cheapest configuration, 4 seconds at 480p, is 37 credits. Credits are deducted when the job is submitted and refunded automatically if the render fails.

How it works

  1. 1.Open the tab that matches your starting point

    Text to Video at /dashboard/video-creation/text-to-video/ if the 30 seconds exists as a written idea. Image to Video at /dashboard/video-creation/image-to-video/ if it starts from a photo. Seedance Effects at /dashboard/video-creation/seedance-effects/ if you would rather apply a curated preset than write a brief — that catalogue is managed centrally and changes, so browse what is live rather than searching for a specific name.

  2. 2.Select Seedance 2.5 — nothing defaults to it

    Text to Video opens on Runway Gen-3 and Seedance Effects opens on Seedance 2, neither of which goes past 15 seconds. Pick Seedance 2.5 from the Seedance group in the model list and two controls change immediately: the duration grid expands to every second from 4 to 30, and the resolution list narrows to 480p and 720p.

  3. 3.Write a brief that has 30 seconds of content in it

    A one-line prompt gives a long render nothing to do, and the result idles or loops. Seedance 2.5 accepts up to 30,000 characters, so describe the shot in beats: what happens in the opening seconds, what changes at the midpoint, how the action resolves. On the Effects tab the effect supplies this instead, so choose one whose action has somewhere to go over half a minute.

  4. 4.Set the duration to the length of the action

    The duration control exposes every second from 4 to 30. Because billing is strictly per second, there is no rounding penalty and no reason to pick 30 when the motion resolves at 18 — 18 seconds at 480p is 166 credits against 276. Run your first attempt at 4 to 6 seconds (37 to 55 credits at 480p) purely to confirm the idea reads the way you expect.

  5. 5.Choose 480p or 720p and check the cost before generating

    Resolution is the biggest lever on this model: 720p costs roughly 2.2 times what 480p costs for the identical clip, 600 against 276 at 30 seconds. Draft at 480p, approve the motion, then spend once at 720p. The balance check runs before the job starts, so an underfunded 30-second attempt is refused rather than half-charged, and a render that fails downstream is refunded.

Frequently asked questions

What is the longest AI video I can generate as one clip?

Thirty seconds, on ByteDance Seedance 2.5. That is the platform maximum for a single generation and it is enforced server-side. You can reach it from Text to Video, Image to Video or the Seedance Effects tab. The next longest single generation available is 16 seconds on Vidu Q3 and Vidu Q3 Turbo; Seedance 2, Kling 3.0, Kling V3 Turbo and the Wan family stop at 15 seconds.

How much does a 30-second AI video cost on VdoBloom?

276 credits at 480p and 600 credits at 720p. Seedance 2.5 bills linearly at 9.2 credits per second at 480p and 20.0 at 720p, with no minimum-charge step and no surcharge for the audio it generates alongside the picture. Shorter durations scale exactly: 10 seconds is 92 or 200 credits, 15 seconds is 138 or 300.

Can I get a 30-second clip at 1080p or 4K?

No. Seedance 2.5 offers 480p and 720p only. The 4K path in the Seedance family is Seedance 2, which caps at 15 seconds and costs 1,240 credits for a 15-second 4K render. If you need a long clip at a higher delivery resolution, generate 30 seconds at 720p and upscale afterwards rather than looking for a 30-second 4K generation that does not exist.

Do I write a prompt for the 30-second clip?

In Text to Video and Image to Video, yes — the prompt box is yours and Seedance 2.5 accepts up to 30,000 characters, which is the right amount of room for a shot that has to fill half a minute. On the Seedance Effects tab, no: each effect carries its own prompt, written and maintained centrally, and you supply the photos. Either way you keep control of the model, the duration from 4 to 30 seconds, the resolution and the aspect ratio.

Does the 30-second clip have sound?

Yes. Seedance 2.5 generates native audio in the same pass as the video, and VdoBloom requests it on every render. Because pricing is linear per second either way, a 30-second clip with sound costs the same 276 or 600 credits as one without — there is no audio line item to add.

Can I try 30 seconds with my free signup credits?

No. A new account starts with 10 credits and the cheapest possible Seedance 2.5 render is 37 credits for 4 seconds at 480p. A 30-second render at 480p is 276 credits, roughly 28 times the free balance. If you want to see the model behave before committing, budget for a short 480p test first.

When is 30 seconds actually worth 276 or 600 credits?

When the shot must not cut — one continuous camera move, one unbroken performance, one product handled start to finish. For anything that cuts anyway, several shorter renders on a cheaper model deliver the same runtime for far fewer credits. Treat 30 seconds as a continuity purchase, not a length purchase.

Related tools

Long AI Video Generator: One 30-Second Take Instead of Six Stitched Clips

One 30-second Seedance 2.5 take costs 276 credits at 480p — exactly what six stitched 5-second renders cost, without the drift between them.

Seedance 2.5: the 30-second model, and how to run it

ByteDance Seedance 2.5 renders 4-30 seconds at 480p or 720p only. Pick it in Text to Video, Image to Video or Effects. 30s at 480p is 276 credits.

Seedance 2.5 price: the full credit table, per second and per clip

Seedance 2.5 costs 9.2 credits/sec at 480p and 20 at 720p. Cheapest render is 37 credits (4s, 480p); a full 30s at 720p is 600 credits.

Seedance 2.5 vs Seedance 2: duration against resolution

Seedance 2.5 runs 30s but caps at 720p; Seedance 2 stops at 15s and reaches 4K. 15s at 720p costs 300 vs 244 credits. The full maths.

Seedance 2.5 Audio: Sound Generated in the Same Pass, at No Surcharge

Seedance 2.5 generates audio in the same pass with generate_audio on by default, and charges nothing extra: 20 credits per second at 720p either way.

Cheapest AI video model on VdoBloom, measured in credits per second

Seedance 1.5 Pro bills 0.75 credits/sec at 480p and 1.5 at 720p — the lowest rate on VdoBloom. Full credits-per-second table by model.

Ready to try it?

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