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Keny Alba
Keny Alba

Posted on Originally published at getscrollflow.com AI-assisted

Seedance 2.5 Goes 4K for 20 Studios: Verified Prices, Draft Mode Math, and Who Can Actually Use It

#ai #aivideo #performance #videogeneration

ByteDance just put a 4K label on its best video model, and the headlines wrote themselves. The more interesting story is quieter: who is actually allowed to use that 4K mode (almost nobody: around 20 studios, according to a single press report, relayed but not confirmed by ByteDance), what the public model really costs per generated second (we recalculated it from the official formula), and a billing mechanism called Draft mode that changes how studios iterate, without making any single video cheaper.

Everything below comes from official ByteDance, Volcano Engine and BytePlus documentation, cross-checked with dated press. We did not test the 4K model ourselves: access is enterprise-only, and we will not pretend otherwise.

What just shipped: Seedance 2.5 4K in enterprise trial

On October 23, 2026, Volcano Engine, ByteDance's cloud arm, officially presented Seedance 2.5 4K as the strongest model of its 2.5 generation, with extra training on facial expressions, micro-movements and fine image detail (Yicai, October 23).

The day before, Chinese tech outlet Leiphone reported that the first enterprise trial batch is deliberately tiny: around 20 studios and directors worldwide, tied to real big-screen productions (Leiphone, October 22). According to that report, 20 productions are underway, the first one, an S-tier satellite TV IP, could air as early as November, and a major global film IP is involved. One testing studio told Leiphone its costs came in "lower than expected", thanks to a 480p-first workflow. Keep in mind this "20 studios" figure traces back to that single report, even if other outlets (TMTPost, Beijing News) relayed the trial the same day.

Two things are certain. Access is invitation-only, with wider availability described as possible later, not promised. And no 4K price for Seedance 2.5 has been published anywhere.

One fact almost every headline missed: native 4K output is already on sale to the public, on the previous generation. Seedance 2.0 has a listed 4K tier on both Ark in China (25.27 CNY, about 3.8 USD, per 5-second clip) and BytePlus internationally (3.89 USD per 5-second clip, capped at 15 requests per minute and 1 concurrent job). What is new this week is not 4K itself. It is native 4K on the new 2.5 model, the one that generates audio and video jointly, runs up to 30 seconds and accepts up to 50 reference assets, with film productions in its sights, not 4K in the abstract.

What the model actually does

Seedance 2.5, the base model that went generally available in August, is described by ByteDance's Seed team as a "next-generation audio-video joint generation model" (seed.bytedance.com). Joint is the keyword: the model generates sound together with the picture, not as an afterthought.

From the official pages, verified on October 25-26:

  • Length: up to 30 seconds in a single generation, with the option to extend twice.
  • References: up to 50 reference assets in one run, 30 images, 10 videos and 10 audio files, according to the BytePlus model page. Seed says the model reads a reference video's intention, framing and cinematic language, "beyond motion transfer into creative interpretation".
  • Editing: localized in-video editing, white-model (clay-style mannequin) control, green-screen editing, and what Seed calls professional camera movement and blocking.
  • Languages: native support for 10+ languages (BytePlus).
  • Public output specs: 4 to 30 seconds, 480p, 720p or 1080p, at 24 FPS, MP4 or MOV (BytePlus).

That last line is the one to remember: publicly, Seedance 2.5 tops out at 1080p on both the Chinese and international platforms. The 4K tier exists only inside the enterprise trial.

Draft mode: the innovation that saves money, not the one that impresses

Buried in Volcano Engine's Ark pricing documentation is a mechanism called Draft mode, and it explains the trial studio's "lower than expected" comment better than any benchmark. Its exact wording, translated from Chinese:

"Seedance 2.5's Draft mode consists of two tasks, each billed separately"

Source: Volcano Engine's Ark pricing documentation, in Chinese, verified on October 27, 2026.

A Draft generation is billed as two separate tasks:

  1. Step 1: a draft video, billed at 480p rates.
  2. Step 2: the final video at the target resolution. The draft's own tokens do not count toward step 2, and the per-token rate is set by whether step 1 included an input video.

We verified the official token formula against Ark's own price examples, and it checks out to the cent: tokens = duration in seconds x width x height x FPS / 1024, at 24 FPS. A 5-second 1080p clip is 5 x 1920 x 1080 x 24 / 1024 = 243,000 tokens, which at 77 CNY per million tokens gives 18.71 CNY, exactly Ark's listed example.

Now the interesting comparison, for a 10-second 1080p shot without input video:

  • Direct generation: 486,000 tokens = 37.4 CNY (about 5.6 USD, indicative conversion at the October 27 rate of roughly 0.15 USD per CNY).
  • Draft path: step 1 at 480p costs 96,075 tokens = 6.7 CNY (about 1 USD), then step 2 costs the same 37.4 CNY as a direct run. Total: 44.1 CNY (about 6.6 USD).

Read that again, because it is the opposite of what "draft mode saves money" usually means. One finished video through the draft path costs more than one direct generation. What gets about 5.6 times cheaper is each iteration: 6.7 CNY per 480p attempt instead of 37.4 CNY per 1080p attempt. If you reject five drafts before approving one, that is six draft attempts plus the final render: 6 x 6.7 + 37.4 = 77.6 CNY (about 11.6 USD), instead of six direct 1080p tries at 6 x 37.4 = 224.4 CNY (about 33.7 USD). The draft is a cheap rehearsal, not a discount.

(One caveat: when your input already contains video, Ark applies a minimum token usage, so very short inputs do not shrink the bill below that floor.)

What a generated second really costs

Two official price lists exist, and they are not currency conversions of each other. Treat them as separate markets.

Volcano Ark, China (doubao-seedance-2.5, per million tokens, online inference):

Resolution No input video With input video
480p / 720p 70 CNY (approx. 10.5 USD) 42 CNY (approx. 6.3 USD)
1080p 77 CNY (approx. 11.6 USD) 46 CNY (approx. 6.9 USD)

Dollar amounts are indicative conversions at the October 27 rate (roughly 0.15 USD per CNY, CNY/USD quote observed on exa.ai). Ark bills in CNY; these are not dollar list prices.

Official worked examples, 5 seconds, 16:9: 3.36 CNY (0.50 USD) at 480p, 7.56 CNY (1.13 USD) at 720p, 18.71 CNY (2.80 USD) at 1080p. A 28% promotion on 1080p ran from August 14 to October 17 and has now ended.

BytePlus ModelArk, international (Dreamina-Seedance-2.5, per million tokens): 10.7 USD without input video, 6.4 USD with input video. The official example works out to 0.514 USD for a 5-second 480p clip. Seedance 2.0, the previous generation, carries the public native 4K tier at 3.89 USD per 5-second clip.

What that means in practice at international list prices: a 10-second 1080p shot costs about 5.20 USD in tokens, and a maximum-length 30-second generation about 15.60 USD. A rejected draft at 480p costs about 1.03 USD on the Chinese list, where Draft mode is documented; BytePlus's international docs do not describe Draft mode at the time of writing, so we will not claim it there. Per second, still at list price without input video: about 0.103 USD/s at 480p and 0.52 USD/s at 1080p (16:9, 24 fps).

Who can use it today, and who cannot

The 4K model: the trial studios, full stop. If a vendor offers you "Seedance 2.5 4K" access today, be careful: AIFilmHQ noted on October 23 that some resellers sell 1440p and 4K tiers that are upscales of 1080p output, not native generations (aifilmhq.com). That outlet also mentions 10-bit color for the 4K tier; we found no primary confirmation of that detail.

The public 1080p model, international: BytePlus ModelArk, ByteDance's international platform, sells Seedance 2.5 with a real entry ticket: activation requires at least 30 USD through one of three routes in the official activation doc:

Activation route Minimum Detail
Credits 30 USD prepaid top-up
Dedicated AI Savings Plan 30 USD 30, 60 or 100 USD tiers
Resource pack 30 USD valid for 90 days

There is no free quota for this model. On the consumer side, Dreamina (the international name for Jimeng, distributed with CapCut) offers Light and Production plans; those plans are explicitly non-refundable and fall back to pay-as-you-go when exhausted.

The public model in China: Volcano Ark for API access, Jimeng and Doubao for app usage.

Third parties: API resellers like OpenRouter carry Seedance models. The confusion is real enough that a Hacker News thread from August (news.ycombinator.com/item?id=49140823) opens with a user, r0fl, asking "Where can you use seedance to make movies? Do you have to sign up to a third party? [...] I just can't figure it out!!" The replies map the maze: Jimeng, Dreamina, Doubao, BytePlus, resellers. One reply notes there is no way to see subscription pricing without creating an account.

Reproduce the draft-to-final logic on your own footage

You do not need Seedance access to benefit from the draft idea: it is just resolution discipline. We ran the following on October 26 with ffmpeg 4.4.2 on a synthetic 30-second 1080p24 clip (26.7 MB), and the numbers below are the real outputs.

Extract one reference frame every 5 seconds, at 480p width, for storyboard validation:

ffmpeg -i master-1080p.mp4 -vf "fps=1/5,scale=854:-1" frames/%03d.jpg
Enter fullscreen mode Exit fullscreen mode

Result: 6 JPEG frames at 854x480, 25 to 39 KB each.

Render a 480p draft proxy for edit approval:

ffmpeg -i master-1080p.mp4 -vf scale=854:480 -c:v libx264 -crf 28 proxy-480p.mp4
Enter fullscreen mode Exit fullscreen mode

Result: 895 KB, about 3.4% of the master's size, same duration and frame rate.

One nuance worth keeping: the file shrank 30-fold, but a generation API does not bill file size, it bills pixels. A 480p frame holds 19.8% of the pixels of a 1080p frame, which is why a 480p draft costs roughly one fifth of the tokens, not one thirtieth. Whether you are validating an edit locally or iterating on a paid model, the habit is the same: approve the cheap version, pay for the expensive one once.

What this launch says about the video model race

The race of late 2026 is not resolution, it is sustained coherence. Kuaishou launched Kling 4.0 on October 15 (official press release) with native 30-second single-pass generations and an Omni Reference system handling up to 15 reference assets and 10 keyframes; API access for enterprise customers is announced as coming soon. ByteDance answers with 30-second joint audio-video generation, reference libraries of 50 assets, and an enterprise 4K tier aimed at theatrical productions, plus industrial uses like robotics simulation (Leiphone).

Notice where the differentiation happens: billing mechanics, reference control, editing. Draft mode is a procurement feature as much as a creative one. The studios in this trial are not testing whether AI video looks good. They are testing whether it fits a production budget and a post-production pipeline. That is a maturity signal for the whole category.

Limits and what we do not know yet

This article is documentation analysis, not a hands-on review. The 4K model is inaccessible to us, trial results have not been independently verified, and the "20 studios" figure rests on one report. No 4K price or general availability date has been published for Seedance 2.5. The 10-bit color detail comes from a single secondary source. BytePlus's international documentation does not describe Draft mode, so the draft math above is anchored to the Chinese Ark list. Prices and access rules can change at any time; every figure here carries its verification date.

Key takeaways

  • Seedance 2.5 4K is real but locked in an enterprise trial of about 20 studios. Public Seedance 2.5 tops out at 1080p; public native 4K already exists on the older Seedance 2.0.
  • The model generates audio and video jointly, runs up to 30 seconds (extendable twice), takes up to 50 reference assets, and edits footage locally.
  • Draft mode bills a 480p rehearsal plus the final render: each iteration costs about 5.6 times less, not the final video.
  • Verified costs: 5 seconds of 1080p = 18.71 CNY (about 2.8 USD) on Ark, 5.20 USD for 10 seconds of 1080p at BytePlus international list prices, 3.89 USD for 5 seconds of native 4K on Seedance 2.0.
  • International access starts at 30 USD on BytePlus ModelArk. Beware resellers advertising "4K Seedance 2.5": it may be upscaled 1080p.
  • The draft habit is free to copy: iterate at low resolution, render final once. Two ffmpeg commands above get you there on your own footage.

Sources

Official sources:

Press:

Community:

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