AI Video Model Comparison: Seedance 2.5 vs Grok Imagine vs Veo 3.1 — Pricing and Use Cases (2026)

On August 7, 2026, ByteDance opened the developer API for Seedance 2.5 — the same day, as it happens, that xAI shipped Grok Imagine Image 2.0. A busy week for anyone choosing generation models. The image side is mapped in our AI image model comparison; this article does the same for video generation models: pricing and per-job fit, anchored on Seedance.

There's a second reason this sorting is urgent right now: OpenAI's Sora 2 API is scheduled to shut down on September 24, 2026. If your pipeline assumed Sora, this summer is your deadline for picking a replacement.

How this comparison is grounded: to be upfront — Adpicto does not run an AI video generation model in production (our video feature composes generated images into slideshows with TTS narration and subtitles; no video model involved). Everything in this article about video models is therefore a synthesis of official announcements, official pricing pages, and public leaderboards — no in-house quality benchmarks. What we do bring is the selection criteria learned from running image generation APIs in production — pricing legibility, retirement risk, fallback design — applied to the video field. All prices are published figures as of August 18, 2026.

The 30-Second Summary

Bottom line: the market has converged on audio-by-default, per-second billing, 15–30 second clips. Within that: Grok's $0.05/s sets the price floor, the quality boards are a three-way between Seedance 2.0, MiniMax H3, and Gemini Omni Flash, and Seedance 2.5 stands alone on length and reference capacity. That's the August 2026 map.

What's Actually New in Seedance 2.5

Seedance 2.5 was announced at ByteDance's Volcano Engine FORCE conference on June 23, 2026, shipped as a model and creator product on July 31, and opened its developer API via BytePlus ModelArk on August 7. The published feature set:

• 30-second one-shot generation — roughly double the prevailing 10–15 second ceiling, in a single pass
• Up to 50 reference assets per request: as many as 30 images, 10 videos, and 10 audio tracks
• Synchronized audio at no extra charge — the per-second rate includes audio
• 4–30 seconds at 480p/720p/1080p, plus region-level editing that redraws part of a frame

Pricing runs on BytePlus token billing: $10.70 per million tokens without video input, $6.40 per million with video input. ByteDance's published 5-second 16:9 examples work out to $0.514 at 480p and $1.156 at 720p — roughly $0.10/s and $0.23/s. Note that resellers add margin (EvoLink, for example, lists 720p at $0.293/s), so your effective rate depends on which door you call through.

The previous generation is still very much alive. Seedance 2.0 launched in China in February 2026 (TechNode put pure generation at about $0.14/s), reached international APIs in April via OpenRouter and others (listed from $0.067/s), and gained 4K output at the June FORCE event. As covered below, Seedance 2.0 still leads the image-to-video arena as of August 2026 — 2.5 hasn't accumulated enough votes yet.

Pricing Comparison (as of August 18, 2026)

Per-second billing has become the norm, which makes comparison easier. Two caveats: token-billed models (Seedance, Gemini Omni Flash) are converted from published sample calculations, and the "15-second clip" column is naive per-second × 15 math (Omni Flash computed at its 10-second maximum) — real costs shift with resolution, audio settings, and inputs.

Primary sources: xAI's model list, the Gemini API pricing page (Veo 3.1 and Gemini Omni Flash token rates), BytePlus ModelArk's published rates and sample math (Seedance), and MiniMax H3's published rate. Kling, Runway, and Wan run credit systems without flat public tables, so those rows are third-party aggregations from July 2026.

Three billing details that are easy to miss:

• Audio billing splits the field. Seedance 2.5 and Grok include audio in the rate; Veo 3.1's per-second rate changes with audio on or off. If your social output needs sound (it does), compare effective with-audio rates.
• The same model costs different amounts through different doors. Official API, official resellers, and aggregators differ on both price and rate limits. The table above uses official-channel figures wherever they exist.
• "Cost per clip" depends on the length ceiling. A 30-second explainer is one Seedance 2.5 call, or two stitched calls (plus seam management) on a 15-second model. Estimate by "how many calls per deliverable," not per-second rate alone.

Where the Arena Stands (August 18, 2026)

Artificial Analysis's Video Arena ranks models by Elo from blind, same-prompt pairwise votes. As of this writing:

• Text-to-video (with audio): 1. Gemini Omni Flash (Elo 1239), 2. MiniMax H3 (1237), 3. Seedance 2.0 720p (1222)
• Image-to-video (with audio): 1. Seedance 2.0 720p (1197), 2. MiniMax H3 (1189), 3. Gemini Omni Flash (1187), 4. grok-imagine-video-1.5 (1111), 10. Veo 3.1 (1086)

Two reading notes. First, these are blind preference votes, not guarantees on your specific job (product-shape fidelity, Japanese audio, and so on). Second, Seedance 2.5 and the newest Grok versions aren't meaningfully reflected yet — new models take weeks to accumulate votes. The durable signal is less "who is first today" than "who keeps showing up near the top": Seedance, MiniMax, and Google.

Which Model for Which Job

Vertical short-form at volume, cost first — Grok Imagine Video. The official $0.05/s is the floor among major models: a 15-second vertical clip for $0.75. xAI led its API launch (January 29, 2026) with generation-speed claims, which fits high-cadence social pipelines. Arena-wise it currently sits mid-pack (I2V #4, Elo 1111) — this is the pick for unit cost and speed, not peak quality.

Character and product consistency from references — Seedance 2.5. A 30-image/10-video/10-audio reference budget is unmatched among current APIs. Keeping a brand character's look, motion, and voice consistent across posts is the officially pitched use case — and Seedance 2.0's #1 standing on the I2V arena backs the family's strength in reference-driven work.

30-second explainers and tutorials — effectively Seedance 2.5 or nothing. A 30-second one-shot has no equal among major APIs at this writing (most cap at 10–15 seconds). For recipes, before/afters, and step-by-steps that don't fit 15 seconds, it removes stitching entirely.

Iterating conversationally — Gemini Omni Flash. Multi-turn, conversational generate-and-edit ("a bit brighter," "swap just the last cut") is its pitch, and it leads the T2V arena. With a 10-second cap, it suits perfecting a single cut over long-form.

Ad-grade quality and 4K — Veo 3.1 Standard, then MiniMax H3. Veo 3.1 offers 4K and fine-grained quality tiers at the segment's top rates ($0.40–$0.60/s). MiniMax H3 delivers 2K with stereo audio at $0.13/s — and is the rare open-weight release in this class.

What the Sora 2 Shutdown Teaches

OpenAI notified developers on March 24, 2026, closed the Sora app and web experience on April 26, and retires the Sora 2 API on September 24 (timeline). No successor has been announced at this writing.

This isn't an outlier; it's the norm in this field. On the image side, Imagen 4 was retired on August 17, 2026, and we went through a forced migration off older Gemini image models ourselves in June. When you pick a video model, weigh "can we leave cleanly when it dies" as heavily as output quality. Concretely:

• Keep prompts and reference assets portable rather than tuned to one model's dialect
• Route generation jobs through an abstraction layer, not hard-coded model names
• Stand up a second route on a different vendor from day one

As Sora 2 replacements go, the published specs read straightforwardly: Seedance 2.5 or Veo 3.1 for general work, Grok when unit cost rules.

Honest Caveats

• This article contains no in-house quality benchmarks of video models — it is a synthesis of official pricing, announcements, and public arena data. Judge quality on your own jobs.
• Per-second figures for token-billed models are conversions from published samples and move with resolution, aspect ratio, and audio settings.
• Kling, Runway, and Wan rates are reference values derived from credit systems; effective rates depend on your plan.
• This market moves in weeks — this summer alone brought Seedance 2.5, MiniMax H3, and Grok Imagine Image 2.0. This is a snapshot dated August 18, 2026.

So Which One Should You Pick

• Volume economics and speed → start with Grok Imagine Video ($0.05/s).
• Character/product consistency, 30-second lengths → Seedance 2.5, with your reference assets prepared in force.
• Perfecting single cuts interactively → Gemini Omni Flash.
• Ad-grade output and 4K → Veo 3.1 Standard, with MiniMax H3 as the value alternative.
• Currently on Sora 2 → run migration tests against the above before September 24.

One practical note from the social-media trenches: a surprising share of "we need video" jobs are satisfied by animating the image assets you already generate — slideshow motion plus narration — at a fraction of generated-video cost and with zero model-retirement risk. Sorting those jobs out first is the most reliable cost reduction available before you commit to full video generation.

Want to go from AI images to narrated social videos without a camera? Start with Adpicto free — no credit card required, one pipeline from AI image generation to slideshow videos and captions.

Read Next

The image-side map, in the same format, is in the AI image model comparison (2026). For foundations, see how AI image generation works for social media; for the platforms where short video decides outcomes, our TikTok guide and Instagram guide.

In short: Grok sets the floor, Seedance–MiniMax–Google hold the quality podium, and Seedance 2.5 owns length and references. And as September 24 reminds us — whichever you pick, don't skip the exit design.