Seedance 2.0 vs Veo 3.1: Which AI Video Model to Use

Short answer: pick Seedance 2.0 when you need multimodal reference control, clips up to 15 seconds, and a cheaper entry point with audio baked in; pick Veo 3.1 when you need the best lip sync, the most realistic motion, and resolution up to 4K. Both run on Prospolabs at the same USD-per-second price whether you use the UI or the API.

These two models took opposite design paths. Seedance 2.0 from ByteDance is built around orchestration: feed it text, images, video, and audio, and reference them by tag inside one prompt. Veo 3.1 from Google is built around fidelity: it is the model you reach for when a face has to talk convincingly and the footage has to look shot, not generated. Most teams end up using both, and on Prospolabs you do not have to choose a vendor up front.

Head-to-head

Reference modes

This is the clearest split. Seedance 2.0 is fully multimodal: it runs in text, image, or reference mode, and in reference mode it composes up to 9 images, 3 videos, and 3 audio clips, each cited inline as @Image1, @Video1, or @Audio1. That lets you pin a character, a location, a motion clip, and a voice into a single generation and direct how they combine. Veo 3.1 also supports text, image, and reference input, but its reference path is narrower: up to 3 reference images, and reference-driven clips cap at 8 seconds. If your work is composition-heavy, Seedance gives you more knobs.

Audio

Both generate audio natively rather than bolting it on afterward. Seedance 2.0 has always-on native audio, so even your cheapest 480p test clips come back with sound. Veo 3.1 is the stronger of the two on lip sync specifically: when a character speaks to camera, Veo lines mouth movement to dialogue more reliably. For ambient sound, music beds, and quick voiced drafts, Seedance is plenty. For talking-head and dialogue scenes that have to read as real, Veo 3.1 is the safer bet.

Resolution

Seedance 2.0 outputs up to 1080p. Veo 3.1 goes up to 4K. If your deliverable is web, social, or in-app playback, 1080p is already past what most viewers will see. If you are mastering hero shots for large screens or want headroom for crops and reframes in post, Veo 3.1's 4K is the deciding factor.

Duration

Seedance 2.0 generates 4 to 15 second clips. Veo 3.1 generates 4, 6, or 8 second clips. The 15-second ceiling matters more than it sounds: longer single generations mean fewer cuts to stitch and fewer continuity breaks when a shot needs to breathe. For B-roll, continuity, and longer beats, Seedance has the edge. For tight, high-fidelity cuts, Veo's 8 seconds is usually enough.

Price

All prices below are USD per second on Prospolabs, billed by the second, identical in the UI and the API, with failed runs auto-refunded. Retail-equivalent rates are shown for reference (roughly 40 percent higher).

At the entry tier, Seedance 2.0 at 480p ($0.09/sec) is the cheapest way to get a clip with sound, since its audio is always on. At 720p the two are close once you turn Veo's audio on ($0.18 vs $0.24). At the top end Veo 3.1 is the only one offering 4K, and that capability carries the price. Full per-model breakdowns live on the price comparison page.

Cheaper tiers worth knowing

Both families have budget variants for drafts and high-volume work. Seedance 2.0 Fast runs $0.07/sec at 480p and $0.15/sec at 720p. On the Veo side, Veo 3.1 Lite is the cheapest option anywhere here at $0.03/sec for 720p and $0.048/sec for 1080p, and Veo 3.1 Fast sits at $0.06/sec audio off and $0.09/sec audio on. Use these for iteration passes, then promote the keepers to the standard tier for final renders. If cost is your main constraint, the cheapest AI video API breakdown ranks every tier.

Which should you choose?

Choose Seedance 2.0 when the job is reference composition or longer continuity. If you are assembling a character, a setting, and a motion reference into one shot, or you need 15-second clips, or you want audio on every cheap test, Seedance is the workhorse. Its multimodal tagging is the most direct creative control of the two.

Choose Veo 3.1 when realism and dialogue are the point. Talking-head footage, lip-synced characters, and anything destined for 4K masters belong here. It costs more, but for hero shots that have to survive scrutiny on a big screen, that is the right place to spend.

In practice most production teams use both: Seedance for the bulk of B-roll, iterations, and continuity, Veo 3.1 for the few premium shots that justify the cost. Because Prospolabs is one API across every frontier model with one USD balance, that split costs you nothing in integration overhead. Top up from $5, call either model with the same request shape, and switch a slug to swap engines.

Comparing against other models too? See Veo 3.1 vs Kling V3 for the cinematic-fidelity matchup, or the full best AI video APIs roundup to place both of these in the wider field.