Start with the price ladder, because it is unusually lopsided
Seedance 1.5 Pro: 100 credits for 5 seconds, 160 for 8 seconds, 245 for 12 seconds. Every render is 1080p, because the model has no resolution input at all. That works out to a flat 20 credits per second of finished video.
Seedance 2.0 at 720p: 140 credits for 5 seconds, 285 for 10, 425 for 15. At 1080p: 315, 635 and 950. At 4K: 660, 1,320 and 1,985. That is roughly 28 credits per second at 720p, 63 at 1080p and 132 at 4K.
Read those two ladders next to each other and one line jumps out. Seedance 1.5 Pro gives you a 1080p file for 100 credits. Seedance 2.0's cheapest 5-second option is 140 credits and it is 720p. The older model is both cheaper and higher resolution at the entry rung, which almost never happens in a model family.
In dollars on the $49 Starter plan: about $0.98 for a 5-second 1.5 Pro clip, $1.37 for a 720p 2.0 clip, $3.09 for a 1080p 2.0 clip and $6.47 for a 4K one.
What Seedance 1.5 Pro does well
Seedance 1.5 Pro takes a start image and a prompt and renders 5, 8 or 12 seconds with native audio. That covers a lot of what a UGC ad needs: someone holding a product, a lifestyle beat with ambient sound, a demonstration carried by a line of voiceover. What it will not do is recite a script word for word, because the dialogue is prompt-guided, so keep specific prices, guarantees and claims on one of the voice-driven models.
Because there is no resolution choice, there is also no way to accidentally pay for a tier you do not need. Every render comes back 1080p, at 20 credits per second, whatever you asked for.
The twelve-second ceiling is the honest limit. It is enough for a full hook plus a benefit line, and short of a complete 15-second direct-response read. If a single unbroken 15 seconds is a requirement, this is not the model.
What Seedance 2.0 adds for the extra credits
Three things, and it is worth naming them precisely because they are the entire case for the upgrade.
First, 4K. Seedance 2.0 is one of only two models on UGC Vids AI that renders at 4K, and the pricing is more forgiving than the pixel count suggests: 660 credits for 5 seconds rather than the four-times-1080p figure you would guess.
Second, fifteen seconds. Seedance 2.0 runs up to 15 seconds in one take against 1.5 Pro's 12. Those three seconds are the difference between a clip that has to end on the benefit and one that has room for a call to action.
Third, reference images. Seedance 2.0 accepts up to nine reference images in place of a single first frame, which is the mechanism for keeping one product, one model or one set consistent across an entire batch of clips. Seedance 1.5 Pro takes one start image and works forward from it. If you are producing a campaign rather than a clip, that is the feature you are actually buying.
Note that the reference-image mode and the single first-frame mode are alternatives, not additions. You either animate forward from one frame or you supply a set of references for the model to draw on.
When 4K is worth 132 credits a second, and when it is not
A 4K render is not sharper on a phone in feed. Both TikTok and Meta re-encode uploads aggressively, and a viewer on a 6-inch screen is not resolving the extra pixels. Paying 4K prices for a clip that will only ever run as a vertical in-feed ad is spending credits on something the platform throws away.
Where 4K earns its keep is headroom. Punch in on the product, reframe a wide shot into a vertical crop, hold a 16:9 master for connected TV or a landing page hero, or plan to reuse the same footage across placements: all of that is much easier when the source has pixels to spare.
Weigh it against the plan. A 15-second 4K Seedance 2.0 render is 1,985 credits, about $19.45 on Starter, which is close to 40% of a month's balance for a single clip. That can absolutely be the right call for a hero asset. It is a bad default.
A reasonable working rule: test in 1.5 Pro at 1080p, and only re-render a proven winner in 2.0 at 4K if you know what the extra resolution is for.
Clips per plan, both models
The $49 Starter plan carries 5,000 credits. On Seedance 1.5 Pro that is about 50 five-second clips, 31 eight-second clips or 20 twelve-second clips. On Seedance 2.0 at 1080p it is about 15 five-second clips, 7 ten-second clips or 5 fifteen-second clips. At 4K it is 7 five-second clips, or two fifteen-second ones.
Fifty attempts against fifteen is the whole argument. Ad testing is a numbers exercise, and a model that triples your attempts per month is worth more than one that improves any single attempt, right up until you have a winner worth finishing properly.
On the $99 Growth plan at 12,000 credits the same ratio holds: about 120 five-second 1.5 Pro clips, or about 38 at 2.0 in 1080p. Since there is no cap on video count and everything runs off one pool, you can spend a month at 90% 1.5 Pro and 10% 2.0 without changing plans.
Where each sibling belongs in a testing cycle
Hook and concept testing: Seedance 1.5 Pro. 1080p at 100 credits per 5-second attempt is close to the best attempts-per-dollar ratio available for a model that also generates audio.
Talking product clips under 12 seconds: Seedance 1.5 Pro. Native lip-sync is already there, and the extra Seedance 2.0 features do not apply.
Batch campaigns with a fixed product or character: Seedance 2.0, for the nine reference slots. Consistency across twenty clips is worth more than the per-clip saving.
Full 15-second single takes: Seedance 2.0, since 1.5 Pro stops at 12.
Hero assets, connected TV, or anything you will crop heavily: Seedance 2.0 at 4K, chosen deliberately, once.
Verdict: 1.5 Pro is the default, 2.0 is the exception
The upgrade case for Seedance 2.0 is real but narrow: 4K, 15 seconds, and nine reference images. Outside those three, you are paying roughly three times the credits at 1080p for a deliverable that 1.5 Pro would have handed you at 20 credits per second.
So invert the usual instinct about version numbers. Make Seedance 1.5 Pro your default render for testing and for most shipped clips, and treat Seedance 2.0 as a deliberate escalation you can point at a specific requirement.
Both models sit in the same generator on UGC Vids AI, on one credit balance, so the escalation is a dropdown rather than a migration. Render the same prompt on each and decide with two files in front of you rather than from a table. The trial is $1 for 7 days. Cancel anytime.