The 15-second question
Write the brief first, then pick. If the brief is "our customer says this specific sentence to camera for fifteen seconds", OmniHuman 1.5 is the model, and it happens to be the cheaper one for that job.
If the brief is "the product is used in a real-looking kitchen, the camera pushes in, and someone says something enthusiastic", Kling 3.0 is the model, because none of that scene exists in OmniHuman's world and no amount of prompting will create it.
The mistake worth avoiding is choosing by price and then discovering the model cannot stage your ad. At 15 seconds the gap is 490 credits against 780 at 1080p, which is meaningful but not decisive. Capability is decisive.
What OmniHuman 1.5 controls: the person and the words, nothing else
OmniHuman 1.5 is audio-driven. It receives an image and a voice track, and animates the person in that image delivering that track, with facial movement and gesture that follow the audio. The words are guaranteed because the model never generates them.
There is no duration setting and no resolution setting. Length follows the voice track, so a longer script produces a longer video, and 720p and 1080p are priced the same, which means there is never a reason to choose 720p on this model.
There is also no camera and no scene. Whatever was behind the person in your source photo is what is behind them in the video. For a UGC-style ad that is often exactly right, since the format is supposed to look like someone filming themselves rather than a production. For a staged product moment it is a hard limit.
The catalog prices are 490 credits for 15 seconds and 980 for 30, about $4.80 and $9.60 on the $49 Starter plan, roughly 33 credits per second.
What Kling 3.0 controls: the shot, the references, the resolution
Kling 3.0 is a prompt-driven image-to-video model with native audio. You give it a start frame and a description, and it renders 5, 10 or 15 seconds with motion, camera work and its own soundtrack, including speech.
Its reference handling is the feature that matters for campaign work: alongside the start frame it accepts up to six more reference images, seven in total, so a product, a face or a set can stay consistent from clip to clip across a batch.
It also has the widest resolution range in the picker alongside Seedance 2.0, including a genuine 4K tier. The 15-second ladder runs 625 credits at 720p, 780 at 1080p and 1,170 at 4K, about $6.13, $7.64 and $11.47 on Starter.
The compromise is the same one every prompt-driven model makes: the dialogue is composed from your prompt rather than recited from a script. Short lines usually land close. A price, a promo code or a regulated claim is not something to leave to a prompt.
The 30-second wall
Kling 3.0 stops at 15 seconds per generation. OmniHuman 1.5 runs to 30 in one continuous take.
That matters more than it sounds, because a 30-second ad built from two 15-second Kling renders is not just two renders. It is a cut, a continuity problem across the join, and two prompt-guided performances that have to feel like the same person in the same moment. A 30-second OmniHuman take is one generation with no join at all.
In credits, 30 seconds of OmniHuman is 980. Two 15-second Kling renders at 1080p are 1,560, plus the edit. So for long single-speaker reads, OmniHuman is both structurally and financially the better route.
Under 15 seconds the wall is irrelevant and the comparison comes back to scene control against script control.
The real cost math at each length
Live prices on UGC Vids AI. OmniHuman 1.5: 490 credits for 15 seconds, 980 for 30, identical at 720p and 1080p. Kling 3.0: 210, 415 and 625 credits at 720p for 5, 10 and 15 seconds; 260, 520 and 780 at 1080p; 390, 780 and 1,170 at 4K.
Per second at 15 seconds: about 33 credits on OmniHuman, 42 on Kling 3.0 at 720p, 52 at 1080p and 78 at 4K.
The $49 Starter plan and its 5,000 credits therefore buys about 10 fifteen-second OmniHuman takes, or about 6 fifteen-second Kling 3.0 renders at 1080p, or 5 at 30 seconds on OmniHuman. On the $99 Growth plan at 12,000 credits, about 24 OmniHuman takes or 15 Kling renders.
Short clips flip the arithmetic. Kling 3.0 will sell you a 5-second render for 210 credits at 720p or 260 at 1080p, which is a cheap unit for hook testing. OmniHuman has no short tier in the same sense, because its length is set by your script rather than by you, so it is not the model to reach for when you want a three-second beat.
Six briefs and the model each one wants
Testimonials, founder reads and offer announcements: OmniHuman 1.5. Exact words, one take, up to 30 seconds, and cheaper at 15 than Kling 3.0 at 1080p.
Product-in-scene hero shots and anything with camera movement: Kling 3.0. There is no version of this Kling can lose, because OmniHuman does not generate scenes.
Multi-clip campaigns that need one product or one character to look identical across every asset: Kling 3.0, using its start frame plus up to six reference images.
Anything that will be cropped, reframed or run on a large screen: Kling 3.0 at 4K, chosen deliberately for the headroom rather than as a default.
Short hook tests: Kling 3.0 at 5 seconds. It is the only one of the two with a genuinely short, cheap unit.
Thirty-second single-speaker ads: OmniHuman 1.5, which does in one generation what Kling needs two renders and an edit to approximate.
Verdict: script control is cheaper here than scene control
It is unusual for the more constrained model to also be the cheaper one, but that is where these two land at 15 seconds. OmniHuman 1.5 delivers a guaranteed script, an unbroken take, no resolution premium and a 30-second ceiling, for 490 credits. Kling 3.0 delivers a staged scene, camera direction, seven reference slots and 4K, for 780 at 1080p.
If most of your ads are a person talking about a product, make OmniHuman the default and treat Kling 3.0 as the model you escalate to for hero shots and campaign consistency. If most of your ads are product moments where the copy lives in captions and on-screen text, invert that.
Because both run in the same generator on one credit balance with no cap on video count, the split does not need to be decided up front. Render the same 15-second brief on each, put the two files side by side, and let the ad account settle it. Two 15-second renders sit well inside a single Starter month. The trial is $1 for 7 days. Cancel anytime.