Which AI Video Generator Is Best? Answer Six Questions About Your Shot

Which AI video generator is best? Not a question anyone can answer for you, and the lists that try are answering a different one — "which model is most popular this quarter" — because the models here are not competing on a single axis. Several of them cannot even do the job you are about to ask for.

So this page gives you no ranking. It gives you a procedure: six questions about your shot, answered in order, each one eliminating models before quality enters the conversation at all. Whatever survives, you test, with the protocol at the end.

If you want the answer handed to you instead, the companion piece is the roster: the 2026 shortlist with one named pick per use case. Come back here when the recommendation does not fit your shot.

All figures below are credits in the SynthPulse Video studio, at 4 seconds unless stated.

1. Does the clip need sound?

Only one model here returns its own synchronized audio: Veo 3.1 Fast, at 150 credits for 720p and 163 for 1080p. Every other model on the platform is submitted with audio generation off — which is also the tier their credit prices assume — and comes back silent.

If your shot lives on dialogue, a footstep landing on the right frame, or anything that has to be in sync with the picture, the question is already answered and the other nine models are irrelevant. If you are adding sound in an edit anyway, Veo's price stops being special and you move on.

One quirk worth knowing before you move on: Veo 3.1 Fast is the only model whose price does not scale with length. Its 8-second clip costs the same 150 credits as its 4-second one. Nothing else on the platform does that.

2. How long is the unbroken take?

Not "how long is the video" — how long is the longest single shot with no cut in it. Models differ structurally here, not just in price. Three groups: most accept 4, 8 or 12 seconds; Kling 2.6 and Kling 2.5 Turbo Pro accept exactly 5 or 10 seconds and nothing else, because their API rejects any other value; Veo 3.1 Fast accepts 4 or 8 only.

That eliminates on a fact, not a preference. If you need a clean 10-second take, the Kling 2.x pair is the cheapest route by a distance: 210 credits on 2.5 Turbo Pro, 275 on 2.6. The nearest alternative is 12 seconds of Kling 3.0 Pro at 420, or 12 seconds of Seedance 2.0 at 1,230.

And 12 seconds is the ceiling everywhere. Longer than that is an edit, not a generation — which means the real question is usually "how many shots," not "how long."

3. Do you already have the frame?

If the composition exists — you shot it, designed it, or generated it in the Image studio — you are in image-to-video, and that changes both the shortlist and the economics.

Grok Imagine 1.5 is image-to-video only and costs 45 credits at 720p, 24 at 480p. It cannot generate from a prompt alone, which reads as a limitation until you notice what it buys: you settle framing, subject and lighting at image prices (10 to 55 credits a render), then iterate on motion alone at 24 credits a try.

Everything else on the platform accepts a reference image too, at exactly the same price as text-to-video. Nobody charges extra for starting from a frame. So the real content of this question is not "which model" but "have you moved the composition problem into images yet" — because if you have any control over the frame, that route is almost always the cheaper path to a usable clip.

4. What resolution do you actually ship at?

This eliminates more models than people expect, because three of them are 720p-only in practice — Kling 2.6, Kling 2.5 Turbo Pro and MiniMax H3 — and Grok Imagine tops out at 720p too.

The trap in the other direction is assuming 1080p means the expensive tier. It does not. Seedance 1.5 Pro renders 1080p for 76 credits, less than half of Kling 3.0 Pro at the same resolution and about 7% of Seedance 2.5's 1,140. If your delivery spec says 1080p and your shot is simple, check the cheap model's 1080p price before you accept a premium one.

One more: nothing here delivers 4K. If your spec demands it, you are upscaling afterwards regardless of which model you choose, so 4K cannot be a selection criterion.

5. What does an accepted clip cost?

This is the question almost nobody asks, and it inverts the rankings — because the price on the button is the price of one attempt, not the price of a result.

Nobody accepts the first generation. Assume a realistic hit rate of one usable clip in four attempts, and multiply:

• Seedance 1.5 Pro at 480p: 18 × 4 = 72 credits per accepted clip
• Kling 3.0 Pro at 720p: 140 × 4 = 560
• Seedance 2.5 at 720p: 630 × 4 = 2,520
• Seedance 2.5 at 1080p: 1,140 × 4 = 4,560

Now the ladder version, which is what an experienced user actually does: five attempts on Seedance 1.5 Pro at 480p to find the shot (90), then one or two runs of the proven prompt on Kling 3.0 Pro at 720p (140–280). That is 230 to 370 credits for the same accepted clip — against 4,560 if you iterate at the top of the range.

The model you pick matters far less than where in the range you iterate. A cheap model absorbing the failures and an expensive model doing the final render beats either one alone, every time.

6. How many wrong answers can you afford?

Turn your budget into attempts before you choose, not after. Divide what you are willing to spend on this one shot by the per-attempt price of each surviving candidate, and drop any candidate where the answer is under about eight.

Under eight attempts you are not evaluating a model, you are hoping — one lucky or unlucky roll dominates everything you conclude. That threshold is what rules out drafting on a flagship: the same budget that buys eight attempts on Seedance 1.5 Pro at 480p buys well under one at Seedance 2.5 / 1080p. Same money, two completely different working styles — one where you learn what the model does, and one where you find out afterwards.

Credits are one pool across video, images and songs, so this arithmetic is the same whether the budget came from a plan or a top-up.

Then run a 400-credit bake-off

Once the six questions leave you with two or three candidates, stop reading comparisons — including this one. Published benchmarks are run on someone else's prompt, and prompt adherence varies wildly by subject matter.

1. Write one prompt and freeze it. Subject, action, camera, framing, light, grade. Do not tune it per model; you are testing models.
2. Run each candidate twice at its cheapest tier. Twice, because single generations vary enough to mislead you — one lucky roll is not a result.
3. Score one thing: did the motion hold together? Not colour, not sharpness, not anything a resolution difference explains.
4. Then check the price of the winner at your delivery spec, not at the tier you tested.

Two candidates, two runs each, at cheap tiers, lands around 300 to 400 credits. That is less than one 1080p Seedance 2.5 attempt, and unlike any article, it answers the question for your shot.

What a bake-off will not tell you

The protocol above has real blind spots. Know them before you over-read the result:

• It tests one shot, not your project. Prompt adherence is subject-dependent; a model that nails product turns can fall apart on human hands. A winner on shot one is a hypothesis for shot two.
• It cannot test continuity. No model here guarantees your character looks identical in clip two, and two runs of one prompt will never reveal that. Reference images help and do not settle it.
• It cannot test text in frame. Lettering warps under motion on every model, so the honest response is to keep it out of the moving region rather than to shop for a model that survives it.
• A cheap-tier winner may not stay the winner at your delivery tier. Re-check the one shot at full spec before you commit a project to it.
• Failed generations are refunded, so the cost of running the protocol is your time, not your balance. That is the reason to run it rather than argue about it.

So which one is best

There is no winner, but the method has a default outcome: a cheap model for iteration and an expensive one for the final render. Answer question 1 and question 3 honestly and the pairing usually picks itself. When two candidates survive all six questions, the 400-credit bake-off is cheaper than another hour of reading.

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Prefer a recommendation to a procedure? The 2026 shortlist, one pick per job. The top-end head-to-head: Kling 3.0 vs Seedance 2.0. Settings and prompts for the Seedance family: how to use Seedance 2.0 and 2.5. Model pages: Kling · Seedance · Grok Imagine. Or start in the Video studio.