Sora 2 vs Veo 3 vs Kling 3: Which AI Video Model Should You Use?

Sora 2, Google Veo 3.1 and Kling 3 Pro are three of the strongest AI video models available today, and they are good at different things. Sora 2 generates 720p clips of 4, 8 or 12 seconds with synchronized audio always included, and it is the strongest of the three at physical realism. Google Veo 3.1 generates 720p or 1080p clips of 4, 6 or 8 seconds, lets you turn audio off, and accepts up to three reference images to keep a subject consistent across shots. Kling 3 Pro generates 1080p clips of 3 to 15 seconds and can structure a story of up to six shots in a single generation. All three are available inside the VIBE app on iOS and Android, so the practical answer is to run your prompt through more than one and keep the result that works.

The short version

There is no single winner here, and anyone who tells you otherwise is selling one model. These three sit at roughly the same quality level and diverge on the things that decide a project: how long the clip can run, whether the model produces sound, how much control you have over a repeated subject, and how well the output holds up when something physical happens on screen.

Pick by constraint, not by reputation. If your clip has to be 12 seconds, Veo 3.1 is out before you write a word. If you need silence under a music bed, Sora 2 is the awkward choice because its audio is always on. If you want a three-shot sequence that stays coherent, Kling 3 Pro is the only one of the three that will structure it for you.

Sora 2: physics and sound, in one generation

Sora 2 is OpenAI’s video model, and its defining trait is world simulation — how objects behave when they collide, fall, splash, or get picked up. Prompts that involve real physical events tend to come back more believable than they do on models that are essentially very good at motion but weak on cause and effect. Liquid pouring, fabric settling, a skateboard landing, a ball bouncing off a wall: this is the category where Sora 2 earns its place.

The second trait is audio. Sora 2 always produces a soundtrack — synchronized dialogue and sound effects generated with the picture, not layered on afterwards. There is no audio toggle in the app because the model has no audio parameter to toggle. That is a real advantage when you want a talking scene or an ambient environment without editing sound in a second tool. It also accepts a reference image, so a clip can start from a photo instead of from text.

Where Sora 2 falls short

Base Sora 2 outputs 720p. If you need 1080p you have to move up to Sora 2 Pro, which keeps the same 4, 8 and 12 second options and adds the higher resolution. There is no square or 4:3 frame — you get 16:9 and 9:16 only, which matters if you publish square feed posts. And because audio is always generated, Sora 2 is a poor fit for clips destined to sit silently under a licensed music track or a voiceover you already recorded.

Google Veo 3.1: control, reference images, and an off switch for audio

Veo 3.1 is Google DeepMind’s model and the most controllable of the three. It generates at 720p or 1080p, in 4, 6 or 8 second clips, in 16:9 or 9:16. It follows camera direction and lighting language closely, which makes it a strong choice when you have a specific shot in your head rather than a vibe.

Two features do most of the work. The first is reference-to-video: you can supply up to three reference images so the model keeps the same subject looking like itself across separate generations. That is how you get a recognisable character, mascot, or product through a multi-clip sequence instead of a slightly different-looking one each time. The second is last-frame input, which lets you set the frame a clip should end on — useful for building a transition into the next shot.

Audio on Veo 3.1 is optional. Generating without audio also costs fewer tokens, so if you are scoring the video yourself there is no reason to pay for a soundtrack you will delete. Two lighter siblings exist in the same app: Veo 3.1 Fast, which keeps 720p/1080p and the last-frame input at a lower cost, and Veo 3.1 Lite, which is 720p only with audio always on and is the cheapest way into the Veo family. Veo 3 Fast is also available, but it is text-to-video only — it takes no image input.

Where Veo 3.1 falls short

Eight seconds is the ceiling, and that is the binding constraint. Anything longer has to be assembled from multiple generations, which is exactly why the reference-image feature matters so much on this model. The aspect ratio choice is also limited to 16:9 and 9:16. And Veo 3.1 with audio costs several times what Sora 2 does per second, so it is the wrong tool for bulk drafting — draft on something cheap, then finish on Veo.

Kling 3 Pro: length, and stories told in shots

Kling 3 Pro is Kuaishou’s flagship. It generates 1080p at any whole-second length from 3 to 15 seconds, in 16:9, 9:16 or 1:1. Fifteen seconds is nearly double Veo 3.1’s maximum and three seconds longer than Sora 2’s, which changes what you can do in one generation — a full product demo beat, a complete gag, a hook and a payoff instead of just a hook.

Its distinctive feature is structured multi-shot generation: you can write a story of up to six shots, each with its own prompt, and get them back as one coherent clip. Instead of generating three separate videos and hoping they cut together, you describe the sequence and the model handles the continuity. Audio is optional and multi-language, and both text-to-video and image-to-video are supported.

Kling 3 Standard is the same family at a lower price with the same 1080p output and the same 3–15 second range. It is the sensible tier for drafting a shot list before committing to Pro for the final render.

Where Kling 3 Pro falls short

It is the most expensive per second of the three when audio is enabled, and a 15 second clip at that rate is a real commitment — this is not the model to iterate on. It also has no reference-image system equivalent to Veo 3.1’s three reference images, so cross-clip subject consistency has to come from the multi-shot feature or from image-to-video with a fixed starting frame. Resolution tops out at 1080p; there is no 4K path here.

The same scene, written three ways

A prompt is not portable in the way people assume. Sora 2 will generate sound whether or not you asked for it, so you may as well direct it. Veo 3.1 rewards explicit camera and lighting language in a short, single-action shot. Kling 3 Pro can take a shot list. Here is one coffee-shop scene rewritten for each.

Which should you pick? Start from the goal

Product ads and e-commerce creative

Veo 3.1, with audio switched off. Product work is short by nature — a rotation, a pour, a reveal — so the 8 second ceiling is rarely a problem, and the reference images keep the actual product looking like the actual product across a set of variations. Turn audio off, cut the cost, and score the ad in your editor where you have control. If the shot involves liquid, powder, or anything falling and settling, run the same prompt on Sora 2 as well and compare the physics.

Cinematic b-roll

Kling 3 Pro at 1080p. Longer clips give an editor something to cut into rather than a fragment that has to be used whole, and the multi-shot feature produces establishing-plus-detail coverage in one go. For 4K b-roll you need a different model entirely: LTX 2.3 Fast outputs up to 2160p, and LTX 2.5 Fast scales from 720p to 4K.

Social hooks for TikTok, Reels and Shorts

Sora 2 in 9:16. The always-on audio is an advantage here rather than a limitation — a hook arrives with a spoken line and native sound already attached. Four seconds is enough for a hook, eight is enough for a hook and a turn. Veo 3.1 Fast is the cheaper alternative when you are producing a batch and testing which one holds attention.

Keeping a character consistent across clips

Veo 3.1, because of the three reference images — this is the feature built for exactly that problem. The alternative approach is Seedance 2.5, which takes up to four reference images to hold a character across clips, or image-to-video on any model with the same starting frame every time. Kling O3 Pro adds voice binding, which keeps a character’s voice consistent across generations as well as their face. If you are producing a series rather than a one-off, decide this before you generate the first clip.

Long clips

None of these three, if length is the only thing that matters. Seedance 2.5 generates up to 30 seconds, the longest single clip available in the app. LTX 2.5 Fast, LTX 2.3 Fast and Flux 3 all reach 20 seconds. Kling 3 Pro, Kling O3, WAN 2.7 and Happy Horse 1.1 reach 15. Sora 2 stops at 12 and Veo 3.1 at 8. Longer is not automatically better — a 30 second generation costs far more than a 5 second one and gives you less control over what happens in the middle — but if a single unbroken take is the requirement, this is the order.

Realistic physics

Sora 2, then Kling 3 Pro. Sora 2 was built around world simulation and shows it when objects interact. Kling 3 Pro handles human motion and cloth convincingly at 1080p and gives you the length to let a physical action complete. Veo 3.1 is excellent within a controlled shot but has the least room to let something play out.

How to run the comparison yourself

This takes about five minutes and settles the question for your subject matter rather than in the abstract.

1. 1Write one prompt with a clear subject, one action, a camera direction and a lighting description. Keep it under about 60 words.
2. 2Generate it on a cheap model first — Seedance Pro Fast or LTX 2.5 Fast — purely to check that the scene reads the way you pictured it. Fix the prompt before spending anything.
3. 3Run the fixed prompt on two of the three flagships at the shortest duration each one offers.
4. 4Compare on the thing your project depends on: motion believability, face and hand quality, text legibility, or whether the sound is usable.
5. 5Regenerate the winner at the duration and resolution you actually need.

Two habits save the most money. Draft short — a 4 second test tells you almost everything a 12 second one would, at a third of the cost. And change one thing at a time: if you rewrite the prompt and switch models at once, you learn nothing about either.

What none of the three can do

A few jobs sit outside this comparison entirely. If you want a photo of a person to speak a recorded script with matched lip movement, none of these models does that — the Talking Avatar model does, from a photo plus a voice recording and no prompt at all, and the free PRUNA V model does a lighter version of the same thing. If you want the video timed to a piece of music or a voiceover you already have, WAN 2.7 and PRUNA V accept an uploaded audio track and sync to it. And if you need 4K, look at the LTX models rather than at any of the three above.