Best AI Video Generator 2026: Veo 3.1, Kling 4, Seedance 2.5 and Runway Compared

If you have tried making a video with AI this year, you will have noticed it has gone from a fun demo to something genuinely usable remarkably quickly. The catch is that there are now so many models that picking one is half the battle... so we did the same thing we did with AI image generators: gave the 4 that matter most the same brief, and watched what came back.

The short version: Google's Veo 3.1 is still the best all-rounder, and it nailed our test first time, sound and all. Kling 4 is the most cinematic and the one to pick for longer clips. Seedance 2.5 is the most realistic for the money, and Runway Gen-4.5 is the friendliest place to work, but its footage has fallen behind the other 3.

The contenders

These are the 4 video models we see brands and agencies actually using right now. Newest release first.

Worth knowing: OpenAI's Sora appears to have been withdrawn, and Google is steering developers from Veo towards its newer Gemini Omni models, which now sit at or near the top of the blind-vote leaderboards. We have stuck with Veo here because it is what most people can use today in Gemini and Flow.

We put them to the test

Veo 3.1 won our test outright: it was the only model to get every part of the brief right. We gave all 4 models exactly the same prompt, a close-up of a barista pouring latte art. It sounds simple, but it tests nearly everything a brand would care about: hands, pouring liquid, steam, light, a moving camera and sound, all in 1 shot.

The prompt: Close-up of a barista's hands pouring steamed milk into a flat white, forming a rosetta latte art pattern. Morning sunlight through a café window, steam rising from the cup, shallow depth of field. Slow camera push-in. Ambient café sound: milk steamer hiss, cups clinking, quiet chatter.

Veo 3.1 is the clip we would use. The rosetta forms properly, leaf by leaf, the light falls across the cup the way morning light does, and the steam wand hiss and the clink of the cup land exactly when they should. It was also the fastest, and the only one to give us 8 seconds by default.

Kling 4 is the most cinematic of the 4, with the strongest sunlight, real steam and a busy café behind. It is also the only one that gave us 1080p by default. But the pattern is closer to a tulip than a rosetta, a dark smudge appears in the foam towards the end, and it took about 15 minutes to arrive.

Seedance 2.5 gave us the most believable café, with customers chatting at the window, and the pour and the pattern both look natural. It lost marks for ignoring the sunlight (it looks like a grey morning) and for sound that is there but very quiet.

Runway Gen-4.5 is the weakest by some way. The milk looks too thick, the pattern becomes a swirl rather than a rosetta, odd blobs appear on the foam, there is no sunlight and there is no sound at all.

Each model ran once on its default settings, so this is the first clip each one gave us, not the best of several. Click play to hear the sound.

The scorecard

Scores are out of 5. The first 3 factors come from our own test; the rest come from each model's published specs and prices.

Factor by factor

1. Realism

Veo 3.1 and Seedance 2.5 share the top spot: in both clips the milk moves like milk and the hands look like hands. Kling 4 is close behind and arguably the most beautiful to look at, but the smudge in its latte art is the kind of small glitch a customer notices. Runway's milk and foam give it away as AI within a couple of seconds.

2. Prompt accuracy

Our prompt asked for 5 specific things: a rosetta, morning sunlight, steam, a slow push-in and café sound. Veo delivered all 5. Kling and Seedance each missed 1 (Kling's pattern, Seedance's sunlight), and Runway missed 3. Every model managed the camera move, which would not have been true a year ago.

3. Sound

3 of the 4 now generate sound and picture together, which is the biggest change in AI video over the last year. Veo's is the most convincing: in our test the steam wand hiss and the clink of the cup land exactly when you see them. Seedance's sound is right but very quiet. Runway generates silent video only, so you need to add music or effects yourself afterwards.

4. Clip length

Kling 4 and Seedance 2.5 both make clips of up to 30 seconds in 1 go, which is long enough for a full social ad. Kling 4 also lets you set up to 10 keyframes along the way, so you can plan a sequence shot by shot. Veo makes 8 seconds at a time and extends from there, and Runway tops out at 10.

5. Resolution

Veo 3.1 is the only one here offering 4K today. Kling 4 makes 1080p, with 4K announced but not yet widely available. Seedance 2.5 works at up to 1080p depending on where you use it, and Runway Gen-4.5 is 720p.

6. Cost

Prices are per second of finished video, in US dollars, as published through each model's API. Subscription apps work out cheaper per clip if you use them a lot.

7. Speed

Veo 3.1 was quickest by a distance: our clip was back in under 2 minutes. Runway and Seedance took about 3. Kling 4 took around 15 minutes for a 5-second clip, which may be partly down to launch-week demand, but if you are trying several versions of a brief it adds up fast.

8. Ease of use

Runway is the easiest place to make and edit video as a team, with a proper editor and its own editing model (Aleph) alongside Gen-4.5. Veo is built into the Gemini app and Google's Flow, so many people already have it. Kling's app is good and well organised. Seedance is the hardest to get at directly in the UK, and most people will meet it through CapCut or a third-party platform.

Who owns each model

3 of the 4 are made by tech giants whose main business is something else entirely, and 2 of those are Chinese. Only Runway is an independent company that does nothing but AI video. None of that makes one model better than another, but it does affect the terms you sign up to, where your uploads go and how likely a tool is to still be around in a few years.

Veo: Google

Veo comes from Google DeepMind, the AI lab Google bought in 2014, run by Sir Demis Hassabis from its London base. That gives it the deepest pockets of the 4 and the widest reach: Veo is built into the Gemini app, Google's Flow, YouTube Shorts and Google Cloud. For businesses already on Google Workspace or Google Cloud, it is usually the easiest one to get signed off.

Kling: Kuaishou

Kling is owned by Kuaishou, the company behind one of China's biggest short video apps and a rival to Douyin, TikTok's Chinese twin. Kling has become a serious business in its own right: Kuaishou reported more than RMB 850 million (about £90 million) of Kling revenue in the second quarter of 2026, up more than 200% on a year earlier. Kuaishou is looking at spinning Kling off as a separate company, with press reports putting its value at around $18 to 20 billion.

Seedance: ByteDance

Seedance is built by Seed, the AI research team at ByteDance, the private Chinese company that owns TikTok, Douyin and CapCut. That is why most people meet Seedance inside CapCut or ByteDance's Dreamina app rather than on its own. In the US, TikTok now sits in a separate joint venture in which ByteDance keeps a minority stake, but ByteDance still runs TikTok everywhere else, including the UK.

Runway: independent

Runway was founded in New York in 2018 and is the only company here that lives or dies by AI video. It raised $315 million in February 2026 at a $5.3 billion valuation, led by General Atlantic with Nvidia, Fidelity and AMD among the backers. That is a lot of money, but it is tiny next to the other 3, which helps explain why Runway is putting its effort into editing and production tools rather than trying to win on raw footage alone.

Why it matters

• Your uploads. If you give a model your own product photos, footage or faces, check where they are processed and whether the terms let the company train on them. This matters most in regulated sectors and for clients with strict data policies.
• Commercial use. Check the plan you are on actually allows commercial use. Free and entry-level tiers often do not.
• Staying power. A model owned by Google or ByteDance is unlikely to vanish, but it can be renamed, folded into something else or replaced (as Google is doing with Veo and Gemini Omni). Do not build a whole workflow around 1 tool.

Which one for which job

What this means for brands

AI video has gone from a party trick to something you can genuinely put in front of customers. A year ago, every clip had a tell: a sixth finger, a spoon melting into a cup, silence where the sound should be. In our test, 2 of the 4 models produced shots we would happily use in a social ad, sound included, for a few pounds each.

But the same rule applies as with images: the gap between the models is now smaller than the gap between using them well and using them badly. The hard part is not getting 1 beautiful 8-second clip. It is getting 20 that all show your real product, your real shop and the kind of people who actually buy from you. That takes reference images, a clear brief per shot, and someone checking every clip before it goes anywhere near your brand.

That is the work we do in our AI video service. If you would like to see what these models can do with your own products, get in touch.

Sources

• Kling 4.0 launch and specs (Cellcog)
• Kling 4.0 API pricing (Runware)
• Seedance 2.5 specs and availability (Gate.AI)
• Seedance 2.5 API pricing (CometAPI)
• Google Veo 3.1 pricing, October 2026 (CostGoat)
• Runway pricing (Runway)
• Runway Gen-4.5 features (The Rundown)
• Blind-vote AI video leaderboard (LLM Stats)
• Sora withdrawal and Kling 4 vs Veo 3.1 (Shattered)
• Veo and Google DeepMind (Wikipedia)
• Kuaishou second quarter 2026 results (Kuaishou)
• Kling revenue growth and spin-off plans (South China Morning Post)
• ByteDance business breakdown (Contrary Research)
• Runway raises $315M at a $5.3B valuation (TechCrunch)