AI video generators are tools that produce video from a text prompt, a script, or existing footage using machine learning. HokAI tracks 31 tools in this category as of August 2026, split into three distinct products: generative text-to-video models like Runway and Kling AI, AI avatar tools like HeyGen, and AI-assisted editors like CapCut.
Summary: Buyers shopping for the best AI video generator are usually comparing three unrelated products: generative models, avatar tools, and AI editors. Pick Kling AI or Runway to generate footage from a prompt, HeyGen for talking-head avatars, or CapCut if you already have footage and just need AI editing.
Runway's Standard plan charges about 23 cents for a second of Gen-4.5 video at $12 a month, while Kling AI's $6.99 Standard plan produces a comparable 1080p second for about 13 cents, almost a third cheaper. That gap sits inside a HokAI category that lists 31 tools under one label, and most of them are not competing with each other at all.
Seven of those 31, including Runway and Kling AI, generate raw video from a text or image prompt. Three, including HeyGen and Synthesia, generate a talking avatar reciting a script. The rest, from CapCut to Descript, are editors that add AI features to footage you already shot. A buyer scanning a ranked "best AI video generator" list is often comparing tools that solve three different jobs, and the per-second math above only applies to the seven actually generating video from nothing.
Ask what footage you're starting with, and the category splits cleanly. Three buckets, three different jobs. If you have no footage and want a prompt to become a moving image, you need a generative model: Runway, Kling AI, Luma Labs Dream Machine, Pika, or Vidu.
If you have a script and need a person to deliver it without a camera or an actor, you need an avatar tool: HeyGen or Synthesia. If you already have a recording, a podcast, or raw clips and want AI to caption, cut, dub, or repurpose them, you need an editor: CapCut, Descript, or one of a dozen similar tools HokAI tracks in the same category.
None of these three groups is a substitute for the other two. A marketing lead who needs a talking-head product demo will not solve that problem with Runway, no matter how good Gen-4.5 looks in a demo reel. A podcaster who needs faster editing will not solve that with Kling AI. The question "which AI video generator should I buy" only has an answer once you know which of the three jobs you actually have.
Four questions narrow 31 tools to a short list, and they work whether or not you read the rest of this guide.
What are you starting with: nothing, a script, or footage? This is the bucket question above, and it eliminates two-thirds of the category immediately.
What does a second, or a minute, actually cost at the volume you need? Every tool in this category prices in credits, not dollars, and the conversion rate is not the same across vendors. A subscription that looks cheaper on the sticker can cost more once you compute the real unit price, which is what the next three sections do.
Does the free tier remove watermarks, or just let you preview the product? Runway's free tier is 125 one-time credits, not a monthly allowance, so it is a trial, not a plan. HeyGen's free tier caps output at 3 videos a month with no watermark removal. A "free" tool that cannot ship a usable, unbranded file is not actually free for commercial work.
Do you need the output every month, or once? Several tools in this category, including Kinovi and Shorz, sell non-expiring one-time credit packs instead of subscriptions. For a single campaign or a one-off explainer, that avoids paying for a recurring plan you will cancel after one use.
These four questions matter more than any ranked list because they are testable against your own project before you pay for anything. A ranked list tells you what reviewers liked. These questions tell you whether the tool solves the job in front of you, which is a different question with a different answer for almost every buyer.
Runway prices its flagship Gen-4.5 model at 12 credits per second, according to Runway's own pricing page. On the $12-a-month Standard plan (625 credits), that works out to roughly 52 seconds of Gen-4.5 video for $12, or about 23 cents a second. Pro, at $28 a month for 2,250 credits, drops that to about 15 cents a second. Max, the $76-a-month plan that replaced Runway's old Unlimited tier, brings it down to roughly 10 cents a second.
Kling AI undercuts Runway at every comparable tier, though the gap narrows near the top. Kling's pricing runs 6 credits per second for 720p output with no audio, up to 12 credits per second for 1080p with native audio, according to third-party plan trackers monitoring Kling's pricing page. Kling's own site returned an access error to automated requests during this research.
On the $6.99-a-month Standard plan and its 660 monthly credits, a full-quality 1080p-with-audio second costs about 13 cents, versus 23 cents on Runway's equivalent tier. On Kling's $64.99 Premier plan, that same 1080p-with-audio second runs about 10 cents, which is close to what Runway charges on its $76 Max plan. The price advantage that makes Kling the cheaper entry point mostly disappears once both vendors are compared at their higher tiers.
Luma Labs Dream Machine used to be the cheapest way into this bucket, with a $9.99-a-month Lite tier. That plan is gone. Luma folded Dream Machine into its Luma Agents pricing in March 2026, and the individual plans now start at $30 a month for 10,000 credits, with no free tier on the current ladder. A ranking built on last year's prices would still list Luma as the budget option; it is not one anymore.
Two smaller players are worth naming without a full teardown. Pika and Vidu both sell sub-$10 entry tiers with commercial-use rights unlocked from their first paid plan, which makes either a reasonable place to test a workflow before committing to Runway or Kling AI credits. Neither currently publishes output quality benchmarks that would justify picking one over the two market leaders for a paying client's final deliverable.
HeyGen charges 20 credits per minute for its premium Avatar IV and V models. On the Creator plan ($29 a month, 600 credits), that is 30 minutes of premium avatar video for about 97 cents a minute. Pro, at $49 a month for 1,000 credits, works out to roughly the same 98 cents a minute.
The per-minute price barely moves between HeyGen's two mid tiers. What changes is total volume and, at Business ($149 a month plus $20 a seat), the addition of team seats rather than a cheaper rate.
Synthesia costs more per minute at every comparable tier. Its Starter plan runs $18 to $29 a month for 120 minutes a year, which is $1.80 to $2.42 a minute depending on billing cycle. Creator, at $64 to $89 a month for 360 minutes a year, works out to $2.13 to $2.97 a minute. That is roughly double HeyGen's rate for a similar-length talking-head clip.
The gap is real. It is not really about video quality; both vendors' avatars are used in enterprise training and marketing content. It is about what the subscription buys beyond the video: Synthesia leans on brand controls, SSO, and a larger library of stock avatars aimed at compliance-heavy teams, while HeyGen's pricing is built around raw output volume.
A five-person startup producing weekly product-update videos gets more minutes for less money from HeyGen. A regulated enterprise standardizing avatar training content across departments is often paying for Synthesia's governance features, not just its video.
CapCut restructured its plans in early 2026. What used to be the free-adjacent Pro tier was renamed Standard and now costs $9.99 to $10 a month, while a new Pro tier at $19.99 a month took its place with roughly 200 AI credits, a 4K export, and about 1TB of cloud storage, according to plan trackers tracking the change.
Those AI credits get consumed fast. An AI avatar render costs 20 to 40 credits, and a short text-to-video clip runs 5 to 15 credits, so 200 credits covers somewhere between 13 and 40 AI-generated clips before a top-up is needed. CapCut's base free tier still exports at 1080p without a watermark, which makes it usable for basic template-based editing even without a subscription.
Descript is the stronger pick for anyone editing by transcript, which is most of the podcast-to-video and interview-repurposing workflow. Its free tier gives 60 minutes of media a month and 100 one-time AI credits, though exports carry a watermark. Hobbyist, at $16 to $24 a month, unlocks 10 hours of media and 400 AI credits with watermark-free 1080p export. Creator, at $24 to $35 a month, raises that to 30 hours, 800 credits, and 4K export.
Neither tool is trying to win the other's job. CapCut is built for short-form social cuts and templates, Descript for long-form transcript editing where cutting a word means cutting the matching frame of video.
This category is not mandatory. Not everyone shopping the "AI video generator" label needs a subscription at all. A team that needs one polished 90-second explainer for a single launch is usually better served by a freelance editor working from a $79.99 one-time Filmora license or a Kinovi one-time credit pack than by a recurring plan they will use once and forget to cancel.
A solo creator whose actual bottleneck is finding a repeatable hook or format, not production quality, will get more value from studying what performs in their niche than from any of the 31 tools in this guide. And a team already paying for a full production pipeline, an editor, a colorist, motion graphics, will not replace that with any tool here. The honest use case for this category is closing gaps in a workflow, not replacing a team that already exists.
There is a fourth group worth naming: teams whose real requirement is regulatory or legal, not creative. Training content that has to carry indemnification language, or footage that will run through a compliance review, usually rules out the smaller generative and editor tools by default, regardless of price, until each vendor's terms of service are checked against that specific requirement. No per-second calculation in this guide substitutes for that review.
The obvious objection to all the math above is that cost per second stops being the deciding factor once output quality varies enough between vendors. A brand shooting a hero ad for a national campaign is not going to pick Kling AI over Runway to save 5 cents a second if Runway's motion consistency holds up better across a 10-shot sequence and Kling's does not. That trade-off is real. Neither vendor publishes a benchmark that settles it for every use case.
The math in this guide still matters for the much larger set of buyers producing volume, not a single hero shot: social ads, product variants, translated versions of the same clip, or a weekly content cadence where the same workflow runs dozens of times a month. At that volume, a 30% to 50% gap in per-second cost compounds into a real budget line, and it is the number most rankings never compute.
Runway retired its old Unlimited plan for Max within the past year, and Luma cut its cheapest entry tier entirely in the same window. The next vendor to restructure pricing, not the next model release, will be what decides which bucket's math changes first.
An AI video generator like Runway or Kling AI creates new video from a text or image prompt, with nothing filmed beforehand. An AI video editor like CapCut or Descript works on footage you already have, adding AI features such as captions, background removal, or transcript-based cutting. They solve different problems and are rarely substitutes for each other.
It depends on the vendor and resolution. Runway's Gen-4.5 costs about 23 cents a second on its $12-a-month Standard plan, dropping to roughly 10 cents a second on its $76 Max plan. Kling AI runs cheaper at comparable tiers, around 13 cents a second on its $6.99 Standard plan for full 1080p output with audio.
Few free tiers in this category remove watermarks entirely. Runway's free plan is a one-time 125-credit trial rather than a recurring allowance, and HeyGen's free tier caps output at 3 videos a month without watermark removal. CapCut's base free tier is the exception: it exports at 1080p without a watermark, though its paid AI credits are separate.
HeyGen is cheaper per minute at every comparable tier. Its premium avatars cost roughly 97 to 98 cents a minute on the Creator and Pro plans, while Synthesia runs $1.80 to $2.97 a minute depending on tier and billing cycle. Synthesia's higher price generally buys brand governance and compliance features that HeyGen's plans do not emphasize.
Kling AI is the cheaper choice per second of finished video at every tier below Runway's top plan, and the gap is largest on entry-level plans. Runway becomes more competitive at its $76 Max tier, where its per-second cost nearly matches Kling AI's Premier plan. Pick Kling AI to minimize cost per clip, and Runway if motion consistency across a longer shot matters more than price.
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