- What it is: Runway is a web-based AI video tool. You type a description or upload a photo, and it generates a short video clip. Nothing to install.
- Gen-4.5 is Runway’s current flagship video model. Runway calls it “the world’s best video model” — that is Runway’s own claim about its own product, not an independent test result.
- To start: open runway.com in a browser, make an account, pick a video tool, upload an image or write a prompt, generate, then re-generate with a tweaked prompt. Expect several tries.
- Cost: Runway’s site advertises “Try free, cancel anytime” for its Creative plan but does not spell out free-plan limits there. Check Runway’s own pricing page before you count on anything being free.
Runway is an AI video generator you use in a web browser: you describe a shot in plain words or upload a still image, and Runway produces a short video clip from it. Its current headline model is Gen-4.5. Runway describes itself as an all-in-one creative platform for generating and editing video, images and audio in one workspace, with agent and workflow tools for chaining steps together.
That last part is the bit people miss. Runway is not only a “type words, get video” box. It is closer to a small studio in a browser tab, where generating a clip is one step among trimming, restyling, adding audio and stitching things together.
What Gen-4.5 actually does
Gen-4.5 is the model — the trained system that turns your instructions into moving pictures. In practice you point it at one of two starting points:
- A text prompt. You write what you want to see and the model generates it from scratch. This is text-to-video, and it is a normal, working feature across the whole category, Runway included.
- An image. You upload a photo or an AI-generated still and the model animates it. This is image-to-video, and for beginners it is usually the better door to walk through, because you already control how the shot looks before anything moves.
Runway publishes model details and release notes on its own site, and those details change with each version. Clip length, resolution options and which tools a given model is wired into have all shifted between Runway generations, so treat any number you read in an old blog post as expired. Check the model card inside the Runway workspace for the version you are actually using.
Primary source for Runway’s own description and the Gen-4.5 claim: runway.com.
Which starting point to pick
| Approach | You supply | Best for | Main drawback |
|---|---|---|---|
| Text-to-video | A written description | Inventing a scene from nothing; quick concept tests | You get less control over faces, products and branding |
| Image-to-video | A still image, plus optional motion notes | Product shots, a specific character, matching a brand look | You need a good still first |
| Video-to-video / editing tools | Existing footage | Restyling or cleaning up something you already filmed | Results depend heavily on source quality |
If you are leaning toward the middle row, our guide to turning an image into a video with AI walks through the whole workflow, and it applies to Runway as much as to any other tool.
How to make your first clip
- Open runway.com and create an account. Runway runs in the browser, so there is no download step.
- Pick a video tool from the workspace. Runway groups its generation and editing tools in one place; the names and layout get reorganised fairly often, so look for the video generation section rather than following a menu path from memory.
- Choose your input. Upload an image, or switch to the text prompt field.
- Write a short, concrete prompt. One subject, one action, one camera move. “A red ceramic mug on a wooden table, steam rising, camera slowly pushes in.”
- Generate, then watch it at full size. Small previews hide the problems.
- Change one thing and generate again. This is the actual job. First attempts are rarely usable, and changing five things at once teaches you nothing about which change helped.
Prompting habits that save you attempts
- Describe the camera separately from the subject. “Locked-off shot” or “slow pan left” gives the model something specific to do.
- Keep the motion small. Ambitious action — a person running, then turning, then speaking — is where clips fall apart.
- Name the light. “Late afternoon window light” changes the whole result more reliably than a list of adjectives.
- Avoid text in the frame. AI video models still mangle lettering and signage.
- Fix the still, not the video. If you are animating an image and the image is soft, sharpen it first — our notes on improving photo quality for free cover that.
Windows, macOS, Linux and phones
Because generation happens on Runway’s servers rather than your machine, the operating system matters much less than it would for locally installed software. The differences are small and practical.
Windows and macOS
Use a current Chrome, Edge, Firefox or Safari. Uploads and downloads land in your normal browser download folder. A weak graphics card is not a blocker — the heavy lifting is remote — but a large screen genuinely helps when you are judging whether a clip holds up.
Linux
Chrome or Firefox on Linux works the same way, since this is a website rather than a native app. Where Linux users hit friction is video playback codecs in some minimal browser builds; if an exported file will not preview locally, open it in VLC rather than assuming the export failed.
Phones and tablets
Runway has offered mobile access, but which platforms and which tools are available on mobile has changed over time, so check the app store listing rather than trusting an older recommendation. Generating on a phone is fine for experiments; reviewing detail on a phone screen is not. For phone-first options generally, see our roundup of the best AI apps for iPhone.
What it costs
Runway’s own site says “Try free, cancel anytime” for its Creative plan, but it does not state free-plan limits on that page. So there is a free entry point, and we are not going to guess at how many seconds or generations it includes — that number moves, and a wrong figure here would cost you real money. Read the plan details on Runway’s pricing page, reachable from the Pricing link on runway.com, before you commit.
One thing worth understanding: nearly every AI video subscription meters you in credits or generation allowances rather than unlimited use, and re-generating the same shot eight times consumes eight lots of whatever you are being metered on. Budget for iteration, not for single takes.
How per-second model pricing compares
The figures below come from the Convly models database and are developer API prices — what a business pays to call a model from its own software. They are not what a consumer subscription includes, and they should not be read as Runway plan pricing. They are useful only as a rough sense of what a second of AI video costs the industry.
| Model | Maker | API price |
|---|---|---|
| Wan 2.5 | Alibaba | from $0.05 per second |
| Veo 3.1 | from $0.05 per second | |
| Kling 2.5 Turbo Pro | Kuaishou | from $0.07 per second |
| Seedance 2.5 | ByteDance | from $0.097 per second |
For context on what is no longer an option: OpenAI’s Sora 2 and Sora 2 Pro were retired on 24 September 2026 when the Videos API shut down with no replacement, so anything still recommending them as a purchase is out of date. MiniMax H3 (Hailuo 3.0) is another active competitor worth knowing about. If you want the wider field, we keep a comparison of the best AI video generators, and a separate list of the best free AI video generators if budget is the deciding factor.
Limits, privacy and staying honest
The honest version of what to expect:
- Hands, faces and text are still weak points. Watch for fingers merging, faces drifting between frames, and signage turning into nonsense.
- Continuity is hard. Two clips generated from similar prompts will not match perfectly. Plan cuts, not long continuous scenes.
- What you upload leaves your computer. Anything you feed a cloud video tool is processed on someone else’s servers. Read the terms on how your uploads and outputs may be used, and keep confidential material, client footage and images of other people’s children out of it.
- Labelling. Many platforms require AI-generated or AI-altered content to be disclosed, and the specifics differ by platform and region. Check the rules where you are publishing and label your work.
Three lines not worth crossing, whatever the tool makes technically easy: do not generate fake reviews or testimonials from customers who do not exist; do not use a real person’s face or voice without their clear permission; do not pass AI-generated work off as your own in a school, workplace or contest where that is against the rules. If you are making ads, our notes on making UGC ads with AI without breaking the rules cover the consent and disclosure side, and our piece on deepfakes explains why the face-and-voice rule is not a technicality.
Frequently asked questions
Is Runway free?
Runway’s site advertises “Try free, cancel anytime” for its Creative plan, so there is a way in without paying, but Runway does not state the free-plan limits on that page. Check the pricing page on runway.com for what is currently included before planning a project around it.
Do I need a powerful computer?
No. Runway generates in the cloud, so a mid-range laptop with a modern browser and a decent internet connection is enough on Windows, macOS or Linux. The bottleneck is upload speed and screen size, not your graphics card.
Is Gen-4.5 really the best video model?
Runway says so — it calls Gen-4.5 “the world’s best video model” — but that is a vendor’s claim about its own product. Competing models from Google, Kuaishou, ByteDance, Alibaba and MiniMax are all in the same conversation, and which one wins depends on the shot you are trying to make. Generate the same prompt in two tools and judge the output yourself.
How long are the clips?
Short, and the exact maximum depends on the model version and the tool you use inside Runway. These numbers change with each release, so read the model details in the workspace rather than trusting a figure from an article. Plan on assembling several short clips rather than generating one long take.
Can I use Runway videos commercially?
That depends on your plan and Runway’s current terms, which is a genuine “read the licence” situation rather than something to take on trust from a third party. Check the commercial-use terms attached to the specific plan you are on, and keep in mind that platform labelling requirements still apply to paid work.
What should I try first if I have never made AI video?
Animate a single still image you already own — a product photo, a landscape, a drawing — with one small camera move. It is the fastest way to see what the model does well without fighting a complicated prompt, and it teaches you the iteration habit you will need for everything else.