How much does one video cost?

It depends on the settings. The exact price is on the button before you start, and it updates with every change.

What if it doesn't work out?

If the run fails at the provider, no credits are charged. If the result is ready but you don't like it, press “Edit and retry”: the prompt and settings stay.

Which frame shapes are there?

16:9, 9:16, 4:3, 3:4, 1:1, 21:9. 9:16 suits Reels, Shorts and stories; 16:9 suits YouTube and websites.

5s, 10s. Pick the length in the settings before you start.

Can I use my own picture?

Yes: add up to 1 — from your computer, from the Library or as an element. The model takes them as a base or a reference.

How is Runway Gen-4.5 different from Runway Aleph 2?

Both are in the Runway line-up. Switch between them in the line-up at the top of the page — the price of each is on its card.

Where are the results kept?

Every finished result goes to your Library. From there you can download it, publish it in the Community or use it as the base for the next one.

Runway Gen-4.5

Runway · Video · 5, 10s · 16:9, 9:16, 4:3…

API

Saved

Example

Your video will appear here

Fill in the settings and press Run. The result is also saved to your library.

Price

Reference price

No published price yet - this model is not in the public price list.

What the price depends on

This model is billed per second of output, so length is the biggest lever on the price.
Resolution and quality settings change the price. Change one and the number above follows.
A generation the provider fails is not charged. A chat answer is charged for what the model wrote and thought, even if you stop it.

Prices for every model Top up

Prices are in credits. What a credit costs is on the pricing page.

Which one to pick

Model	Key specs	Price from
Runway Gen-4.5· you are here	5, 10s · 16:9, 9:16, 4:3…	—
Runway Aleph 2	16:9, 4:3, 3:2…	—
Runway Gen-4	5, 10s	—
Runway Aleph	—	—
Runway Gen-4 Turbo	5, 10s	—
Runway Act-Two	—	—
Runway Expand	5, 10s · 3:5, 5:3	—

About the model

Runway Gen-4.5: six aspect ratios, 5 or 10 seconds, and a seed you can pin to repeat a result.

Produces: Video
Takes: text, pictures
Prompt: 1,800 characters
Length: 5s, 10s
Frame shape: 16:9, 9:16, 4:3, 3:4, 1:1, 21:9

What you can set

Every setting of this model and the choices it allows — the same as in the form.

Input images
one file
Aspect ratio
16:99:164:33:41:121:9
Duration
5s10s
Seed
your own text

For developers

Run this from your own code

The same request the Generate tab sends, with the settings you have chosen.

Model id:runway-gen-4-5

curl -X POST https://seedara.ai/api/v1/generate \
  -H "Authorization: Bearer $SEEDARA_API_KEY" \
  -H "Content-Type: application/json" \
  --data '{
  "model": "runway-gen-4-5",
  "prompt": "Describe the shot: subject, action, camera move, lighting...",
  "params": {
    "aspect_ratio": "16:9",
    "duration_seconds": 5
  }
}'

This snippet updates as you change the form. Copy it once the settings are the ones you want.

Request parameters

What goes in `params`, by the names the API uses.

Optional

Left out unless you set them - the provider then applies its own default.

Parameter	Type	Accepted values	Default
`image_urls` Input images	images	up to 1 files	—
`aspect_ratio` Aspect ratio	one of a list	`16:99:164:33:41:121:9`	16:9
`duration` Duration	one of a list	`510`	5
`seed` Seed	whole number	—	—

How a generation runs

POST /v1/generate answers immediately with a job_id - it does not wait for the result.
Poll GET /v1/jobs/{id} until status is completed or failed.
A completed job carries output_url - the finished file.

curl https://seedara.ai/api/v1/jobs/JOB_ID \
  -H "Authorization: Bearer $SEEDARA_API_KEY"

Questions

Frequently asked about Runway Gen-4.5

New

Start now

Your first video —
in a minute

Describe what you want to see — the model does the rest.

Takes you to the settings — prompt, format and price are already there

No auto-charges
Pay only for a finished result
Works are kept in your Library

100credits as a gift

5–10sLength

16:9 · 9:16 · 4:3Frame shape