AI video API · Runway

Runway Gen 4.5 API pricing per second

Generate video with Runway's Runway Gen 4.5 through the Cut.Pro API. You see the price before you generate and pay only for what you use.

  • Pay as you go, no subscription
  • 15 free credits on a new account
  • Free quote before every call
From$0.20per secondR$0.67 · 12 credits5 seconds at 1080p: $1.00Updated November 10, 2026

Pricing

Runway Gen 4.5 pricing by mode and resolution

ModeResolutionPrice per secondIn reaisCredits
From an image1080p$0.20R$0.6712 credits
Text only1080p$0.20R$0.6712 credits

Updated November 10, 2026. Prices use the cheapest credit pack: 1 credit costs $0.0179 (R$0.0599).

Limits

What Runway Gen 4.5 accepts in each request

Modes
From an image and Text only
Duration
5 or 10 seconds
Resolutions
1080p
Aspect ratios
21:9, 16:9, 4:3, 1:1, 3:4, 9:16
Reference images
up to 1

Code

How to call Runway Gen 4.5 free quote, generation and result

BODY='{"model":"runway/runway-gen-4.5","prompt":"a dog surfing at sunset","seconds":5,"resolution":"1080p","aspect_ratio":"9:16"}'

CREDITS=$(curl -s -X POST https://api.cut.pro/api/v1/generations/quote \
  -H "X-Api-Key: $CUTPRO_API_KEY" \
  -H "Content-Type: application/json" \
  -d "$BODY" | jq .credits)

curl -X POST "https://api.cut.pro/api/v1/generations?wait=60" \
  -H "X-Api-Key: $CUTPRO_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d "$(jq -c --argjson credits "$CREDITS" '. + {credits: $credits}' <<< "$BODY")"
Read the docs

Questions

API questions before your first call

At 1080p, each second costs $0.20 and a minute comes to $11.97 (R$40.05, 669 credits). Each generation runs 5 or 10 seconds.
Create an account, generate an API key, and request a free quote. The smallest Runway Gen 4.5 generation costs 56 credits, more than the 15 free credits, so you can use them to try a lower-cost model in the catalog.
From an image: the image you send becomes the first frame. Text only: the prompt describes everything.
No. Buy a credit pack by card, or in reais with Pix from Brazil, and spend it on Runway Gen 4.5 and every other model with the same key.
No. The Cut.Pro key calls Runway Gen 4.5 without a Runway account, with one balance for every model in the catalog.
Yes. With a CPF or CNPJ and full address in your billing details, the nota fiscal is issued after each payment is confirmed.

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Generate with Runway Gen 4.5 today

Create a key, get a free quote and pay only for what you generate.

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