Runway Act Two API

runway/act_two
RunwayML Act Two delivers quick video generation performance suitable for creative workflows, balancing speed and quality for short-form videos.
Output
$0.065 / sec
Released
Dec 4, 2025

How to use Runway Act Two API

Install any OpenAI-compatible SDK, point it at api.aimlapi.com/v1, and set the model to runway/act_two.
import requests, time

headers = {"Authorization": "Bearer " + AIMLAPI_KEY}
job = requests.post(
    "https://api.aimlapi.com/v2/video/generations",
    headers=headers,
    json={
      "model": "runway/act_two",
      "prompt": "A serene timelapse of clouds over a mountain range"
    },
).json()
gid = job["id"]

while True:
    res = requests.get(f"https://api.aimlapi.com/v2/video/generations?generation_id={gid}", headers=headers).json()
    if res.get("status") in ("completed", "error"):
        break
    time.sleep(5)
print(res["video"]["url"])
const headers = {
  Authorization: `Bearer ${process.env.AIMLAPI_KEY}`,
  "Content-Type": "application/json",
};
const job = await (await fetch("https://api.aimlapi.com/v2/video/generations", {
  method: "POST",
  headers,
  body: JSON.stringify({
    "model": "runway/act_two",
    "prompt": "A serene timelapse of clouds over a mountain range"
  }),
})).json();

let res;
do {
  await new Promise((r) => setTimeout(r, 5000));
  res = await (await fetch(`https://api.aimlapi.com/v2/video/generations?generation_id=${job.id}`, { headers })).json();
} while (!["completed", "error"].includes(res.status));
console.log(res.video.url);
# submit the generation — the response contains the job "id"
curl -X POST https://api.aimlapi.com/v2/video/generations \
  -H "Authorization: Bearer $AIMLAPI_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"runway/act_two","prompt":"A serene timelapse of clouds over a mountain range"}'

# then poll until status is "completed" — video.url holds the result
curl "https://api.aimlapi.com/v2/video/generations?generation_id={id}" -H "Authorization: Bearer $AIMLAPI_KEY"

OpenAI-compatible — swap the base URL and it works with your existing SDK.

Runway Act Two API Pricing

TypePrice
Output
$0.065 / sec

Runway Act Two vs other models

ModelInputOutputContextBest for
$0.065 / sec
Video generation
$0.26 / sec (variable)
Video generation
$0.13 / sec (variable)
Video generation
$1.95 / 1M tokens
$22.75 / 1M tokens
Video generation
$0.09243–$1.014 / sec (by resolution)
Cinematic video + native audio

Frequently asked questions

Runway Act Two takes image, text, video as input and returns video.

Runway Act Two became available on December 4, 2025.

Runway Act Two is priced at $0.065 / sec.

Runway Act Two is billed per generation — a fixed charge per output rather than by prompt length.

Yes, Runway Act Two accepts image input as well as a text prompt.

Runway Act Two was built by Runway.

Send a request to v2/generate/video/runway/generation with runway/act_two as the model id.

Yes. Runway Act Two is served through AI/ML API, so the same key and endpoint format used for other models applies.

It generates expressive, full-body performance videos by transferring the motion from a driving video onto a subject.

Start building with Runway Act Two

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