Runway Gen Alpha Turbo Image to Video Serverless API

Runway Gen-3 AlphaTurbo is a cutting-edge AI tool that transforms static images into dynamic videos with exceptional fidelity and motion

~27.38s
POST /v2/runway-gen3-alphaturbo · submit + poll
 1# pip install "segmind>=1.1.0"
 2# export SEGMIND_API_KEY="YOUR_API_KEY"
 3from segmind import SegmindClient, InferenceFailed, InferenceTimeout
 4
 5# Async (v2) — recommended for long-running / video models.
 6# run() blocks up to 600s; submit_async + job.wait(timeout=...) sets a longer
 7# deadline and keeps the request_id so you can re-poll later.
 8client = SegmindClient()                      # reads SEGMIND_API_KEY
 9payload = {
10    "promptText": "an astronaut with a mirrored helmet running in the field of sunflowers",
11    "promptImage": "https://segmind-sd-models.s3.amazonaws.com/display_images/runway-gen3-input.png",
12    "seed": 56698,
13    "ratio": "16:9",
14    "duration": "5",
15}
16job = client.submit_async("runway-gen3-alphaturbo", **payload)
17print(job.request_id)                         # available immediately
18try:
19    result = job.wait(timeout=900, interval=2.0)
20    print(result["status"])                  # COMPLETED
21    print(result.get("output"))              # model output (e.g. video URL)
22except InferenceTimeout as e:
23    print("still running:", e.request_id)    # re-poll later with this id
24except InferenceFailed as e:
25    print("failed:", e.detail)
26
27# Fast models (<=600s) can use the one-liner instead:
28# result = segmind.run("runway-gen3-alphaturbo", **payload)

API Endpoint

POSThttps://api.segmind.com/v1/runway-gen3-alphaturbo

Parameters

promptImagerequired
string (uri)

URL of the input image to be animated. A HTTPS URL pointing to an image. Images must be JPEG, PNG, or WebP and are limited to 16MB

Default: "https://segmind-sd-models.s3.amazonaws.com/display_images/runway-gen3-input.png"
promptTextrequired
string

Text prompt to describe the desired animation effect

Default: "an astronaut with a mirrored helmet running in the field of sunflowers"
durationoptional
integer

Duration of the animation in seconds

Default: 5
Allowed values :
510
ratiooptional
string

The aspect ratio of the output video.

Default: "16:9"
Allowed values :
"16:9""9:16"
seedoptional
integer

Seed for random generation

Range: 1 - 99999

Response Type

Returns: Video

Asynchronous requests (v2)

Use Async for video, long-running (>~60s), or high-concurrency workloads; Sync is simplest for fast image & LLM calls. Async submits a request and you poll it to completion.

  1. 1
    POST /v2/runway-gen3-alphaturbo

    Submitreturns request_id, status_url, response_url

  2. 2
    GET /v2/requests/{id}/status

    Polluntil COMPLETED or FAILED

  3. 3
    GET /v2/requests/{id}

    Resultfinal response body

Status states

QUEUEDAccepted, waiting for a worker
PROCESSINGRunning on a worker
COMPLETEDDone — result body is ready
FAILEDErrored (incl. content/RAI blocks)
  • A FAILED request is served as HTTP 422 — the body still carries the error detail.
  • An unknown or expired request_id returns HTTP 404.
  • Results are retained for 1 hour, then expire.
  • Content / RAI blocks surface as FAILED, not a separate state.
  • Track completion by polling the status endpoint.

Common Error Codes

The API returns standard HTTP status codes. Detailed error messages are provided in the response body.

400

Bad Request

Invalid parameters or request format

401

Unauthorized

Missing or invalid API key

403

Forbidden

Insufficient permissions

404

Not Found

Model or endpoint not found

406

Insufficient Credits

Not enough credits to process request

429

Rate Limited

Too many requests

500

Server Error

Internal server error

502

Bad Gateway

Service temporarily unavailable

504

Timeout

Request timed out