Runway Gen4 Aleph Serverless API

Runway Aleph revolutionizes video editing with intelligent automation for seamless object and environment manipulation.

~169.26s
POST /v2/runway-gen4-aleph · 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    "seed": 42,
11    "video": "https://segmind-resources.s3.amazonaws.com/input/c08771b9-b671-4c12-9ea7-af4048b9d194-894a8bdf-6064-40ea-a78d-06c1abff262b.mp4",
12    "prompt": "make it winter",
13    "aspect_ratio": "9:16",
14}
15job = client.submit_async("runway-gen4-aleph", **payload)
16print(job.request_id)                         # available immediately
17try:
18    result = job.wait(timeout=900, interval=2.0)
19    print(result["status"])                  # COMPLETED
20    print(result.get("output"))              # model output (e.g. video URL)
21except InferenceTimeout as e:
22    print("still running:", e.request_id)    # re-poll later with this id
23except InferenceFailed as e:
24    print("failed:", e.detail)
25
26# Fast models (<=600s) can use the one-liner instead:
27# result = segmind.run("runway-gen4-aleph", **payload)

API Endpoint

POSThttps://api.segmind.com/v1/runway-gen4-aleph

Parameters

promptrequired
string

Text prompt to guide video transformation. Try 'in summer' for seasonal changes.

Default: "make it winter"
videorequired
string (uri)

Input video for transformation, max 16MB. Use high-quality clips for best results.

Default: "https://segmind-resources.s3.amazonaws.com/input/c08771b9-b671-4c12-9ea7-af4048b9d194-894a8bdf-6064-40ea-a78d-06c1abff262b.mp4"
aspect_ratiooptional
string

Choose desired video aspect ratio. Use '21:9' for cinematic effects.

Default: "16:9"
Allowed values :
"16:9""9:16""4:3""3:4""1:1""21:9"
reference_imageoptional
string (uri)

Image to influence video style. Select vibrant images for colorful outputs.

Default: null
seedoptional
integer

Random seed for reproducibility. Set specific numbers for consistent results across runs.

Default: 42

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-gen4-aleph

    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