LTX 2 Fast Serverless API

Fast, high-quality text-to-video generation by Lightricks.

~48.00s
POST /v2/ltx-2-fast · 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    "prompt": "A seamless cinematic sequence: gliding through a sunlit forest with beams of light, pushing upward through treetops into the open sky, breaking through drifting clouds into clear blue atmosphere, rising into the stratosphere, finally emerging into outer space looking down on Earth glowing in silence, cinematic, photorealistic",
11    "duration": 8,
12    "resolution": "2k",
13    "generate_audio": True,
14}
15job = client.submit_async("ltx-2-fast", **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("ltx-2-fast", **payload)

API Endpoint

POSThttps://api.segmind.com/v1/ltx-2-fast

Parameters

promptrequired
string

Text prompt for video. Detail-oriented for better results.

durationoptional
integer

Video duration in seconds. Choose longer for detailed scenes.

Default: 8
Allowed values :
6810
generate_audiooptional
boolean

Adds audio to the video for enhanced experience. Use for dynamic scenes.

Default: true
imageoptional
string (uri)

Optional image input for video generation. Use detailed images for complex backgrounds.

Default: null
resolutionoptional
string

Video resolution quality. Use 4k for high detail.

Default: "2k"
Allowed values :
"1080p""2k""4k"

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/ltx-2-fast

    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