LTX 2.5 Pro Serverless API

Generate 1080p video with native audio and multi-shot scenes.

POST /v2/ltx-2.5-pro · 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": "The waterfall thunders down the mossy cliffs, churning the turquoise pool below as mist swirls through golden sunbeams; tropical birds glide across the frame while the camera slowly drifts in. Ambient rainforest sounds of rushing water, distant birdsong and gentle wind.",
11    "aspect_ratio": "16:9",
12    "resolution": "1080p",
13    "duration": 6,
14    "fps": 24,
15    "generate_audio": True,
16    "camera_motion": "auto",
17}
18job = client.submit_async("ltx-2.5-pro", **payload)
19print(job.request_id)                         # available immediately
20try:
21    result = job.wait(timeout=900, interval=2.0)
22    print(result["status"])                  # COMPLETED
23    print(result.get("output"))              # model output (e.g. video URL)
24except InferenceTimeout as e:
25    print("still running:", e.request_id)    # re-poll later with this id
26except InferenceFailed as e:
27    print("failed:", e.detail)
28
29# Fast models (<=600s) can use the one-liner instead:
30# result = segmind.run("ltx-2.5-pro", **payload)

API Endpoint

POSThttps://api.segmind.com/v1/ltx-2.5-pro

Parameters

promptrequired
string

Describe scene, action, camera and audio in one flowing paragraph. Add sound cues for native audio.

Default: "The waterfall thunders down the mossy cliffs, churning the turquoise pool below as mist swirls through golden sunbeams; tropical birds glide across the frame while the camera slowly drifts in. Ambient rainforest sounds of rushing water, distant birdsong and gentle wind."
aspect_ratiooptional
string

Output orientation. Use 16:9 for landscape, 9:16 for portrait and social.

Default: "16:9"
Allowed values :
"16:9""9:16"
camera_motionoptional
string

Forces a camera move. Leave on auto to let the prompt drive it.

Default: "auto"
Allowed values :
"auto""static""dolly_in""dolly_out""dolly_left""dolly_right""jib_up""jib_down""focus_shift"
durationoptional
integer

Clip length in seconds: 6, 8 or 10. Use 6 for single actions, 10 for sequences.

Default: 6
Allowed values :
6810
fpsoptional
integer

Frame rate. Choose 24 or 25 for cinematic, 50 for smooth action.

Default: 24
Allowed values :
242550
generate_audiooptional
boolean

Generates a synchronized audio track. Turn off for silent video.

Default: true
imageoptional
string (uri)

Optional first frame; adding it switches to image-to-video. Use a high-resolution JPEG or PNG.

Default: "https://segmind-resources.s3.amazonaws.com/input/ltx-2.5-pro-input-b716084aed.jpg"
last_frame_urioptional
string (uri)

Optional closing frame for image-to-video interpolation. Cannot combine with automatic duration.

Default: null
resolutionoptional
string

Output resolution, 720p or 1080p. Pick 1080p for final delivery, 720p for drafts.

Default: "1080p"
Allowed values :
"720p""1080p"

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-2.5-pro

    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