lightricks/ltx-2.3-pro/extend

Name: LTX 2.3 Pro Extend
Author: Lightricks

Ltx 2.3 Pro Extend by Lightricks - AI-powered video editing and transformation. Apply style transfer, motion control, lip-sync, and visual effects to existing videos with natural language instructions.

Input

Prompt(string)

Description of what should happen in the extended portion of the video.

Video URL(string)

The URL of the video to extend

Duration(integer)

120

Duration in seconds to extend the video. Maximum 20 seconds. Range: 1 to 20.

Idle

Example output — click Run to generate your own

Production endpoint

Send your first request

OpenAI-compatible endpoint with unified authentication and usage tracking.

POSThttps://api.sandbase.ai/v1/run

Model IDlightricks/ltx-2.3-pro/extend

Input Schema

3 parameters · 1 required · 2 optional

Parameter	Type	Required	Description
`prompt`	string	Required	Description of what should happen in the extended portion of the video. · Max length: 5000
`video`	string	Optional	The URL of the video to extend
`duration`	integer	Optional	Duration in seconds to extend the video. Maximum 20 seconds. · Min: 1 · Max: 20 · Default: 5

Output Schema

Field	Type	Description
`id`	string	Unique identifier for the generation task
`status`	string	Task status: pending, running, completed, failed, timeout
`model`	string	Model used for the generation
`outputs`	array	Array of output items
`outputs[].url`	string	URL of the generated artifact
`outputs[].content_type`	string	MIME type (e.g. image/png, video/mp4)
`error`	object \| null	Error details if failed, null on success
`error.type`	string	Machine-readable error type code
`error.message`	string	Human-readable error description

Async Workflow

This model uses asynchronous execution. Submit a request and poll for the result.

Submit — POST to /v1/run, receive an id
Poll — GET /v1/run/{id} until status is completed, failed, or timeout
Retrieve — Read outputs from the completed response

Code Examples

Ready-to-run snippets

# Step 1: Submit
curl -X POST https://api.sandbase.ai/v1/run \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
  "model": "lightricks/ltx-2.3-pro/extend",
  "video": "https://static.sandbase.ai/examples/lightricks/ltx-2.3-pro/extend/input_video_0.mp4",
  "prompt": "Continue the motion smoothly",
  "duration": 5
}'

# Step 2: Poll result (replace <id>)
curl https://api.sandbase.ai/v1/run/<id> \
  -H "Authorization: Bearer YOUR_API_KEY"

← Back to LTX 2.3 Pro Extend

API README

LTX 2.3 Pro Extend

LTX 2.3 Pro Extend is a LTX route built for video extension. It turns an existing clip plus a continuation brief into new footage that carries the source clip forward, giving creators a focused endpoint instead of forcing one generic workflow across materially different production tasks. The route belongs to a family known for audio-visual timing, cinematic motion, and shot-level controllability, so it is best evaluated as a creative system for intentional shots and assets rather than as a one-click novelty generator.

Use this endpoint when the input contract and deliverable match that job exactly. Its documented controls include duration (Duration in seconds to extend the video. Maximum 20 seconds). Together, these controls help teams plan predictable iterations, compare outputs under stable settings, and connect generation to iterative film, advertising, and social-video workflows without hiding the operational choices that shape the result.

Highlights

Purpose-built Video extension. The route accepts an existing clip plus a continuation brief and produces new footage that carries the source clip forward; its interface is scoped to that transformation, keeping source assets and creative intent explicit.
Creative direction. Prompts can describe subject behavior, composition, camera intent, lighting, material, atmosphere, and temporal progression so the result is driven by a shot plan rather than isolated keywords.
Route-specific control. The request exposes duration (Duration in seconds to extend the video. Maximum 20 seconds), allowing the same concept to be tested systematically while preserving a repeatable production setup.
Pipeline-ready output. The generated media asset is returned through the documented asynchronous output contract, which suits review queues, batch iteration, and downstream automation. Editors can review pacing, continuity, lens language, choreography, transitions, temporal artifacts, soundtrack alignment, color response, delivery framing, and cut compatibility before approval.

Pricing

Configuration	Price
Billing rule	`params.duration * 0.10`
duration=1	`$0.100000`
duration=2	`$0.200000`
duration=3	`$0.300000`
duration=4	`$0.400000`
duration=5	`$0.500000`
duration=6	`$0.600000`
duration=7	`$0.700000`
duration=8	`$0.800000`
duration=9	`$0.900000`
duration=10	`$1.000000`
duration=11	`$1.100000`
duration=12	`$1.200000`
duration=13	`$1.300000`
duration=14	`$1.400000`
duration=15	`$1.500000`
duration=16	`$1.600000`
duration=17	`$1.700000`
duration=18	`$1.800000`
duration=19	`$1.900000`
duration=20	`$2.000000`

When to Use

Scenario	Why this model fits
Create the exact route output	Choose it when you need video extension and already have an existing clip plus a continuation brief.
Develop controlled variations	Keep the main brief fixed while changing one documented setting at a time to compare motion, framing, quality, or asset behavior.
Build repeatable batches	Use a consistent request shape for catalog, campaign, storyboard, game-asset, or social-content production.
Preserve source intent	Prefer this route when the supplied reference material must remain the foundation of new footage that carries the source clip forward.
Connect a media pipeline	Use asynchronous results in an automated review, approval, post-production, or asset-management workflow.

Prompt Guide

Start with the desired result, then describe the source relationship, subject action, composition or camera behavior, lighting, style, and timing. For video extension, state what must remain stable as clearly as what should change. Use only fields exposed by the schema; the example below is structurally valid for this route.

{
  "prompt": "Continue the motion smoothly",
  "video": "https://static.sandbase.ai/examples/lightricks/ltx-2.3-pro/extend/input_video_0.mp4",
  "duration": 5
}

Technical Specs

Specification	Value
Model ID	`lightricks/ltx-2.3-pro/extend`
Workflow	Video extension
Required inputs	`prompt`
`video`	`string`
`prompt`	`string`
`duration`	`integer`; minimum: `1`; maximum: `20`