LTX 2.3 Pro Video Extend

Name: Lightricks LTX 2.3 Pro Video Extend
Price: 0.5 USD
Availability: InStock
Author: Lightricks

lightricks/ltx-2.3-pro/video-extend

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.

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Base price: $0.50USD / run
Execution: async
Model type: video
Input fields: 3

Production route

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Playground

Open playground

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)

220

Duration in seconds to extend the video. Maximum 20 seconds. Range: 2 to 20.

OutputReady

Your output will appear here

Complete the inputs, then click Run.

Model card

Specifications

Pricing

Base price: $0.50 / run

Context & modalities

Input: Schema-defined
Output: video

Capabilities

Chat: Not supported
Vision: Not supported
Reasoning: Not supported
Structured output: Not supported
Function calling: Not supported
Audio input: Not supported

Access

Provider: Lightricks
Model ID: lightricks/ltx-2.3-pro/video-extend
Execution: async
API: Unified Run API
Endpoint: /v1/run

API README

LTX 2.3 Pro Video 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 ?? 5) * 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/video-extend/input_video_0.mp4",
  "duration": 5
}

Technical Specs

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

Related Models

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OpenAI-compatible endpoint with unified authentication and usage tracking.

Production API

Unified Run API endpoint

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

Model ID

lightricks/ltx-2.3-pro/video-extend

# The quoted heredoc keeps Unicode and shell metacharacters unchanged.
result=$(curl --fail-with-body --silent \
  -X POST "https://api.sandbase.ai/v1/run" \
  -H "Authorization: Bearer $SANDBASE_API_KEY" \
  -H "Content-Type: application/json" \
  --data-binary @- <<'SANDBASE_JSON'
{
  "model": "lightricks/ltx-2.3-pro/video-extend",
  "video": "https://static.sandbase.ai/examples/lightricks/ltx-2.3-pro/extend/input_video_0.mp4",
  "prompt": "Continue the motion smoothly",
  "duration": 5
}
SANDBASE_JSON
)
run_id=$(printf '%s' "$result" | jq -r .id)
for attempt in $(seq 1 120); do
  status=$(printf '%s' "$result" | jq -r .status)
  case "$status" in completed|failed|timeout) break ;; esac
  sleep 2
  result=$(curl --fail-with-body --silent \
    -H "Authorization: Bearer $SANDBASE_API_KEY" \
    "https://api.sandbase.ai/v1/run/$run_id")
done
status=$(printf '%s' "$result" | jq -r .status)
[ "$status" = completed ] || { echo "Generation ended: $status" >&2; exit 1; }
printf '%s\n' "$result"

Choose your model

Compare models

All image & video models

Model	Type	Default price	Released
LTX 2.3 Pro Video ExtendThis model `Lightricks`	Video	$0.50 / run	Mar 5, 2026
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LTX 2.3 Pro Image to Video `Lightricks`	Video	$0.48 / run	Mar 5, 2026
LTX 2.3 Pro Text to Video `Lightricks`	Video	$0.48 / run	Mar 5, 2026
LTX 2.3 Pro Retake `Lightricks`	Video	$0.50 / run	Mar 5, 2026

Questions

FAQ

How do I call Lightricks LTX 2.3 Pro Video Extend through SandBase?

Create a SandBase API key, then send requests with the model ID "lightricks/ltx-2.3-pro/video-extend" to Unified Run API (/v1/run) at https://api.sandbase.ai. The request examples on this page show the exact payload.

Do I need a separate Lightricks account?

No. One SandBase API key and balance gives you access to Lightricks LTX 2.3 Pro Video Extend and the other models in the catalog; you do not need to sign up with Lightricks separately.