LTX 2.5 Fast · Text to Video

Generate videos from a text prompt with configurable aspect ratio, duration, resolution, frame rate, and optional synchronized audio. Submit asynchronously, then query the returned task ID for status and results.

Developer API pricing

Provider: Replicate

USD estimate: $0.0037 / credit · Estimated equivalent, not an additional charge.

720p: 9 credits/sec (≈ $0.034/sec)

1080p: 17 credits/sec (≈ $0.064/sec)

2k: 34 credits/sec (≈ $0.13/sec)

4k: 68 credits/sec (≈ $0.25/sec)

Query Task Status

After submitting a task, use the unified query endpoint to check progress and retrieve results:

Get Task DetailsLearn how to query task status and retrieve generation results

Related Resources

Market Overview

Explore all available models

Credits & Billing

View credit balance, plans, and billing activity

Usage

Review API usage and credit consumption

Callbacks

Manage the secret used to verify generation webhook signatures. Callback URLs are supplied when you create each generation.

Webhook flow

Callback URL per generation.

Webhook signing key

Request

POST/v1/generations

AuthorizationSend your API key in the Authorization header using the Bearer scheme.Authorization: Bearer ****************

Header Params

stringrequired

A unique key for this generation request. Reuse the same value only when retrying the identical request body.

max length: 255

Example:: order-20260818-001

Body Params

application/json

stringrequired

The public model ID documented on this page. Use ltx-2-5-fast for this Endpoint.

Allowed:ltx-2-5-fast

Default:: ltx-2-5-fast
Example:: ltx-2-5-fast

stringrequired

The public Endpoint ID for the selected model. Use the Endpoint whose input schema matches this request.

Allowed:text-to-video

Default:: text-to-video
Example:: text-to-video

stringoptional

Optional public Provider ID. Omit this field to use the Endpoint's default Provider.

Allowed:replicate

Default:: replicate
Example:: replicate

objectrequired

Provider-specific input object. Its accepted fields and validation rules depend on the selected provider.

Provider parameters

ReplicatereplicateDefault Provider

stringrequired

Describe the content to generate, including the subject, scene, action, visual style, camera behavior, and other important details.

max length: 10000

Example:: A cinematic city at night

stringoptional

Select the width-to-height ratio of the generated output.

Allowed:16:99:16

Default:: 16:9

numberoptional

Requested output duration in seconds. Choose a value supported by this Provider and Endpoint.

2K/4K resolution supports at most 10 seconds.
48/50 FPS supports at most 10 seconds.

Allowed:234568101214161820min: 2max: 20

Default:: 6

stringoptional

Select the requested output resolution. Higher resolutions may increase processing time and credit usage.

Allowed:720p1080p2k4k

Default:: 1080p

numberoptional

Requested output frame rate in frames per second.

Allowed:24254850

Default:: 25

booleanoptional

Whether to generate synchronized audio for the output video.

Default:: true

string <uri>optional

Optional absolute HTTPS URL that receives terminal generation updates. If omitted, query the task-details endpoint with the returned generation ID.

max length: 2048

Example:: https://client.example.com/webhooks/seeapi

Responses

202Generation accepted and processing

Bodyapplication/json

objectrequired

stringrequired

Example:: task_xxx

stringrequired

Example:: ltx-2-5-fast

stringrequired

Example:: text-to-video

stringrequired

Allowed:replicate

replicate: Replicate

Example:: replicate

stringrequired

Allowed:processing

Example:: processing

numberrequired

Estimated public credits. Values can include up to three decimal places.

Example:: 102

numberrequired

Consumed public credits, with up to three decimal places.

Example:: 0

numberrequired

Refunded public credits, with up to three decimal places.

Example:: 0

string <date-time>required

Example:: 2026-08-18T10:00:00Z

string <date-time>required

Example:: 2026-08-18T10:00:00Z

booleanrequired

Whether this response is an idempotent replay of an earlier request.

Example:: false

200Idempotent replay of an existing generation request

Bodyapplication/json

objectrequired

stringrequired

Example:: task_xxx

stringrequired

Example:: ltx-2-5-fast

stringrequired

Example:: text-to-video

stringrequired

Allowed:replicate

replicate: Replicate

Example:: replicate

stringrequired

Allowed:processing

Example:: processing

numberrequired

Estimated public credits. Values can include up to three decimal places.

Example:: 102

numberrequired

Consumed public credits, with up to three decimal places.

Example:: 0

numberrequired

Refunded public credits, with up to three decimal places.

Example:: 0

string <date-time>required

Example:: 2026-08-18T10:00:00Z

string <date-time>required

Example:: 2026-08-18T10:00:00Z

booleanrequired

Whether this response is an idempotent replay of an earlier request.

Example:: false

400

Invalid JSON, parameters, Schema, or API Policy

401

Invalid API Key or authentication failed

402

Insufficient credits

403

The current request is not allowed

404

Model, Endpoint, or task not found

409

Idempotency conflict or the same request is still being created

413

Request body is too large

429

Too many requests

503

Service temporarily unavailable

Code Examples

Request

const response = await fetch("https://api.seeapi.com/v1/generations", {
  method: "POST",
  headers: {
    "Authorization": "Bearer YOUR_API_KEY",
    "Idempotency-Key": "order-20260818-001",
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
  "model": "ltx-2-5-fast",
  "endpoint": "text-to-video",
  "provider": "replicate",
  "input": {
    "prompt": "A cinematic city at night",
    "aspect_ratio": "16:9",
    "duration_seconds": 6,
    "resolution": "1080p",
    "frame_rate": 25,
    "generate_audio": true
  },
  "callback_url": "https://client.example.com/webhooks/seeapi"
})
});

const result = await response.json();

ResponseHTTP 202

{
  "generation": {
    "id": "task_xxx",
    "model": "ltx-2-5-fast",
    "endpoint": "text-to-video",
    "provider": "replicate",
    "status": "processing",
    "estimated_credits": 102,
    "consumed_credits": 0,
    "refunded_credits": 0,
    "created_at": "2026-08-18T10:00:00Z",
    "updated_at": "2026-08-18T10:00:00Z"
  },
  "idempotent": false
}

const response = await fetch("https://api.seeapi.com/v1/generations", { method: "POST", headers: { "Authorization": "Bearer YOUR_API_KEY", "Idempotency-Key": "order-20260818-001", "Content-Type": "application/json" }, body: JSON.stringify({ "model": "ltx-2-5-fast", "endpoint": "text-to-video", "provider": "replicate", "input": { "prompt": "A cinematic city at night", "aspect_ratio": "16:9", "duration_seconds": 6, "resolution": "1080p", "frame_rate": 25, "generate_audio": true }, "callback_url": "https://client.example.com/webhooks/seeapi" }) }); const result = await response.json();

{ "generation": { "id": "task_xxx", "model": "ltx-2-5-fast", "endpoint": "text-to-video", "provider": "replicate", "status": "processing", "estimated_credits": 102, "consumed_credits": 0, "refunded_credits": 0, "created_at": "2026-08-18T10:00:00Z", "updated_at": "2026-08-18T10:00:00Z" }, "idempotent": false }

Responses

202Generation accepted and processing

Bodyapplication/json

objectrequired

stringrequired

Example:: task_xxx

stringrequired

Example:: ltx-2-5-fast

stringrequired

Example:: text-to-video

stringrequired

Allowed:replicate

replicate: Replicate

Example:: replicate

stringrequired

Allowed:processing

Example:: processing

numberrequired

Estimated public credits. Values can include up to three decimal places.

Example:: 102

numberrequired

Consumed public credits, with up to three decimal places.

Example:: 0

numberrequired

Refunded public credits, with up to three decimal places.

Example:: 0

string <date-time>required

Example:: 2026-08-18T10:00:00Z

string <date-time>required

Example:: 2026-08-18T10:00:00Z

booleanrequired

Whether this response is an idempotent replay of an earlier request.

Example:: false

200Idempotent replay of an existing generation request

Bodyapplication/json

objectrequired

stringrequired

Example:: task_xxx

stringrequired

Example:: ltx-2-5-fast

stringrequired

Example:: text-to-video

stringrequired

Allowed:replicate

replicate: Replicate

Example:: replicate

stringrequired

Allowed:processing

Example:: processing

numberrequired

Estimated public credits. Values can include up to three decimal places.

Example:: 102

numberrequired

Consumed public credits, with up to three decimal places.

Example:: 0

numberrequired

Refunded public credits, with up to three decimal places.

Example:: 0

string <date-time>required

Example:: 2026-08-18T10:00:00Z

string <date-time>required

Example:: 2026-08-18T10:00:00Z

booleanrequired

Whether this response is an idempotent replay of an earlier request.

Example:: false

400

Invalid JSON, parameters, Schema, or API Policy

401

Invalid API Key or authentication failed

402

Insufficient credits

403

The current request is not allowed

404

Model, Endpoint, or task not found

409

Idempotency conflict or the same request is still being created

413

Request body is too large

429

Too many requests

503

Service temporarily unavailable