LTX 2 19B

What this model is for

Use this page after trying LTX 2 19B in the APIXO playground. It shows the model ID, request body, result format, and the shared async workflow links you need for API integration.

Model ID, endpoint, and auth

Model ID: ltx-2-19b
Base URL: https://api.apixo.ai/api/v1

Method	Endpoint	Description
POST	`/api/v1/generateTask/ltx-2-19b`	Create generation task
GET	`/api/v1/statusTask/ltx-2-19b`	Query task status

Authentication

All requests require an API Key in the header:

Authorization: Bearer YOUR_API_KEY

Request Body

{
  "request_type": "async",
  "callback_url": "https://...",
  "provider": "auto",
  "input": {
    "mode": "text-to-video",
    "prompt": "...",
    "resolution": "1080p",
    "duration": 10,
    "aspect_ratio": "16:9",
    "image_urls": ["..."],
    "seed": 12345,
    "loras": [
      {"path": "...", "scale": 1.2}
    ]
  }
}

Parameters

request_type

string

default:"async"

async (polling) or callback (webhook)

callback_url

string

Callback URL, required when request_type=callback (conditional)

provider

string

default:"auto"

Routing strategy: auto, value, or official

input

object

required

Model input parameters

Show properties

mode

string

default:"text-to-video"

required

text-to-video, image-to-video, text-to-video-LoRA, or image-to-video-LoRA

prompt

string

required

Text description, 1-5000 characters

resolution

string

default:"720p"

required

Video resolution: 480p, 720p, or 1080p

duration

integer

default:"10"

required

Video duration in seconds: 5-20

image_urls

string[]

Reference image, 1 only (required for -image-to-video modes) (conditional)

aspect_ratio

string

default:"16:9"

16:9 or 9:16 (for -text-to-video modes only)

seed

integer

Random seed, 1-2147483647, for reproducibility

loras

array

LoRA models array (for *-LoRA modes only), max 3

Mode Options:

text-to-video — Generate video from text
image-to-video — Generate video from image
text-to-video-LoRA — Text-to-video with LoRA
image-to-video-LoRA — Image-to-video with LoRA

Copy-paste quickstart

Text-to-Video

curl -X POST "https://api.apixo.ai/api/v1/generateTask/ltx-2-19b" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "request_type": "async",
    "input": {
      "mode": "text-to-video",
      "prompt": "a futuristic city with flying cars at sunset",
      "resolution": "1080p",
      "duration": 10,
      "aspect_ratio": "16:9",
      "seed": 54248617
    }
  }'

Image-to-Video with LoRA

curl -X POST "https://api.apixo.ai/api/v1/generateTask/ltx-2-19b" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "request_type": "callback",
    "callback_url": "https://your-server.com/callback",
    "provider": "official",
    "input": {
      "mode": "image-to-video-LoRA",
      "prompt": "make it cinematic with slow pan and dramatic lighting",
      "resolution": "720p",
      "duration": 8,
      "image_urls": ["https://example.com/ref.jpg"],
      "loras": [
        {
          "path": "https://huggingface.co/username/model.safetensors?download=true",
          "scale": 1.2
        }
      ]
    }
  }'

Text-to-Video with Multiple LoRAs

curl -X POST "https://api.apixo.ai/api/v1/generateTask/ltx-2-19b" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "request_type": "async",
    "input": {
      "mode": "text-to-video-LoRA",
      "prompt": "anime style magical girl transformation sequence",
      "resolution": "720p",
      "duration": 12,
      "aspect_ratio": "9:16",
      "loras": [
        {"path": "https://huggingface.co/user1/anime_style.safetensors?download=true", "scale": 1.5},
        {"path": "https://huggingface.co/user2/magic_effects.safetensors?download=true", "scale": 0.8}
      ]
    }
  }'

Response and result format

POST /api/v1/generateTask/ltx-2-19b

Returns taskId on success for subsequent status queries. Success:

{
  "code": 200,
  "message": "success",
  "data": {
    "taskId": "task_12345678"
  }
}

Error:

{
  "code": 400,
  "message": "Insufficient credits",
  "data": null
}

GET /api/v1/statusTask/ltx-2-19b

Query task execution status and results via taskId.

curl -X GET "https://api.apixo.ai/api/v1/statusTask/ltx-2-19b?taskId=task_12345678" \
  -H "Authorization: Bearer YOUR_API_KEY"

Success:

{
  "code": 200,
  "message": "success",
  "data": {
    "taskId": "task_12345678",
    "state": "success",
    "resultJson": "{\"resultUrls\":[\"https://r2.apixo.ai/video.mp4\"]}",
    "createTime": 1767965610929,
    "completeTime": 1767965652317,
    "costTime": 41388
  }
}

Failed:

{
  "code": 200,
  "message": "success",
  "data": {
    "taskId": "task_12345678",
    "state": "failed",
    "failCode": "CONTENT_VIOLATION",
    "failMsg": "Content does not meet safety guidelines"
  }
}

Polling result fields

taskId

string

Unique task identifier.

state

string

Current task state: pending, processing, success, or failed.

resultJson

string

JSON string containing resultUrls array. Only present on success. Parse with JSON.parse().

failCode

string

Error code. Only present when state is failed. See Error Codes.

failMsg

string

Human-readable error message. Only present when state is failed.

createTime

integer

Task creation timestamp (Unix milliseconds).

completeTime

integer

Task completion timestamp (Unix milliseconds).

costTime

integer

Processing duration in milliseconds.

Polling and webhook result retrieval

Use request_type: "async" with the status endpoint when your app wants to poll for completion. Use request_type: "callback" with callback_url when your production service should receive the final result automatically. See Webhooks for delivery details.

Common errors

Code	Description
400	Invalid parameters or request error
401	Invalid or missing API Key
429	Rate limit exceeded

Fail Code	Description
`CONTENT_VIOLATION`	Content violates safety guidelines
`INVALID_IMAGE_URL`	Cannot access provided image URL
`INVALID_LORA_URL`	Cannot download LoRA model

Rate Limits

Limit	Value
Requests	10000 / minute
Concurrent tasks	1000

Exceeding limits returns 429 error. Wait and retry.

Tips

Generation time:
- 480p: ~40-60 seconds
- 720p: ~60-90 seconds
- 1080p: ~90-120 seconds
- LoRA mode adds 10-20 seconds for loading
- Submit task, wait 60 seconds, then poll every 5 seconds
Callback mode: Video generation takes time, strongly recommend using callback mode.
Video expiration: Result URLs are valid for 15 days. Download promptly.
Content moderation: Prompts must comply with content safety guidelines.
LoRA fine-tuning:
- Load custom LoRA models for specific styles or characters
- LoRA URL must be publicly downloadable (HuggingFace, Civitai, etc.)
- URL should include ?download=true or similar download parameters
- Max 3 LoRA models simultaneously
- scale parameter controls LoRA influence, recommended: 0.5-2.0
Resolution selection:
- 480p: Fast generation, for previews
- 720p: Balanced quality and speed
- 1080p: Highest quality, for final output
Duration: Supports flexible 5-20 second duration, billed per second.
Seed reproduction: Same seed + prompt + parameters reproduces identical results.
Image formats: image_urls supports JPG, PNG, WebP, max 10MB per image.
LoRA compatibility: Use video-trained LoRAs; image LoRAs may not work well.

Video generation takes longer than images — use callback mode for production workloads. Result URLs expire after 15 days; download important outputs promptly.

Getting Started

Image Models

Video Models

Audio Models

What this model is for

Model ID, endpoint, and auth

Authentication

Request Body

Parameters

Copy-paste quickstart

Response and result format

POST /api/v1/generateTask/ltx-2-19b

GET /api/v1/statusTask/ltx-2-19b

Polling result fields

Polling and webhook result retrieval

Common errors

Rate Limits

Tips

Getting Started

Image Models

Video Models

Audio Models

Documentation Index

​What this model is for

​Model ID, endpoint, and auth

​Authentication

​Request Body

​Parameters

​Copy-paste quickstart

​Response and result format

​POST /api/v1/generateTask/ltx-2-19b

​GET /api/v1/statusTask/ltx-2-19b

​Polling result fields

​Polling and webhook result retrieval

​Common errors

​Rate Limits

​Tips

​Related links

What this model is for

Model ID, endpoint, and auth

Authentication

Request Body

Parameters

Copy-paste quickstart

Response and result format

POST /api/v1/generateTask/ltx-2-19b

GET /api/v1/statusTask/ltx-2-19b

Polling result fields

Polling and webhook result retrieval

Common errors

Rate Limits

Tips

Related links