A lateral tracking shot glides past a row of industrial presses in a cavernous steel mill. A welder's arc erupts in the mid-ground, throwing hard blue-white light and a shower of sparks that arc and die on the concrete floor. Overhead sodium lamps cut hazy orange cones through smoke. Silhouetted workers cross the frame in the foreground. High-contrast mixed color temperature, heavy atmospheric particulate, gritty texture, slow-motion spark trails, hard industrial realism.
LTX-2.5 Fast API
Lightricks LTX-2.5 Fast: real-time speed with audio, 6–20 s, up to native 4K.
from$0.027/ second$0.0310% off
Model IDltx-2.5-fast
Input
Text · Image
Output
Video
Provider
3 providers
Duration (s)
6 · 8 · 10 · 12 · 14 · 16 · 18 · 20
Resolution
720p · 1080p · 1440p · 2160p
Aspect ratio
16:9 · 9:16
Last 7 days · not enough recent requests for stats yet.
LTX-2.5 Fast pricing
Prices are per unit; requests without a provider are routed to the cheapest provider that supports your parameters.
| Option | 720p | 1080p | 1440p | 2160p |
|---|---|---|---|---|
| All options | $0.027 / second 3 Credits | $0.054 / second 6 Credits | $0.108 / second 11 Credits | $0.216 / second 22 Credits |
Try LTX-2.5 Fast before you integrate
Test output quality, compare provider prices and estimate cost before writing any code.
Input
Result
IdleProvider prices for this request
Enter a prompt to compare provider prices.
LTX-2.5 Fast prompt examples
Ready-to-use prompts. Load one into the playground and tweak it.
9 prompts
the giant looks down at the people and the people look up at him. "LTX-2.5" text stays on the screen the whole time. birds chirping in background loudly and dense jungle noises
A lone futuristic detective walks through a rain-soaked megacity at night, surrounded by towering brutalist skyscrapers, enormous holographic advertisements, flying vehicles and endless neon signs. Heavy rain falls through dense volumetric fog, steam rises from underground vents, pedestrians move like silhouettes through the glowing streets. The detective's face is partially illuminated by cyan neon while warm amber light flickers from nearby shops. Wet pavement creates endless reflections. The camera slowly tracks backward as he walks toward the lens, subtle handheld movement, shallow depth of field, anamorphic lens flare, realistic rain on the lens, cinematic chiaroscuro, deep shadows, atmospheric perspective, restrained cyberpunk aesthetic, futuristic film noir, melancholic and mysterious storytelling, photorealistic, premium cinematic VFX, 35mm film grain,
A lone futuristic detective walks through a rain-soaked megacity at night, surrounded by towering brutalist skyscrapers, enormous holographic advertisements, flying vehicles and endless neon signs. Heavy rain falls through dense volumetric fog, steam rises from underground vents, pedestrians move like silhouettes through the glowing streets. The detective's face is partially illuminated by cyan neon while warm amber light flickers from nearby shops. Wet pavement creates endless reflections. The camera slowly tracks backward as he walks toward the lens, subtle handheld movement, shallow depth of field, anamorphic lens flare, realistic rain on the lens, cinematic chiaroscuro, deep shadows, atmospheric perspective, restrained cyberpunk aesthetic, futuristic film noir, melancholic and mysterious storytelling, photorealistic, premium cinematic VFX, 35mm film grain,
A slow lateral tracking shot glides through old-growth pines, following a large brown bear as it moves along a shallow river bank, the camera drifting with it in parallel. Low morning sun cuts sideways through the trunks in hard parallel shafts, backlighting the bear's fur into a bright rim of gold against deep shadow; its breath clouds in the cold air with every step. Suspended mist and pollen turn slowly in the light beams. The bear pauses, lowers its head toward the water, then moves on. Telephoto compression, shallow depth of field, pine trunks sliding through the foreground, high dynamic range, cool green shadows against warm highlights, natural wildlife cinematography, 35mm film grain. Sound: shallow water running over stones, wind high in the pines, wet gravel underfoot, distant birdsong.
Steel mill sparks
IndustrialSideways tracking shot past heavy presses in a steel mill, a welding arc throwing blue-white sparks in slow motion, sodium lamps cutting through smoke, workers passing in silhouette, gritty realism.
LTX-2.5 Fast API reference
Endpoints, request fields and runnable examples for this model.
Base URL
https://01router.com/api/v1Quick start
Set API_KEY to your project key, then run a sample from your server. Replace example media URLs with your own public URLs.
Auto-routing chooses a provider that supports the request. Select a provider to see its input constraints and pinned request examples.
curl https://01router.com/api/v1/generations \
-H "Authorization: Bearer $API_KEY" \
-H "Content-Type: application/json" \
--data-binary @- <<'JSON'
{
"model": "ltx-2.5-fast",
"input": {
"prompt": "A cinematic shot of a red fox running through snow",
"duration": 6,
"resolution": "1080p",
"aspect_ratio": "16:9",
"generate_audio": true
}
}
JSON
# Replace GENERATION_ID with the id returned above; poll until status is "succeeded" or "failed"
curl https://01router.com/api/v1/generations/GENERATION_ID -H "Authorization: Bearer $API_KEY"Endpoints
Only endpoints relevant to this model are listed. Paths below include /api/v1. Click an endpoint to read its usage.
/api/v1/generationsCreate a generation (charges credits) · API key required
/api/v1/generations/{id}Get a generation; polls the provider while running · API key required
/api/v1/generations/{id}/cancelCancel a running generation (credits refunded) · API key required
/api/v1/quotePrice a request on every provider (no charge, no key needed) · Public · no key
/api/v1/models/ltx-2.5-fastGet one model · Public · no key
Authentication
Send your API key as a Bearer token. Requests are billed to the key owner's credits.
Authorization: Bearer YOUR_API_KEY
Content-Type: application/jsonInput
Send JSON with Content-Type: application/json. Model parameters belong inside input; model, provider and callback_url are top-level fields.
Request body
| Name | Type | Required | Description |
|---|---|---|---|
| model | string | Yes | "ltx-2.5-fast" |
| provider | string | No | Pin a provider; omit to auto-route to the cheapest. One of: fal | replicate | atlascloud |
| input | object | Yes | Model parameters, see the input fields below. |
| callback_url | string | No | Optional public HTTPS webhook URL. The final task result is signed and delivered here; polling remains available. |
input · input fields
Required fields are marked explicitly. Other fields use the listed defaults when omitted.
| Name | Type | Required | Values | Default |
|---|---|---|---|---|
| prompt* | string | Yes | — | — |
| image_url Optional start image (image-to-video) | string | No | — | — |
| end_image_url | string | No | — | — |
| duration | number | No | 6 | 8 | 10 | 12 | 14 | 16 | 18 | 20 | 6 |
| resolution | string | No | 720p | 1080p | 1440p | 2160p | 1080p |
| aspect_ratio | string | No | 16:9 | 9:16 | 16:9 |
| generate_audio | boolean | No | — | true |
Output
Creating a task does not mean generation has finished. Keep its id, poll until succeeded or failed, then read outputs or error. Amounts below are illustrative; actual charges depend on the request.
Task submitted
{
"id": "gen_example",
"object": "generation",
"model": "ltx-2.5-fast",
"type": "video",
"provider": "fal",
"status": "processing",
"input": {
"prompt": "A cinematic shot of a red fox running through snow",
"duration": 6,
"resolution": "1080p",
"aspect_ratio": "16:9",
"generate_audio": true
},
"outputs": [],
"error": null,
"credits": 0,
"price_usd": 0,
"created_at": "2026-10-25T08:00:00.000Z",
"completed_at": null
}Task completed
{
"id": "gen_example",
"object": "generation",
"model": "ltx-2.5-fast",
"type": "video",
"provider": "fal",
"status": "succeeded",
"input": {
"prompt": "A cinematic shot of a red fox running through snow",
"duration": 6,
"resolution": "1080p",
"aspect_ratio": "16:9",
"generate_audio": true
},
"outputs": [
"https://example.com/output.mp4"
],
"error": null,
"credits": 0,
"price_usd": 0,
"created_at": "2026-10-25T08:00:00.000Z",
"completed_at": "2026-10-25T08:01:00.000Z"
}Response fields
| Name | Type | Required | Description |
|---|---|---|---|
| id | string | Yes | Generation ID. Use it to query or cancel this task. |
| object | string | Yes | generation |
| model | string | Yes | ltx-2.5-fast |
| type | string | Yes | video |
| provider | string | Yes | Provider |
| status | string | Yes | queued → processing → succeeded / failed. Stop polling at either terminal state. |
| input | object | Yes | Model parameters, see the input fields below. |
| outputs | string[] | Yes | Result URLs. Empty while processing; read after succeeded and save the files promptly. |
| error | string | null | Yes | Failure reason, or null when no failure is reported. |
| credits | number | Yes | Credits charged for this request. |
| price_usd | number | Yes | Request price in USD. |
| created_at | string | Yes | Creation time in ISO 8601 format. |
| completed_at | string | null | Yes | Completion time in ISO 8601 format; null before completion. |
Get the result
Poll every few seconds until status is succeeded or failed. Output URLs are provider-hosted and may expire — download them promptly. Or pass callback_url to get the result pushed.
curl "https://01router.com/api/v1/generations/GENERATION_ID" \
-H "Authorization: Bearer $API_KEY"queued → processing → succeeded / failed. Stop polling at either terminal state. Result URLs. Empty while processing; read after succeeded and save the files promptly.
Cancel a task
Cancellation depends on provider support and task state. A confirmed cancellation returns status: failed and error: Canceled by user. Unsupported or completed tasks return 409 not_cancelable.
curl -X POST "https://01router.com/api/v1/generations/GENERATION_ID/cancel" \
-H "Authorization: Bearer $API_KEY"Quote
Same body as creating a generation. Returns every available provider sorted by price, plus the ones that cannot serve the request and why.
curl "https://01router.com/api/v1/quote" -H "Content-Type: application/json" --data-binary @- <<'JSON'
{
"model": "ltx-2.5-fast",
"input": {
"prompt": "A cinematic shot of a red fox running through snow",
"duration": 6,
"resolution": "1080p",
"aspect_ratio": "16:9",
"generate_audio": true
}
}
JSONModel schema
This public endpoint returns the model parameters and each provider’s supported constraints and prices.
curl "https://01router.com/api/v1/models/ltx-2.5-fast"Errors
Check the HTTP status and error.message. Fix the request before retrying validation or authentication errors. A failed generation is reported in status and error on the task itself.
{
"error": {
"message": "Invalid or missing API key",
"code": "unauthorized"
}
}400Invalid body or parameter value
401Missing or invalid API key
402Not enough credits
404Unknown model or generation
409The task cannot be canceled (already finished, or the provider does not support canceling)
429Too many requests — retry after the given seconds
502Every provider rejected the task (credits refunded)
Use with AI
Give your coding assistant this model reference: endpoints, input constraints, output fields and request examples in plain text.
How does LTX-2.5 Fast compare?
Specs and starting prices side by side. Test with the same prompt before you choose.
| LTX-2.5 Fast | Grok Imagine Video 1.5 | Seedance 2.5 | Grok Imagine Video 1.5 Lite | |
|---|---|---|---|---|
| Vendor | Lightricks | xAI | ByteDance | xAI |
| Starting price | $0.027 / second | $0.011 / second | $0.086 / second | $0.013 / second |
| Input | Text · Image | Text · Image | Text · Image | Text · Image |
| Provider | 3 providers | 10 providers | 9 providers | 6 providers |
| Duration (s) | 6 · 8 · 10 · 12 · 14 · 16 · 18 · 20 | 1 – 15 | 4 – 30 | 1 – 15 |
| Resolution | 720p · 1080p · 1440p · 2160p | 480p · 720p · 1080p | 480p · 720p · 1080p | 480p · 720p · 1080p |
| Aspect ratio | 16:9 · 9:16 | 16:9 · 4:3 · 3:2 · 1:1 · 2:3 · 3:4 · 9:16 | 16:9 · 9:16 · 1:1 · 4:3 · 3:4 · 21:9 | 16:9 · 4:3 · 3:2 · 1:1 · 2:3 · 3:4 · 9:16 |
LTX-2.5 Fast API FAQ
What is LTX-2.5 Fast for?
Lightricks' speed-optimized tier for fast iteration, previews and high-volume work, with resolutions up to 4K and audio included.
Which durations are supported?
6 to 20 seconds in 2-second steps. Clips longer than 10 seconds require 720p or 1080p.
Which resolutions and ratios are supported?
720p, 1080p, 1440p and 2160p (4K), in 16:9 or 9:16 only.
How should I write prompts?
Write one present-tense paragraph, be specific about camera movement and lighting, and use active verbs. Longer, detailed prompts usually work better.
How is it billed on 01router?
Per output second at the chosen resolution, with audio included; see the pricing table. Failed generations are refunded.
Related models
Other models you can call with the same API key.
Grok Imagine Video 1.5
Grok Imagine Video 1.5: 1–15 second videos with synchronized audio, at 480p, 720p or 1080p. Image-to-video follows the source image aspect ratio.
Seedance 2.5
ByteDance’s flagship video model: up to 30 s in one pass, native synchronized audio, first/last-frame control.
Grok Imagine Video 1.5 Lite
Grok Imagine Video 1.5 Lite: 1–15 second videos with synchronized audio, at 480p, 720p or 1080p. Image-to-video follows the source image aspect ratio.
MiniMax H3 Max
MiniMax H3 post-trained by fal for speed: 5–15 s clips with first/last frame, ranked #1 on video arenas.
Seedance 2.0
Multi-shot Seedance generation with synchronized audio and first/last-frame control, 4–15 s.
Seedance 2.0 Mini
Faster, lower-cost Seedance 2.0 for drafts and high-volume generation (480p/720p).