> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ekly.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# LTX Video 2.3 Fast

> Speed-optimized LTX-2.3 (~30x faster) for quick text-to-video and image-to-video with start/end frame control and native audio.

Speed-optimized LTX-2.3 (\~30x faster) for quick text-to-video and image-to-video with start/end frame control and native audio. Up to 4K, up to 20s (clips over 10s render at 1080p).

| | |
| - | - |
| Model id | `ltx-2.3-fast-fal` |
| Media | video |
| Submit to | `POST /v1/videos` |
| Price | 3.3 credits per\_second before discounts |
| Typical time | about 30.0 s |

## Request

**Required:** `prompt`\
**Optional:** `aspect_ratio`, `duration_seconds`, `quality`, `reference_images`

```json theme={null}
{
  "model": "ltx-2.3-fast-fal",
  "prompt": "Wide tracking shot past buffet tables, warm night wedding light, shallow depth, photoreal, no faces sharp in frame. No text.",
  "aspect_ratio": "auto",
  "duration_seconds": 6,
  "quality": "1080p"
}
```

| Field | Allowed | Default |
| - | - | - |
| `aspect_ratio` | `auto`, `16:9`, `9:16` | `"auto"` |
| `duration_seconds` | `6`, `8`, `10`, `12`, `14`, `16`, `18`, `20` | `6` |
| `quality` | `1080p`, `1440p`, `2160p` | `"1080p"` |
| `reference_images` | asset id (up to 1) | |

Reference inputs take asset ids from [`POST /v1/uploads`](/uploads) or an earlier output's `asset_id`.
Prices and allowed values come from the live catalog; `GET /v1/models/ltx-2.3-fast-fal` is always current.


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