LTX Video 2.3 Fast - Ekly API

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

{
  "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 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.