Supported Models | LTX Documentation

The LTX API offers video generation powered by LTX-2.3 — portrait and landscape up to 4K, cinematic frame rates, and first-to-last frame control. Models are available in Fast and Pro variants.

Featured models

LTX-2.3

Portrait and landscape video up to 4K. Cinematic frame rates (24/48 fps), first-to-last frame control for image-to-video, and sharp detail with accurate prompt handling.

LTX-2

Landscape video up to 4K at 25/50 fps with synchronized audio generation.

Model variants

Fast

Optimized for speed and low cost. Best for rapid prototyping, brainstorming, storyboarding, and quick iteration. Supports longer durations (up to 20s at 1080p/25fps).

Pro

Higher fidelity with better motion stability and visual detail. Best for final renders and commercial-grade output. Required for audio-to-video, retake, and extend endpoints.

Start with Fast to explore compositions quickly, then switch to Pro for the final render.

Endpoint compatibility

Not every endpoint supports every model. Audio-to-video, retake, and extend require a Pro model.

Endpoint	Fast	Pro
text-to-video	✓	✓
image-to-video	✓	✓
audio-to-video	—	✓
retake	—	✓
extend	—	✓

Model support matrix

Resolutions, FPS values, and duration options supported by each model.

LTX-2.3

LTX-2

Model	Resolution	FPS	Duration (seconds)
ltx-2-3-fast	1080p	24, 25	6, 8, 10, 12, 14, 16, 18, 20
	1080p	48, 50	6, 8, 10
	1440p	24, 25, 48, 50	6, 8, 10
	4K	24, 25, 48, 50	6, 8, 10
ltx-2-3-pro	1080p	24, 25, 48, 50	6, 8, 10
	1440p	24, 25, 48, 50	6, 8, 10
	4K	24, 25, 48, 50	6, 8, 10

Aspect ratios: 16:9 (landscape) and 9:16 (portrait).

Resolution	16:9 (landscape)	9:16 (portrait)
1080p	`1920x1080`	`1080x1920`
1440p	`2560x1440`	`1440x2560`
4K	`3840x2160`	`2160x3840`

Pricing

For per-second pricing by model and resolution, see the Pricing page.