Implementation GuidesSupported Models

LTX-2.3

Fast and Pro variants, up to 4K in portrait and landscape

LTX-2.3 comes in two variants: ltx-2-3-fast for speed and low cost, and ltx-2-3-pro for higher fidelity. Both produce portrait and landscape video up to 4K at cinematic frame rates.

Supported endpoints

Audio-to-video, retake, extend, and reframe require ltx-2-3-pro.

Endpointltx-2-3-fastltx-2-3-pro
text-to-video✓✓
image-to-video✓✓
audio-to-video—✓
retake—✓
extend—✓
reframe—✓

Support matrix

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

Duration applies to text-to-video and image-to-video only. For audio-to-video, output length follows your input audio — see maximum input audio length on the API reference.

ModelResolutionFPSDuration (seconds)
ltx-2-3-fast720p24, 256, 8, 10, 12, 14, 16, 18, 20
720p48, 506, 8, 10
1080p24, 256, 8, 10, 12, 14, 16, 18, 20
1080p48, 506, 8, 10
1440p24, 25, 48, 506, 8, 10
4K24, 25, 48, 506, 8, 10
ltx-2-3-pro720p24, 25, 48, 506, 8, 10
1080p24, 25, 48, 506, 8, 10
1440p24, 25, 48, 506, 8, 10
4K24, 25, 48, 506, 8, 10

Resolutions

Resolution16:9 (landscape)9:16 (portrait)
720p1280x720720x1280
1080p1920x10801080x1920
1440p2560x14401440x2560
4K3840x21602160x3840