LTX-2.3

Highlights

• Distilled version ltx-2.3-22b-distilled: 8 steps, CFG=1, fast output
• Official fp8 and nvfp4 weights provided, specifically for small VRAM
• Supports image-to-video, text-to-video, first/last frame, and image+audio-to-video (IA2V)
• Official recommendation is to use the built-in LTXVideo nodes in ComfyUI Manager

Scope

• Good for: small VRAM users wanting 22B-class video
• Good for: image-to-video + first/last-frame transitions
• Not for: projects requiring long-duration coherent narrative

Tips

• CFG fixed at 1; increasing it has no effect
• Use the official upscaler for 2× resolution; it saves VRAM compared with directly raising generation resolution
• Write audio prompts as a separate paragraph

Cautions

• Community license; multi-stage workflows double VRAM requirements

Parameters

Distilled version

8 steps, CFG 1

Full version

Multi-step, trainable

Resolution

Mainly 720p class, with spatial upscaler for multi-stage

VAE/upscaling

Official x1.5 / x2 spatial upscalers

Deployment

16GB conclusion

Runs with fp8 or nvfp4 distilled weights; 8 steps is the key to making it viable on small cards.

VRAM note

If weights are still in the 20GB class, offload is still required; keeping duration to 3–5 seconds is most stable.

Suggested starting point

fp8 distilled + 8 steps, first output 720p/3 seconds.

Comparison

Predecessor to 2.5, with 850k downloads and still growing. Its value is that the combination of “distilled 8 steps + fp8/nvfp4” has been thoroughly run by the community, with lower trial-and-error cost than 2.5; new projects can use 2.5 directly.