LTX 2 Text to Video Fast: write the sound into the prompt (6s, 8s, 10s, 4K, 4cr)

LTX 2 Text to Video Fast has native audio. A silent prompt still gets a soundtrack you did not choose.

LTX 2 Text to Video Fast is LTX's fast text-to-video row: "Fast text-to-video generation with LTXV2," no still required, 4K ceiling, 4 credits, audio on. Duration is an even ladder: 6s, 8s, 10s, 12s, 14s, 16s, 18s, 20s. The title's 6 / 8 / 10 are the short end, not the only lengths. Fast is a listed feature. Silent is not.

Fast is not mute

Native audio is on. Four credits is the catalog price for this generate, which is why the row is easy to treat as a disposable silent draft. It is not silent. A picture-only prompt still returns a mix the model chose. Write the room, quote the line, name the hits — or plan to replace the track.

The AI video generator will run it quickly. It will not write the sound clause for you. Dialogue prompting is the same rule on slower families. Here the rule is cheaper to ignore, which is why people ignore it.

6s through 20s, even steps

Pick a length from the ladder. There is no 4s, no 5s, no 7s on this record. Twenty seconds is the ceiling. Do not spend 4 credits on a 20-second wander because Fast made the slider feel free. A 6-second or 8-second beat with a written mix is the default. Climb when the action actually needs the extra even seconds.

Quality settings listed are 1080p, 1440p, and 2160p — that last one is the 4K tier. Motion level listed is Medium only. Styles listed are Cinematic, Documentary, and Abstract. Frame rates listed are 24fps and 30fps. Those are the knobs. They do not include "no audio."

4 credits, 4K, text in

No image is required. This is text-to-video. If the product must match a locked still, leave this row. Four credits at a 4K ceiling is the reason to use LTX 2 Fast for coverage and tests — with a sound clause, not as a mute printer you will score later by accident.

The LTX hub is the rest of the family. This page is only the fast text-to-video row: native audio, 6–20s even, 4K, 4 credits. The text-to-video primer is the on-ramp. Stay here when the job is a cheap, long-enough, audio-on take from text.

Write the mix before you climb the ladder

A useful LTX 2 Fast prompt names the action that fits the length you picked, the camera, and the soundtrack. Medium motion is the only listed motion level — do not prompt a crash pan and then call the row broken. Fast, 4 credits, audio on. Write the sound. Pick 6s, 8s, or 10s unless you can name why 14s or 20s is the shot.

FAQ

If I omit sound, is LTX 2 Fast silent?

No. Native audio is on. A silent prompt still gets a soundtrack you did not choose.

Can I run 4s or 5s on this row?

No. Supported durations start at 6s and step by twos to 20s. Shorter clips are a different model.

Do I need an image?

No. This row does not require an image. A locked still belongs on an image-to-video or reference row.

Is 4 credits only the 1080p price?

The catalog lists 4 credits for this row and a 4K max output resolution. Quality settings list 1080p, 1440p, and 2160p. Fast does not mean silent at any of those.