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LTX 2.3 Fast

Use LTX 2.3 Fast when you want quick text or image iterations with audio, vertical support, and longer clips before moving your winners to the standard model.

Use Fast for speed and volume, then promote only the winners to LTX 2.3 Pro if the project needs deeper control.

Text→VideoImage→VideoStart + end image6–20s4KAudio
Start generating with LTX 2.3 FastCompare LTX 2.3 Fast vs LTX 2.3 Pro ->

Pay-as-you-go · Price shown before you generate

LTX 2.3 Fast AI video example: A charismatic female racer in a black leather suit stands beside a futuristic motorcycle in a dark neon tu...
Audio on10s
  • Price$0.05/s
  • Duration10s
  • Format16:9
View render →

Best use cases

Rapid concept and hook testingVertical social draftsStart-to-end image transitionsBudget-aware campaign variantsQuick product motion testsStory beats before final polish

Why LTX 2.3 Fast is useful

  • Fast iteration path (Good for testing multiple prompt angles before committing to a premium pass.)
  • Longer clips than many fast engines (You can push from 6 to 20 seconds when the pacing needs more room.)
  • Still includes native audio (Useful for rough timing, mood and social-first sound design.)
  • Clean split versus standard (You know exactly what Fast is for: generate quickly, not extend or retake.)

Real Specs - LTX 2.3 Fast in MaxVideoAI

The limits that shape your renders.
Price / second1080p $0.05/s1440p $0.10/s4k $0.21/s
Text-to-VideoSupported
Image-to-VideoSupported
First/Last frameSupported (start + end image in I2V)
Reference image / style referenceSupported (single start image)
Max resolution4K
Max duration20s
Aspect ratios16:9 / 9:16
FPS options24 fps / 25 fps / 48 fps / 50 fps
Output formatMP4
Audio outputSupported
Native audio generationSupported
Lip syncSupported
Camera / motion controlsPrompt-based only
WatermarkNo (MaxVideoAI)
Fast generate workflowsDetails

Fast is optimized around Text-to-Video and Image-to-Video only. It is the easiest LTX 2.3 entry point when the goal is to test more ideas, faster.

  • Use Text-to-Video for broad ideation.
  • Use Image-to-Video when the first frame or product identity matters.
  • Use 9:16 for social-first variants.
  • Keep the prompt focused on one motion beat.
What Fast does not includeDetails

The product boundary is important for clear UX. Audio-to-Video, Extend and Retake stay on LTX 2.3 Pro so Fast remains simpler and more predictable.

  • No uploaded-audio-driven video mode.
  • No source-video extension workflow.
  • No selective retake workflow.
  • Move up to standard when those controls matter.

LTX 2.3 Fast examples

Local placeholders are used for now on this dev branch. Replace them with final approved LTX 2.3 Fast renders before production launch.

View all LTX 2.3 Fast examples ->

How to Write a Great LTX 2.3 Fast Prompt

Developers guide

LTX 2.3 Fast is a generate-first engine, so keep the prompt short, visual and direct.

Tip: the UI already handles duration, aspect ratio, resolution, fps and the long-duration routing constraint. Focus the prompt on one subject, one move and one mood.

Quick prompt (fastest draft)

Use this for rapid variants and hook testing.

Quick = fastest path to usable drafts.

Template (copy/paste)

[Subject + one action], [camera move], [lighting/style], [optional sound cue], [16:9 or 9:16 vibe].

Example

Handheld smartphone UGC clip of a woman unboxing a new skincare bottle at a kitchen table. She peels the seal, smiles, and turns the bottle toward camera. Soft window daylight, natural colors, subtle room tone + packaging crinkle.

Demo prompt - vertical hook test

LTX 2.3 Fast AI video example: A powerful boxer walks alone through a dark arena tunnel toward the ring, athletic frame wrapped in a hood...
Audio on10s

A powerful boxer walks alone through a dark arena tunnel toward the ring, athletic frame wrapped in a hooded robe, jaw set, shoulders relaxed but dangerous. As he steps forward, a shower of golden sparks rains from above and bright stadium light pours in ahead of him, turning the final moment into a bold silhouette reveal. The camera tracks backward in front of him in one steady move, ending in a dramatic medium-wide shot as he enters the light. Dense haze, warm gold against deep black shadows, sweat catching the light, premium sports-cinema aesthetic, simple, intense, and highly usable for social ads. Crowd roar in the distance, chain rattle, footsteps on concrete, no text, no logos, no watermark.

View render →

Practical strengths and boundaries

What works best

  • Good cost/speed balance for concept exploration, hook testing and aspect-ratio variants.
  • Useful when you want a lighter-weight LTX page without extend/retake complexity.
  • Start/end image support makes it practical for simple transformation cuts and reveal transitions.

Common problems → fast fixes

  • Longer runs look less flexible -> keep >10 second clips only for cases where the extra length is worth the 1080p/25 fps cap.
  • Image-to-Video feels weak -> improve the start image composition before adding more prompt detail.
  • Start-to-end transition feels forced -> make the end image closer to the same visual world.
  • The clip feels too busy -> reduce to one action and one camera move.
  • You need source-video editing -> move to LTX 2.3 Pro instead of overloading Fast.

Hard limits to keep in mind

  • No Audio-to-Video, Extend or Retake on the Fast route.
  • Durations above 10 seconds are constrained to 1080p at 25 fps.
  • Fast is best used for generation, not source-video repair workflows.

Compare LTX 2.3 Fast vs other AI video models

Not sure if LTX 2.3 Fast is the best fit for your shot? These side-by-side comparisons break down the tradeoffs — price per second, resolution, audio, speed, and motion style — so you can pick the right engine fast.

Each page includes real outputs and practical best-use cases.

lightricks

LTX 2.3 Fast vs LTX 2.3 Pro

Use LTX 2.3 Pro on MaxVideoAI for text-to-video, image-to-video, audio-to-video, extend-video and retake-video workflows with Fal’s official 1080p/1440p/4K and 24/25/48/50 fps options.

Compare LTX 2.3 Fast vs LTX 2.3 Pro →

google-veo

LTX 2.3 Fast vs Google Veo 3.1 Fast

Use Veo 3.1 Fast for affordable, fast AI video generation. Up to 8-second clips with optional native audio—ideal for social formats and iterative testing.

Compare LTX 2.3 Fast vs Google Veo 3.1 Fast →

lightricks

LTX 2.3 Fast vs LTX Video 2.0 Fast

Generate fast cinematic AI videos with LTX-2 Fast. Text and image to video with synchronized audio, up to 4K, ideal for rapid iteration and social content.

Compare LTX 2.3 Fast vs LTX Video 2.0 Fast →

Safety and likeness guidance

  • Do not generate sexual content or anything involving minors.
  • Do not impersonate real people or public figures without authorization.
  • Do not upload private or sensitive personal data.
  • Keep prompts brand-safe and rights-cleared when audio is involved.

FAQ

Does LTX 2.3 Fast support Audio-to-Video, Extend or Retake?

No. In the current public Fal routing, Fast covers only text-to-video and image-to-video.

Can LTX 2.3 Fast generate vertical video?

Yes. The standard generate workflows support both 16:9 and 9:16.

What happens above 10 seconds?

Fast can still render up to 20 seconds, but runs above 10 seconds are constrained to 1080p at 25 fps.

When should I move from Fast to LTX 2.3 Pro?

Stay on Fast while testing hooks, pacing and format variants. Move to LTX 2.3 Pro when you need Audio-to-Video, Extend, Retake, or a more complete end-to-end LTX workflow.