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LTX 2.5 Fast Text To Video: Synced AV Drafts to 4K on Models and API | RunComfy

lightricks/ltx-2.5/text-to-video/fast

LTX 2.5 Fast Text To Video generates synced audio-video from a prompt for quick 720p–4K drafts without image or audio references.

Text prompt describing the video scene, motion, and audio.
Video length in seconds. Use auto to let the model choose from the prompt.
Output resolution of the generated video.
Output aspect ratio of the generated video.
Frames per second of the generated video.
Whether to generate synchronized audio with the video.
Optional camera motion preset. Leave unset for prompt-only camera direction.
Idle
The rate is $0.10 per second for 720p, $0.14 per second for 1080p, $0.21 per second for 1440p, and $0.33 per second for 4K (2160p). Native audio is included at every resolution.

Introduction To LTX 2.5 Fast Text To Video

LTX 2.5 Fast Text To Video turns a written prompt into a cinematic clip with optional native audio in a speed-optimized mode for rapid drafts. Choose duration (`auto` or 6–20s), resolution from 720p to 4K, aspect ratio, FPS, and optional camera motion—text only on this page. For developers, LTX 2.5 Fast Text To Video on RunComfy runs in the browser and via an HTTP API, so you don't need to host or scale the model yourself.

Why Choose LTX 2.5 Fast Text To Video#


LTX 2.5 Fast Text To Video turns a written prompt into a synchronized audio-video clip in one pass. It is the speed-optimized text-to-video tier of LTX 2.5—built for rapid drafts and previews before you lock a final. This page is text-only; use the Image-to-Video or Audio-to-Video Fast pages when you have a still or a soundtrack to follow.


AdvantageWhat it means for you
Prompt → AV in one passGenerate picture and native audio together so dialogue, SFX, and ambience land with the shot.
Fast iterationSpeed-focused mode for exploring camera language, lighting, and beats without waiting on a heavyweight render.
Flexible length and resolutionChoose auto duration or 6–20 seconds, and deliver at 720p, 1080p, 1440p, or 4K (2160p).
Optional camera macrosApply dolly, jib, static, or focus-shift presets when you want a prescribed camera path.

Best Use Cases#


  • Concept and draft passes: Explore campaign ideas and shot options quickly from text alone with LTX 2.5 Fast Text To Video.
  • Social media content: Draft 9:16 Shorts or 16:9 web spots with synced sound.
  • Previsualization: Test a camera move, lighting plan, or multi-beat action before production.
  • Batch variants: Generate prompt alternatives for A/B review.

How It Works#


  1. Write the shot: Describe subject, action over time, camera, look, and audio.
  2. Choose delivery: Set duration, resolution, aspect ratio, FPS, audio on/off, and optional camera motion.
  3. Generate and refine: Review motion, faces, lip sync, and sound timing, then change one instruction at a time.

Parameters#


Controls on this LTX 2.5 Fast Text To Video page:


ParameterRequiredTypeDefaultRange / OptionsHow to choose
prompt*Yes (*)StringExample promptUp to 5,000 charactersStructure subject, action, camera, setting, style, and audio.
durationNoStringautoauto, 6, 8, 10, 12, 14, 16, 18, 20Use auto for model-inferred length; fixed seconds when timing is locked.
resolutionNoString1080p720p, 1080p, 1440p, 2160pDraft cheaper at 720p; step up for finals.
aspect_ratioNoString16:916:9, 9:16Match landscape web/ads or vertical social.
fpsNoInteger2524, 25, 48, 50Editorial (24/25) or smoother motion (48/50).
generate_audioNoBooleantruetrue / falseOn for synced sound; off for silent plates.
camera_motionNoString—dolly_in, dolly_out, dolly_left, dolly_right, jib_up, jib_down, static, focus_shiftOptional prescribed camera path.

  • Required field. This page has no image or audio reference inputs.

Pricing#


LTX 2.5 Fast Text To Video is billed per second of generated video. Native audio is included at every resolution.


ResolutionPrice per second6s10s20s
720p$0.10$0.60$1.00$2.00
1080p$0.14$0.84$1.40$2.80
1440p$0.21$1.26$2.10$4.20
4K (2160p)$0.33$1.98$3.30$6.60

For batches, total ≈ duration × per-second rate × output count. When duration is auto, billing follows the actual generated length.


Prompting Tips & Examples#


Reusable structure for LTX 2.5 Fast Text To Video:


[subject + details] + [action over time] + [camera] + [setting + lighting] + [look] + [audio] + [ending]


  • Separate motion: Subject movement vs camera movement.
  • Sequence beats: Use “begins with,” “then,” and “ends on.”
  • Name sound sources: Who speaks, which SFX, what ambience.
  • Limit competing ideas: One main subject and one primary action.

Improved prompt example


> A jazz trio performs in a wood-paneled club: upright bass, brushed drums, and a trumpet player in a midnight-blue suit. Warm tungsten sconces, soft haze, audience silhouettes in the foreground. Slow lateral track left-to-right, then a gentle push-in on the trumpet bell. Analog film grain. Audio: live trumpet, soft brushwork, quiet room murmur.


More LTX 2.5 Pages to Try#


  • LTX 2.5 Fast Image-to-Video: Animate a still when composition or product appearance must stay locked.
  • LTX 2.5 Fast Audio-to-Video: Generate picture timed to a dialogue or music clip.
  • LTX 2 Fast Text-to-Video: Prior-generation Fast text-to-video if you need continuity with older LTX 2 jobs.

Related Models

hailuo-02/pro/text-to-video

Generate sharp HD videos from text with Minimax Hailuo 02 Pro.

minimax-h3-open/image-to-video

Open-weights image-to-video with optional last frame and native stereo audio.

ltx-2/pro/text-to-video

Generate cinematic 4K clips from prompts with audio sync and pro control

happyhorse-1.0/image-to-video

HappyHorse 1.0 I2V on Alibaba animates a still image into native 1080p video with physics-accurate motion and identity-stable subjects.

ltx-2.5/image-to-video/fast

LTX 2.5: animate stills to 4K video with synced audio

seedance-1.0/pro-fast/image-to-video

Create lifelike video motion fast with Seedance Pro for design pros

Frequently Asked Questions

What is LTX 2.5 Fast Text To Video used for?

LTX 2.5 Fast Text To Video turns a written prompt into a synchronized audio-video clip in a speed-optimized mode. It is ideal for concept drafts, social hooks, and camera/lighting previz when you do not have a start image or driving audio bed.

How is LTX 2.5 Fast Text To Video different from the Image-to-Video page?

This page is text-only: there are no image or audio reference inputs. Use LTX 2.5 Fast Text To Video for prompt-first exploration, then switch to Image-to-Video Fast when a still must lock composition or identity.

What output options does LTX 2.5 Fast Text To Video provide?

You can set duration to auto or 6–20 seconds, resolution from 720p to 4K (2160p), aspect ratio 16:9 or 9:16, FPS of 24/25/48/50, optional camera motion presets, and generate_audio on or off.

Does LTX 2.5 Fast Text To Video include native audio?

Yes. When generate_audio is enabled, picture and sound are produced together, and native audio is included in the per-second price at every resolution. Disable audio for silent plates.

What prompt length should I use with LTX 2.5 Fast Text To Video?

Prompts can be up to 5,000 characters. Clear structure—subject, one main action, camera, lighting, style, and audio—usually matters more than filling the limit.

Can developers call LTX 2.5 Fast Text To Video via the RunComfy API?

Yes. Prototype settings in the RunComfy Web UI, then reuse the same LTX 2.5 Fast Text To Video parameters through the HTTP API for batch jobs and product integrations.

How much does LTX 2.5 Fast Text To Video cost on RunComfy?

Billing is per second of generated video: $0.10 at 720p, $0.14 at 1080p, $0.21 at 1440p, and $0.33 at 4K (2160p). Auto duration is charged by the actual generated length. Generations consume USD/credits; new users typically receive a free trial amount.

When should I choose LTX 2.5 Fast Text To Video over slower modes?

Choose LTX 2.5 Fast Text To Video when you need quick previews and prompt iteration. Move to higher-effort pipelines or other models when you need heavier reference control or a locked final look.

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Examples Of LTX 2.5 Fast Text To Video

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