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What is Grok Imagine 1.5 Lite Video?
Grok Imagine 1.5 Lite Video is the entry tier of xAI's Grok Imagine 1.5 video family, served on UnificAlly as xai/grok-imagine-1.5-lite-video. It generates 1 to 15 second clips from a text prompt alone or from a single start image, with sound generated in the same pass, at the lowest per-second price of any Grok video route.
It is the model to reach for when volume matters more than control: drafts, social cuts, background loops, and anything you would otherwise iterate on ten times before committing. When you need reference images, an end frame, keyframes, or a preset voice, move the same prompt to Grok Imagine 1.5 Video.
Key features of Grok Imagine 1.5 Lite Video
Lowest Grok price per second
Lite is priced well under the other 1.5 builds at every resolution. It is the cheapest way to produce Grok video in bulk, with the per-second rate shown in the playground before each run.
Text-to-video and image-to-video
Send a prompt alone, or a start image with an optional prompt. With a start image the frame decides the aspect ratio; without one you choose from nine ratios, including 21:9 and 5:2.
1 to 15 seconds with sound
Pick any length from 1 to 15 seconds. Sound effects, ambience, and dialogue are generated with the picture; switch audio off for a silent clip.
480p, 720p, and upscaled 1080p
Lite renders at 480p or 720p and upscales to 1080p on request. The 1080p tier costs more per second, so use it for finals rather than drafts.
Same family as 1.5 Video
Prompts written for Lite carry over to Grok Imagine 1.5 Video unchanged when you are ready for references, keyframes, end frames, or voices.
What Grok Imagine 1.5 Lite Video is best for
High-volume drafts
Explore ten directions for the price of one 1.5 Video run, then re-render the winner where it matters.
Social and ad variants
Produce matched 9:16, 1:1, and 16:9 cuts of the same prompt without a start image for each.
Background and ambient loops
Short atmospheric clips for sites, screens, and presentations, where sound and motion matter more than fine control.
Prompt testing before 1.5 Video
Settle the prompt and timing on Lite, then move to 1.5 Video for references and native 1080p.
Grok Imagine 1.5 Lite Video limitations
Lite accepts one start image at most. There are no reference images, no end frame, no keyframes, and no preset voices; sending those fields returns a validation error before anything is charged. Its 1080p is an upscale of the 720p render, not a native 1080p pass. Clips cap at 15 seconds per request; chain Grok Imagine Video Extend by URL for longer sequences. Unknown request fields are rejected rather than ignored.
Grok Imagine 1.5 Lite Video vs 1.5 Video vs 1.5 Fast Video
| 1.5 Lite Video | 1.5 Video | 1.5 Fast Video | |
|---|---|---|---|
| Model key | xai/grok-imagine-1.5-lite-video | xai/grok-imagine-1.5-video | xai/grok-imagine-1.5-fast-video |
| Text-to-video | Yes | Yes | Yes |
| Start image | One | One, plus end frame and keyframes | One |
| Reference images | No | Up to 14 | Up to 7 |
| Preset voices | No | Yes | Yes |
| Duration | 1–15s | 1–15s | 1–30s |
| 1080p | Upscaled from 720p | Native | Yes |
| Price | Lowest | Standard | Standard |
Grok Imagine 1.5 Lite Video API examples
Call Grok Imagine 1.5 Lite Video from any language by POSTing to /v1/tasks. Full parameter docs live at docs.unifically.com/models/video/xai/grok-imagine-1.5-lite-video.
Text-to-video:
curl -X POST https://api.unifically.com/v1/tasks \
-H "Content-Type: application/json" \
-H "Authorization: Bearer YOUR_API_KEY" \
-d '{
"model": "xai/grok-imagine-1.5-lite-video",
"input": {
"prompt": "A paper boat drifting down a rain-soaked street at dusk",
"aspect_ratio": "9:16",
"duration": 6,
"resolution": "480p"
}
}'
Image-to-video, silent:
curl -X POST https://api.unifically.com/v1/tasks \
-H "Content-Type: application/json" \
-H "Authorization: Bearer YOUR_API_KEY" \
-d '{
"model": "xai/grok-imagine-1.5-lite-video",
"input": {
"start_image_url": "https://files.unifically.com/your-start-frame.jpg",
"prompt": "Slow push-in as the candle flickers",
"duration": 6,
"resolution": "720p",
"audio": false
}
}'
Successful submission returns a task_id. Poll GET /v1/tasks/<task_id> or set a callback_url on the request to receive the finished video URL.
FAQ
Grok Imagine 1.5 Lite Video에 대해 자주 묻는 질문
It is the low-cost tier of xAI's Grok Imagine 1.5 video family, model key xai/grok-imagine-1.5-lite-video. It generates 1 to 15 second clips from a text prompt or from a single start image, with sound in the same pass, at a fraction of the per-second price of Grok Imagine 1.5 Video.
Same family, smaller surface. Lite takes a prompt, an optional start image, aspect ratio, duration, resolution, and an audio switch. It does not accept reference images, an end frame, keyframes, or preset voices; those are on xai/grok-imagine-1.5-video. Lite's 1080p is an upscale of its 720p render, while 1.5 Video renders 1080p natively.
480p, 720p, and 1080p, with 1080p produced by upscaling the 720p render. Aspect ratio is auto by default and accepts 1:1, 16:9, 9:16, 4:3, 3:4, 3:2, 2:3, 21:9, and 5:2 for text-to-video; with a start image the frame decides the ratio.
Yes, by default. Sound effects, ambience, and dialogue render in the same pass as the video. Set audio to false for a silent clip.
Per second of output video, with a different per-second rate for 480p, 720p, and 1080p. A 6-second clip at 480p is six times the 480p rate. Current rates are on the pricing page and in the playground before you submit.
Yes, with Grok Imagine Video Extend: pass the finished clip's URL as video_url and it adds 2 to 10 seconds on xAI's API. The task_id input of the same model only accepts Grok Imagine 1.5 Fast Video tasks.
