Imagine15
3 modes on this page
Imagine15 turns a text prompt into a video clip. Pick a mode, write the prompt, run it in the studio.
Input
FormMode
Prompt*
Image URL*
Resolution
Duration
Result
PreviewMotion preview, not Imagine15 output
$0.08 per second·~90s
What Imagine15 is for
Imagine15 from xAI turns a written prompt into a short video clip. Runtime is about 90 seconds and compute is $0.08 per second. Modes on this page: Image to Video, Reference to Video, and Text to Video. It is a clip generator, not a full training-video editor.
Imagine15 is billed in Knowlify credits at the compute cost ($0.08 per second). A typical run is about 90 seconds. Published rate: Priced per second of output video, by resolution: 480p at $0.08/sec, 720p at $0.14/sec, 1080p at $0.25/sec. A 5-second 480p clip costs $0.40; 720p costs $0.70. Cost scales linearly with duration. No input images or references, so no per-image charges apply.
Pick Imagine15 for text to video at $0.08 per second and ~90s. Compare it with Grok Imagine Image, Grok Imagine Video, Imagine20 on the related cards below if you need a different look, speed, or input type.
How to use Imagine15
- 1. Upload the still Imagine15 should start from, then write the change or motion in Input.
- 2. Run it. The prompt and file hand off to the Knowlify studio, where Imagine15 generates.
- 3. Stay in the studio if you want that frame or clip inside a longer narrated video.
What you need
- A prompt that names the subject, camera move, and lighting.
- A source still (PNG or JPG) for the model to start from.
- Aspect Ratio (16:9, 4:3, 3:2, 1:1, and more).
- Resolution (480p, 720p, 1080p).
Example prompt
a coral reef seen from below, a swimmer silhouette against the sun, National Geographic still, low angle, weather, no text, no watermark, slow cinematic camera move, natural motion
Frequently asked questions
How do I run Imagine15?
Run Imagine15 on Knowlify at /generate/imagine15. This page has 3 modes in one dropdown. Write the prompt on this page and it opens in the studio, where Imagine15 generates a short clip. The same studio also turns documents into full narrated videos.
Where can I use Imagine15 online?
On Knowlify (xAI's model, knowlify.com/generate/imagine15). You do not need a separate playground. Imagine15 runs in the studio next to document-to-video.
Can I make a longer video with Imagine15?
Imagine15 itself produces a short clip. On Knowlify you can take that output, or skip it and upload a document, and generate a full narrated video with a script you can edit.
What do I need to run Imagine15?
A prompt and a source still. Imagine15 will not invent the starting frame for you on this mode.
How long does Imagine15 take?
Plan on about 90 seconds for a typical run, then whatever queue time the studio has. Video models sit at the high end of that range.
Does Imagine15 have more than one mode?
Yes. This page has 3 modes: Image to Video, Reference to Video, and Text to Video. Switch them in the Mode dropdown instead of opening a new URL.
What does Grok Imagine Video 1.5 Text to Video cost?
Priced per second of output video, by resolution: 480p at $0.08/sec, 720p at $0.14/sec, 1080p at $0.25/sec. A 5-second 480p clip costs $0.40; 720p costs $0.70. Cost scales linearly with duration. No input images or references, so no per-image charges apply. Knowlify charges this as credits, at the compute cost.
What is Grok Imagine Video 1.5 Text to Video best for?
Generate videos from prompts with audio using xAI's Grok Imagine 1.5 Video model. It turns a text prompt into a video clip.
Do I need an account to use Grok Imagine Video 1.5 Text to Video?
Generation happens in the studio, so a free Knowlify account is required. Grok Imagine Video 1.5 Text to Video then runs against your credits.