Grok Imagine 1.5 on Genosai — fast 720p video with audio
Grok Imagine 1.5 is xAI's video model, available on Genosai for generation from text and from an image. It outputs clips at 480p and 720p at 24 frames per second with native audio, up to 15 seconds long. The model is known for speed: the Fast mode returns a 6-second clip in about 25 seconds. On Genosai it runs online, with no API setup — generation costs from 12 credits per second.
Updated: July 7, 2026
- Text and image input — The model takes a text prompt, an image or both at once and creates a clip with motion.
- Up to 720p resolution — Generation at 480p and 720p at 24 frames per second — enough for social and drafts.
- Native audio — Dialogue, ambient, effects and music are created in one pass together with the video.
- High speed — The Fast mode returns a 6-second 720p clip in about 25 seconds, handy for sweeping options.
- Seven aspect ratios — Landscape, square and vertical — the clip is assembled straight for the target platform.
Contents
- What is Grok Imagine 1.5
- Capabilities
- Examples
- How to use on Genosai
- Prompts
- Generation cost
- Comparison
- Limitations and tips
- FAQ
What is Grok Imagine 1.5
Grok Imagine 1.5 is xAI's video model, available on Genosai for generation from text and from an image. It is a standalone generation model, not a chatbot: the input is a text prompt, a still image or both at once, and the output is a short clip with synced sound. The model is aimed at a fast and cheap cycle of a short video.
By the numbers, Grok Imagine 1.5 generates at 480p and 720p at 24 frames per second. Clip length is configurable up to 15 seconds, and output is delivered as H.264 MP4 in seven aspect ratios — from landscape to vertical. For image-to-video mode the aspect ratio follows the input image, so an uploaded frame is not cropped unexpectedly.
A standout strength of version 1.5 is speed. The Fast mode returns a 6-second clip at 720p in about 25 seconds, whereas the previous model took 40 seconds and more. Along with the speed-up, version 1.5 added image-to-video at 720p and improved motion physics, so animation of an uploaded frame looks more natural. Audio is created in the same pass as the picture: dialogue, ambient, effects and music arrive together with the video.
On Genosai the model runs online: you do not need a developer account, API keys or your own infrastructure. You open the video studio in the browser, describe a scene or upload a frame — and get a short clip with sound. Grok Imagine 1.5 suits social media specialists, short-video authors and anyone who needs a fast stream of clips at a low price.
Capabilities
Grok Imagine 1.5 gives a fast cycle of a short clip with sound at a low price. Here is what the model does in practice.
Text and image input
The model works as both text-to-video and image-to-video. You can describe a scene in words, upload a frame to animate, or combine both inputs. In image mode the model keeps the composition, subject and style of the source, and motion is set by the prompt.
Resolution and duration
Grok Imagine 1.5 generates at 480p and 720p at 24 frames per second. Clip length is configurable up to 15 seconds, which is enough for a short story or an announcement. Seven aspect ratios let you assemble a clip straight for a landscape, square or vertical platform.
Native audio
Audio is created in one pass together with the video. It is dialogue, ambient, sound effects and background music, synced to the picture. No separate voiceover and track-alignment step is needed, so a short voiced scene can be produced whole in one generation.
Speed
Speed is the calling card of version 1.5. The Fast mode returns a 6-second 720p clip in about 25 seconds, roughly 40 percent faster than the previous model. Because of that it is handy to sweep options: generate several takes, pick the best angle and motion, and not wait long between attempts.
Physics and motion style
Version 1.5 improved motion physics, so animation of an uploaded frame and generation from scratch look more natural in motion. The model holds objects in frame more carefully and builds camera motion more smoothly, which shows on short scenes with people and objects.
Examples
There is no demo gallery for Grok Imagine 1.5 on Genosai yet, so instead of ready clips we describe the typical scenarios the model is built for. The first scenario is a fast sweep of text-to-video options: you describe a scene and, thanks to the model's speed, generate several takes to pick the best angle and motion.
The second scenario is image-to-video: you upload a frame, describe the motion, and the model animates it while keeping the composition and subject. The third scenario is a short voiced scene: a dialogue or line is created together with the video in one pass, with no separate voiceover. The fourth scenario is a vertical clip for social: one of seven aspect ratios assembles the frame straight for the target platform. In all cases the model generates picture and sound together, at 480p or 720p.
How to use on Genosai
Launching Grok Imagine 1.5 on Genosai requires no setup: everything happens in the browser and the model is already connected. The basic path from an idea to a finished clip looks like this.
- Sign in to your Genosai account and open the video studio.
- Pick Grok Imagine 1.5 in the model list.
- Describe the scene in text, or upload a frame for image-to-video.
- Set the resolution up to 720p, the duration up to 15 seconds and the aspect ratio.
- Run the generation and review the short clip with sound.
- Download the clip or refine the prompt and regenerate.
Prompts
These templates show how to phrase tasks for Grok Imagine 1.5. Replace the text in square brackets with your own data and add details on motion, light and sound — the model takes them into account when generating.
Text-to-video: [scene and action], subtle camera move, daylight, short background music, 720p, 8 seconds.Fast sweep: [scene idea], generate several angle and motion options to pick the best.Image-to-video: animate the uploaded frame [description], soft object motion, keep the composition and subject, 720p.Vertical 9:16 clip: [story], dynamic frame, energetic music, a sound accent at the end, 10 seconds.Dialogue scene: [character] delivers [text], lip sync, lively expression, quiet ambient.Product ad: [product] on [background], slow turnaround, clean light, a soft sound effect, 6 seconds.Dynamic scene: [action with motion], natural physics, stable objects in frame, smooth camera.Generation cost
On Genosai the cost of Grok Imagine 1.5 is counted per second of the clip and depends on resolution: about 12 credits per second at 480p and 22 credits at 720p. So a ten-second clip at 720p costs about 220 credits, and at 480p noticeably less. This is one of the most affordable fast models in the catalog, so it is handy for volume and sweeping through ideas.
You pay for actual generations, with no monthly subscription, so the spend is easy to plan for the amount of work. Starter credits after sign-up let you try Grok Imagine 1.5 for free. Current packages and balance are in the Pricing section.
Comparison
Grok Imagine 1.5 is the choice when you need speed, sound and a low price in one short clip. If maximum image-to-video quality at 1080p matters more, look at Hailuo 2.3; another fast and cheap option with sound is Seedance 2 Mini. Expressive motion is covered by Kling 2.5 Turbo, and a multilingual model with sound close in spirit is HappyHorse.
| Model | Strength | Price on Genosai |
|---|---|---|
| Grok Imagine 1.5 | Speed, sound and low price | from 12 credits/sec |
| Hailuo 2.3 | Maximum i2v quality at 1080p | from 45 credits |
| Seedance 2 Mini | Fast and cheap, with sound | from 9.5 credits/sec |
| Kling 2.5 Turbo | Expressive motion | 5 sec=42 credits |
| HappyHorse | Multilingual lip-sync and sound | from 22 credits/sec |
All models are available in one Genosai interface, so you can compare them on your own scene and pick the best by price and quality. A practical approach is Grok Imagine 1.5 for a fast stream and sweeping, and moving the 1080p final to a heavier i2v model.
Limitations and tips
Grok Imagine 1.5 is capped at 720p, so for a 1080p final, dedicated i2v models like Hailuo 2.3 give a sharper picture. Clip length is up to 15 seconds, so do not count on long scenes from one generation. Exact limits and parameters may depend on the studio — rely on the actual result.
Like any video model, Grok Imagine 1.5 is sensitive to prompt detail. Describe the camera motion, light, action and sound: the more specific the input, the more predictable the clip. For talking scenes, state the line itself and keep it short to fit the duration. For image-to-video, upload a sharp frame — the stability of the motion depends on its quality.
Use the model's main advantage — speed: generate several short takes, pick the best by composition and motion, then if needed move the scene to a heavier model for 1080p. That way you save credits and reach the result faster.
FAQ
What is Grok Imagine 1.5 and who built it?
Grok Imagine 1.5 is xAI's video model for generation from text and from an image. It creates short clips with sound at 480p and 720p and is known for high speed and a low price. On Genosai the model is available online with no separate subscription and no API setup.
How much does a Grok Imagine 1.5 clip cost on Genosai?
The price is counted per second of the clip: about 12 credits per second at 480p and 22 at 720p. You pay for actual generations, with no monthly subscription. Current packages are in the Pricing section.
Does Grok Imagine 1.5 generate audio?
Yes. The model creates audio in one pass together with the video — dialogue, ambient, sound effects and background music. No separate voiceover and track-alignment step is needed.
What resolutions and durations does Grok Imagine 1.5 support?
The model generates at 480p and 720p at 24 frames per second, and clip length is configurable up to 15 seconds. Output is H.264 MP4 in seven aspect ratios: landscape, square and vertical.
Does Grok Imagine 1.5 work from an image?
Yes. You upload a frame, describe the motion, and the model animates it while keeping the composition, subject and style of the source. For image-to-video the aspect ratio follows the input image.
How is Grok Imagine 1.5 different from the previous version?
Version 1.5 added image-to-video at 720p and noticeably sped up generation: the Fast mode returns a 6-second clip in about 25 seconds versus 40-plus with the previous model. It also improved motion physics and same-pass synced audio.