--- title: "Grok Imagine Video 1.5: Specs, Audio & Prompt Tips | imaginary.app" description: "Grok Imagine Video 1.5 from xAI: native 1080p text-to-video with built-in sound, how it differs from 1.5 Lite, prompt tips and honest limitations." url: https://www.imaginary.app/models/grok-imagine-video --- Updated November 2026 # Grok Imagine Video 1.5 Grok Imagine Video 1.5 is xAI’s full video model: it turns a text prompt into a short clip with sound, ambience and lip-synced speech generated in the same pass, rendered natively at up to 1080p. It suits expressive, dialogue-led or sound-driven shots more than silent B-roll. Key takeaways - xAI made Grok Imagine Video 1.5 generally available on June 16, 2026, and added text-to-video and native 1080p to the API on July 31, 2026. - Audio is part of the generation: xAI says sound effects, ambience and dialogue are produced together and timed to the on-screen action. - It is the full model in the 1.5 generation. Grok Imagine Video 1.5 Lite is a separate, lighter model that reaches 1080p by upscaling 720p and lacks 1.5’s reference and keyframe features. - On imaginary.app the model runs text-to-video only; the block above lists the durations and resolutions available here. xAI Generate with Grok Imagine Video 1.5 Write a prompt, pick Grok Imagine Video 1.5, choose your settings and see the credit cost before you start. Failed generations return their credits. [Open the generator](https://www.imaginary.app/generate)[View Pricing](https://www.imaginary.app/pricing) Sign in with Google to create an account; buy credits only when you need them. ## On imaginary.app These are the settings our generator offers for Grok Imagine Video 1.5 right now, read from our live model catalog. - Type Video, from a text prompt - Resolutions 480p, 720p, 1080p - Aspect ratios 16:9, 9:16, 1:1 - Clip lengths 5 s, 10 s - Audio Always included - Starting price 3.24 credits (about $0.69–$0.81) at the lowest settings (480p, 16:9, 5 s, sound included) The generator shows the exact credits for your settings before you start. USD ranges depend on which [pack or plan](https://www.imaginary.app/pricing) you bought credits with. If a generation fails, or you cancel it before it starts, its credits go back to your balance. Very rarely, when we can't confirm with the provider whether a generation finished, the credits stay reserved while we check, rather than being charged. Models other than Veo 3.1 need an account that has bought a credit pack or plan, and they have daily usage limits, per account and across the site: if one is reached, the generator tells you and you can try again the next day (limits reset at midnight UTC). ## Sound generated with the picture xAI’s launch post describes 1.5 as generating sound effects, ambience and dialogue in one pass, timed to the action, with clearer and better-synced speech than the previous model. Its docs say generated videos include an audio track by default, with lip-synced speech. fal’s text-to-video endpoint describes the model as generating videos “with audio” and exposes no switch to turn sound off, so expect every clip to come with a soundtrack. ## Native 1080p, not upscaled xAI’s model comparison lists text-to-video on 1.5 at up to 1080p natively. The Lite variant also offers a 1080p option, but xAI states that Lite gets there by upscaling 720p. That matters most for faces, fabric and small background detail. ## Text-to-video starts from an imagined first frame xAI’s overview explains that, for text-to-video, the model renders a first frame from the prompt and then animates it. In practice the opening image is where your prompt has the most control: if the first frame is composed the way you want, the motion that follows tends to stay in that world. xAI also advises describing the shot, including camera movement, lighting and sound. ## Motion and physics were the headline upgrades xAI’s June announcement says 1.5 keeps movement consistent across a clip, with fewer warps and more believable weight and momentum than its predecessor. These are xAI’s own claims, not an independent benchmark, but they point to short, physical, expressive moments as its home ground. ## Grok Imagine Video 1.5 specs from xAI What xAI and its API partners document for the model itself. A maker spec is not always a setting our generator offers: what you can choose on imaginary.app is listed in the block above. | Spec | As documented | Source | | --------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------- | | Maker | xAI | [xAI — Grok Imagine Video 1.5 announcement (June 16, 2026)](https://x.ai/news/grok-imagine-video-1-5) | | Release | Generally available June 16, 2026 (API id grok-imagine-video-1.5) | [xAI — Grok Imagine Video 1.5 announcement (June 16, 2026)](https://x.ai/news/grok-imagine-video-1-5) | | Text-to-video in the API | Added July 31, 2026, together with native 1080p | [xAI — Grok Imagine Video 1.5 references, text-to-video and native 1080p (July 31, 2026)](https://x.ai/news/grok-imagine-video-1-5-references) | | Clip length (xAI API) | 1 to 15 seconds; xAI’s default is 8 seconds | [xAI docs — Video generation](https://docs.x.ai/developers/model-capabilities/video/generation) | | Resolution | 480p, 720p and 1080p; 1080p is native for text-to-video and image-to-video | [xAI docs — Video overview and model comparison](https://docs.x.ai/developers/model-capabilities/video/overview) | | Audio | On by default, with lip-synced speech | [xAI docs — Video generation](https://docs.x.ai/developers/model-capabilities/video/generation) | | Aspect ratios on fal’s endpoint | 16:9, 4:3, 3:2, 1:1, 2:3, 3:4, 9:16 | [fal — Grok Imagine Video 1.5 text-to-video schema (llms.txt)](https://fal.ai/models/xai/grok-imagine-video/v1.5/text-to-video/llms.txt) | | Other modes (xAI API, not offered here) | Image-to-video, reference images (14 in xAI’s docs; the July 31 post says up to seven), up to 3 voice references, first/last frame and up to 4 keyframes | [xAI docs — Video overview and model comparison](https://docs.x.ai/developers/model-capabilities/video/overview) | | Previous model | Classic grok-imagine-video, capped at 720p | [xAI docs — Video overview and model comparison](https://docs.x.ai/developers/model-capabilities/video/overview) | ## Who Grok Imagine Video 1.5 is for ### Good fit - Short scenes where a character speaks a line and the lip movement needs to match. - Clips where sound carries the moment: a door slam, rain on a window, a crowd reacting. - Final 1080p renders after you have settled the idea, where native resolution beats upscaling. - Stylised or energetic moments with clear physical motion, such as a jump, a spill or a sudden turn. ### Look elsewhere if - Silent B-roll you plan to score yourself, since fal’s endpoint offers no way to turn sound off. - Rough drafts where you only need to check composition; the Lite variant is built for simple videos. - Anything that needs a specific real person’s face or a reference image. Reference, voice and keyframe features exist on xAI’s API but are not offered on imaginary.app. ## Prompt tips for Grok Imagine Video 1.5 Describe the opening frame first. The model imagines a first frame from your prompt and then animates it, so lead with subject, setting, framing and light before the action. Example prompt (written by us) ``` A rain-soaked neon alley at night, a delivery rider in a yellow jacket stops under a flickering sign, medium shot at eye level. He looks up as thunder rolls, then pulls his hood over his head and rides off. Sound: heavy rain on metal awnings, distant thunder, the scooter starting. ``` Write sound as its own sentence. xAI generates ambience, effects and dialogue together, so name what we should hear and where it comes from instead of leaving it to chance. For speech, keep the line short and quote it exactly. A single sentence of dialogue gives the lip-sync something it can fit inside a short clip. Example prompt (written by us) ``` Close-up of an elderly fisherman on a wooden pier at sunrise, gulls circling behind him. He squints at the water and says, "She always comes back at high tide." Soft waves lapping, gulls calling, a gentle breeze on the microphone. ``` Name the camera move. xAI’s own guidance is to describe camera movement, lighting and sound; one clear move (slow push-in, handheld follow, locked-off) works better than several in a short clip. Example prompt (written by us) ``` Locked-off wide shot of a kitchen counter, a glass of milk tips over in slow motion and spreads across the marble. Warm morning light from the left. Sound: the glass clinking, liquid splashing, a dog barking once in the next room. ``` ## Limitations - Grok Imagine Video 1.5 is made by xAI; imaginary.app is not affiliated with xAI. - On imaginary.app the model runs text-to-video only. Image-to-video, reference images, voice references, first/last frame and keyframes are xAI API features we don’t offer. - xAI notes that generation is asynchronous and typically takes up to several minutes, and that more detailed scenes need more processing. - Results pass xAI’s moderation; a clip can be filtered or a prompt rejected even when the request is otherwise valid. - Speed, motion and audio claims on this page come from xAI’s own announcements, not from independent tests. ## Related models - [Grok Imagine Video 1.5 Lite](https://www.imaginary.app/models/grok-imagine-video-lite) - [Veo 3.1 Fast](https://www.imaginary.app/models/veo-3-1-fast) - [Kling 3 Pro](https://www.imaginary.app/models/kling-3) - [Wan 3.0](https://www.imaginary.app/models/wan-3-0) - [Every model on imaginary.app](https://www.imaginary.app/models) - [AI video generator overview](https://www.imaginary.app/ai-video-generator) ## Frequently asked questions ### What is the difference between Grok Imagine Video 1.5 and 1.5 Lite? Both belong to xAI’s 1.5 generation and generate audio: xAI documents it for both, and our own test of Lite through fal on November 10, 2026 returned a stereo track. 1.5 renders 1080p natively, while Lite reaches 1080p by upscaling 720p. 1.5 also supports reference images, voice references, first/last frame and keyframes on xAI’s API; Lite supports none of those. xAI recommends Lite for simple videos. ### Does Grok Imagine Video 1.5 have audio? Yes. xAI’s docs say generated videos include an audio track by default, with lip-synced speech, and the launch post says effects, ambience and dialogue are generated together with the picture. fal’s endpoint has no option to turn sound off. ### Is it the same as Grok Imagine Video 1.5 Fast in the Grok app? Not necessarily. xAI’s June 2026 announcement describes Video 1.5 Fast as the version rolled out on grok.com/imagine and the Grok mobile apps, while grok-imagine-video-1.5 is the API model. The model on this page is the API model, served through fal. ### How long does Grok Imagine Video 1.5 take to generate a clip? xAI says generation is asynchronous and typically takes up to several minutes, and that more detailed scenes need more processing. xAI gives no fixed time, so we make no speed claim beyond that. ## Sources Prices, model specs and dates on this page were checked on November 10, 2026. Third-party prices change; check the source before you rely on a number. - [xAI — Grok Imagine Video 1.5 announcement (June 16, 2026)](https://x.ai/news/grok-imagine-video-1-5) - [xAI — Grok Imagine Video 1.5 references, text-to-video and native 1080p (July 31, 2026)](https://x.ai/news/grok-imagine-video-1-5-references) - [xAI docs — Video overview and model comparison](https://docs.x.ai/developers/model-capabilities/video/overview) - [xAI docs — Video generation](https://docs.x.ai/developers/model-capabilities/video/generation) - [xAI docs — grok-imagine-video-1.5 model page](https://docs.x.ai/developers/models/grok-imagine-video-1.5) - [fal — Grok Imagine Video 1.5 text-to-video](https://fal.ai/models/xai/grok-imagine-video/v1.5/text-to-video) - [fal — Grok Imagine Video 1.5 text-to-video schema (llms.txt)](https://fal.ai/models/xai/grok-imagine-video/v1.5/text-to-video/llms.txt) - [imaginary.app pricing](https://www.imaginary.app/pricing) How we checked: model specs come from xAI's and its API partners' pages listed above; the imaginary.app settings and starting price come from our live model catalog. Example prompts are ours, not xAI's. Commercial use: licence and usage terms for Grok Imagine Video 1.5 are set by xAI. Check them, and our [Terms of Service](https://www.imaginary.app/terms-of-service), before you publish what you make. xAI ## Try Grok Imagine Video 1.5 on your own prompt One account and one credit balance for Grok Imagine Video 1.5, Veo 3.1 and every other video model we offer. The price shows before you generate. [Open the generator](https://www.imaginary.app/generate)[View Pricing](https://www.imaginary.app/pricing) Sign in with Google to create an account; buy credits only when you need them.