Official-source specification comparison · no winner declared
MiniMax H3 vs Grok Imagine 1.5
This is not a symmetric feature comparison. H3 is documented as a general multimodal video system; Grok Imagine 1.5 is documented specifically for animating one still image. The defensible head-to-head is therefore image-to-video using the same source frame and motion brief.
Evidence boundary: DualView has not yet run the controlled benchmark described below. Specifications come from official pages. Vendor samples are not matched for prompt, input, settings, selection, or post-processing.
Official showcase material
These are real videos published by the model providers. Watch them as examples of each vendor's presentation, not as evidence that one model beats the other.
MiniMax H3 official showcase
MiniMax-published H3 output preserved without re-encoding.
Open the official sourceGrok Imagine 1.5 official showcase
xAI-published launch-page output preserved without re-encoding.
Open the official sourceWhat the official documentation actually supports
MiniMax positions H3 around unified context across text, images, video, and audio. xAI's 1.5 announcement is deliberately narrower: submit one still, describe motion, camera, pacing, atmosphere, physics, and sound design, then generate a continuation that stays faithful to the source. Comparing every H3 mode against that focused API would reward breadth rather than output quality.
For a fair visual review, lock the input image, prompt text, duration, aspect ratio, and delivery resolution as closely as the APIs allow. Then inspect whether facial features, costume details, typography, lighting direction, and framing survive motion. Camera compliance and source-image fidelity should be scored separately because a model can preserve the frame while ignoring the requested movement, or move correctly while altering the subject.
The official pages differ in maturity and detail. MiniMax states H3 can generate up to 15 seconds at 2K with native stereo sound. The xAI launch article demonstrates a 10-second 720p request and says the preview supported clips up to 720p; current xAI model documentation lists 480p, 720p, and 1080p pricing. Treat those current docs as operational information, not as a retroactive launch claim.
| Question | MiniMax H3 | Grok Imagine 1.5 |
|---|---|---|
| Fair overlapping lane | Image-conditioned video is part of a broader multimodal system | Single-image-to-video is the documented 1.5 task |
| Other documented inputs | Text, image, video, and audio context | One source image plus a text prompt |
| Duration evidence | Up to 15 seconds | Official launch code example uses 10 seconds; the model page does not state a maximum |
| Resolution evidence | Up to 2K | Launch page: up to 720p; current model docs list pricing through 1080p |
| Audio direction | Native stereo sound | Prompt can describe sound design |
| Independent quality result | Not measured by DualView | Not measured by DualView |
Model profiles in one paragraph
MiniMax H3
MiniMax documents up to 15 seconds at 2K, native stereo sound, unified text-image-video-audio context, V2V motion transfer, and multimodal generation and editing.
Grok Imagine 1.5
xAI introduces Grok Imagine 1.5 as an image-to-video model: one still image plus a motion prompt, including camera movement, atmosphere, physics, sound direction, and source-image fidelity.
A fair comparison protocol
The protocol below isolates shared capabilities before exploring model-specific advantages. Save original files and settings so another reviewer can reproduce the result.
Use portrait, product, typography, and wide-environment source frames with licensing recorded.
Ask for the same push-in, orbit, subject action, atmosphere, and synchronized sound event.
Compare at the same resolution first; keep H3's 2K test as a separate delivery-resolution lane.
Score identity retention frame by frame, motion adherence, unwanted reframing, audio fit, and artifacts.
Which one belongs on the shortlist?
Use Grok Imagine 1.5 as a focused candidate when the production starts from a single approved frame. Test H3 when the shot depends on mixed references, V2V motion, native stereo, or 2K delivery. For shared I2V work, neither documentation set replaces a matched output review.
What this page does not claim
This MiniMax H3 and Grok Imagine 1.5 review does not declare an overall quality winner or turn provider preference figures into independent evidence. It leaves undocumented limits blank. Recheck the linked first-party pages because access, aliases, pricing, and output options can change.