Grok Imagine Video 1.5 is Here: What's New and How to Choose Parameters

Grok Imagine Video 1.5 Launched: What's Upgraded, How to Choose Parameters

Grok Imagine Video 1.5 is now live on Genvizu, available alongside the original Grok Imagine Video and not replacing it. The new version supports both text-to-video and image-to-video, with options for 1–15 seconds at 480p or 720p. If you prioritize coherent motion, physical realism, and native sound, 1.5 is the version to try first.

What's Upgraded in Grok Imagine Video 1.5

xAI announced on June 16, 2026, that Video 1.5 is officially available. According to the official xAI announcement, this generation's improvements focus on three key areas:

• More Coherent Motion: Less warping and structural drift during sustained shots.

• More Believable Physics: Objects are more likely to maintain consistent weight, inertia, and momentum.

• Tighter Audio-Visual Sync: Environmental sounds, sound effects, and dialogue are generated in sync with the visuals. The official statement claims clearer audio and better synchronization.

It's important to note a detail: the "nearly twice as fast" mentioned in the xAI article refers to Video 1.5 Fast, which is not the standard 1.5 endpoint currently integrated into Genvizu. Therefore, this speed is not a guaranteed output speed for Genvizu.

Text-to-Video or Image-to-Video?

Both use cases are available in Genvizu:

• Text-to-Video: Ideal for quickly testing composition, atmosphere, and camera movement ideas without needing to prepare images first.

• Image-to-Video: Best for characters, products, IP assets, and finalized first frames. The source image locks down the subject and composition.

Kie's 1.5 Preview API documentation marks this endpoint as text-to-video, but it also accepts an optional image URL within the same request. In Genvizu, omitting a reference image defaults to text-to-video; including one switches to image-to-video, eliminating the need to remember API parameters.

Choosing Between 480p, 720p, and Duration

Use CaseRecommended SettingsReasonTest motion & prompts2–4 seconds, 480pQuickly validate direction, reduce trial-and-error creditsVertical social media5–8 seconds, 720pBetter balance of detail and complete motionProduct turntable/subtle3–6 seconds, 720pSingle actions are easier to stabilize for a clean finishFull narrative sequence8–15 secondsRequires clear, sequential action descriptions

Upstream parameters support auto, 1:1, 16:9, 9:16, 3:2, and 2:3 aspect ratios, with resolutions of 480p / 720p and durations from 1–15 seconds. When testing new ideas, start with short 480p durations. Once the motion is satisfactory, upgrade to 720p. This is usually more cost-effective than starting with a full 15-second clip.

Grok Video 1.5 Credit Pricing

Genvizu charges based on actual output duration, with no 6-second minimum billing:

ResolutionCredits per second2 seconds8 seconds15 seconds480p241630720p483260

The original Grok Imagine Video remains available, using its original duration tiers and pricing. 1.5 is a separate model, priced per second as shown in the table above. For a complete comparison with other models, see Genvizu Model Pricing.

How to Write Prompts for Grok Imagine Video 1.5

Start with a simple formula:

[subject and main action] + [camera movement] + [lighting and environment changes] + [sound] + [elements that must stay the same]

Image-to-video example:

The girl slowly turns toward the camera with a slight smile.
The camera slowly pushes in, warm morning light sweeps across her hair from the right, leaves sway gently in the background.
Sound: light breeze, distant birdsong, no music.
Keep the face, school uniform style, and background composition from the reference image unchanged.

Three key points: Assign only one main action per short clip. For camera movement, describe "where to and how to move," not just "cinematic feel." When native sound effects are desired, specify the sound source clearly. To maintain constraints like unchanged faces, product labels, or clothing, add a final sentence to enforce consistency.

Generate a Short Film with Grok Imagine Video 1.5 Now

Start with 2–4 seconds at 480p to validate motion and camera work, then upgrade satisfactory results to 720p: Open the Grok Imagine Video 1.5 model page