Grok Imagine 1.5 Video API

2026年10月18日更新

What is Grok Imagine 1.5 Video?

Grok Imagine 1.5 Video is the official API build of xAI's Grok Imagine 1.5 video model, served on UnificAlly as xai/grok-imagine-1.5-video. Send a prompt alone for text-to-video, one start_image_url to animate a frame, or up to 14 image_urls to guide subject, style and scene. Add an end_image_url to pin the last frame, up to 4 timed keyframes, and up to 3 preset voice_ids for spoken lines. Videos run from 1 to 15 seconds at 480p, 720p, or native 1080p, with sound effects, ambience, and dialogue generated in the same pass.

It is the quality route of the family and the one with the most control. On the Arena image-to-video board it is the highest-ranked xAI video model and sits ahead of every Veo 3.1 variant. For NSFW output, style presets, saved characters or 30 second clips, use Grok Imagine 1.5 Fast Video, the grok.com build of the same model.

Key features of Grok Imagine 1.5 Video

What Grok Imagine 1.5 Video is best for

• Product photo to motion ad

  Pass a packaging or hero shot as the start image and animate it into a short video with matching sound for paid social.

• Multi-reference brand spots

  Lock product, talent and backdrop across up to 14 references, then direct them with the prompt.

• 1080p final cuts

  Deliverables that must hold up at full resolution, rendered natively rather than upscaled.

• Talking-portrait video

  Animate a still portrait into a scene where the subject speaks a line in a chosen preset voice, lip-synced to the motion.

• Shots that must end on a frame

  Use the end frame or keyframes when the edit already knows where the shot has to land.

• Finishing a draft

  Explore direction on 1.5 Lite Video, then re-run the winner here with references and native 1080p.

Grok Imagine 1.5 Video use cases

Start with a clean still and let the prompt say what moves and what it sounds like. A cosmetics brand can pass a packaging shot and get a slow orbit with the product locked in frame and a soft ambient bed; a studio can animate a glass render so surfaces ripple and refract. With references instead of a start frame, the same brand can lock the product, a presenter and a location separately and let the prompt choreograph them, with a preset voice reading the line.

A practical split is to draft on Grok Imagine 1.5 Lite Video and finish here. Lite is the cheapest Grok video and takes the same prompts; once a direction is right, add references, an end frame and 1080p here for the final version, then continue it by URL with Grok Imagine 1.0 Video Extend if the cut needs more seconds.

Grok Imagine 1.5 Video limitations

It runs on xAI's API, so it is safe-for-work only, with no style presets and no saved characters, props or locations; those are on the Fast build. A start image and reference images are mutually exclusive. Reference-to-video renders at up to 720p; 1080p needs a prompt or a single start image. Clips cap at 15 seconds per request. Negative prompts are ignored, so describe what you want rather than what to avoid. The task-ID based Extend and Upscale do not accept tasks from this route; use the URL-based 1.0 Video Extend instead.

Grok Imagine 1.5 Video vs Grok Imagine 1.5 Fast Video

Both run Grok Imagine 1.5. This is the official API build; Fast is the grok.com build of the same model. Both generate sound in the same pass.

Pick this route for control and native 1080p. Pick Fast for NSFW, presets, characters, 30 second clips, or when you want to extend and upscale by task ID.

Grok Imagine 1.5 Video API examples

Call Grok Imagine 1.5 Video from any language by POSTing to /v1/tasks. Full parameter docs live at docs.unifically.com/models/video/xai/grok-imagine-1.5-video.

Image-to-video at 1080p with an end frame:

curl -X POST https://api.unifically.com/v1/tasks \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "xai/grok-imagine-1.5-video",
    "input": {
      "start_image_url": "https://files.unifically.com/your-start-frame.jpg",
      "end_image_url": "https://files.unifically.com/your-end-frame.jpg",
      "prompt": "Camera slowly zooms in while clouds drift across the sky. AUDIO: soft wind, distant birds",
      "duration": 10,
      "resolution": "1080p"
    }
  }'

Text-to-video with references and a preset voice:

curl -X POST https://api.unifically.com/v1/tasks \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "xai/grok-imagine-1.5-video",
    "input": {
      "prompt": "The presenter holds up the bottle and says: this is the one. Studio lighting, slow dolly in.",
      "image_urls": [
        "https://files.unifically.com/your-presenter.jpg",
        "https://files.unifically.com/your-product.jpg"
      ],
      "voice_ids": ["ara"],
      "aspect_ratio": "16:9",
      "duration": 8,
      "resolution": "720p"
    }
  }'

Successful submission returns a task_id. Poll GET /v1/tasks/<task_id> or set a callback_url on the request to receive the finished video URL.

Grok Imagine 1.5 Videoのガイドと比較

このモデルを実行する前に、料金、制限、テスト済みの出力をご確認ください。

Grok Imagine 1.5 Video API pricing

Grok Imagine API pricing from $0.01 per image on UnificAlly, plus video cost per second. Compare every route, common jobs, and the right model ID.

Grok Imagine 1.5 Video API pricingを読む→