Grok Media skill

Grok Media

Use this skill when working with xAI media models in OpenMontage.

Models

• grok-imagine-image for image generation and image editing
• grok-imagine-video for text-to-video, image-to-video, and reference-image video

Authentication

• Env var: XAI_API_KEY
• Base URL: https://api.x.ai/v1
• Header: Authorization: Bearer $XAI_API_KEY

Image API

Text-to-image

• Endpoint: POST /images/generations
• Core fields:
  • model
  • prompt
  • n
  • aspect_ratio
  • resolution

Image edit

• Endpoint: POST /images/edits
• Use image for one source image
• Use images for multi-image compositing
• Each source image can be:
  • a public HTTPS URL
  • a base64 data URI

Image prompting

• Grok responds well to direct natural language
• For edits, describe only the intended change and preserve everything else implicitly
• For multi-image merges, explicitly name how each source contributes
• Prefer one strong scene description over long style-stacking

Video API

Generation

• Endpoint: POST /videos/generations
• Polling endpoint: GET /videos/{request_id}
• Success state: status == "done"
• Failure states to handle explicitly: failed, expired

Modes

• Text-to-video:
  • prompt-only generation
• Image-to-video:
  • use image: {"url": ...}
  • this anchors the starting frame
• Reference-to-video:
  • use reference_images: [{"url": ...}, ...]
  • this influences who/what appears in the video without locking the first frame
  • prompts can reference inputs with placeholders like <IMAGE_1>, <IMAGE_2>

Video constraints

• Grok video is best treated as short-form generation
• Current output resolutions are 480p and 720p
• Reference-image video supports multiple images and is useful for product placement, wardrobe transfer, and identity consistency
• Download outputs promptly; provider URLs may be temporary

Pricing

• grok-imagine-image: $0.02 per generated image
• grok-imagine-image edits/composites: add $0.002 per input image
• grok-imagine-video:
  • 480p: $0.05 per second
  • 720p: $0.07 per second
• grok-imagine-video image-conditioned requests: add $0.002 per input image

Grok-Specific Prompt Guidance

Images

• Start with subject, action, setting
• Add one style anchor, not five
• For edits:
  • describe the desired modification
  • keep the rest of the image stable by omission, not by writing a giant preservation list

Video

• Keep prompts scene-local: one shot, one main motion idea, one emotional beat
• For reference-conditioned video, explicitly map source images to roles:
  • person from <IMAGE_1>
  • jacket from <IMAGE_2>
  • product from <IMAGE_3>
• Camera and pacing language helps:
  • slow push-in
  • handheld follow
  • locked-off medium shot
  • high-energy whip pan transition

Good Fits

• Image style transfer
• Image compositing from multiple sources
• Reference-conditioned short video
• Product-led motion clips
• Character-consistent scenes without hard first-frame lock

Weak Fits

• Long-form clip generation
• Heavy reliance on deterministic seeds
• Overloaded prompts with multiple scene changes

Failure Handling

• If generation submission succeeds but polling expires, surface it as a provider/runtime issue
• If a request fails, preserve the endpoint, mode, and prompt summary in the error
• Do not silently substitute a different provider after xAI was selected without user approval