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Identifier

Use the model identifier veo-3.1-extend in the model field when calling /asset/start.

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Capabilities

PropertyValue
Reference inputs1
Input typesvideo
Aspect ratios16:9, 9:16 (default 9:16)
Resolutions720p (default 720p)
Durations (seconds)7 (default 7)
Audioyes
Tagsextend

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Inputs

This model takes named media inputs. Pass each one as a top-level field in the request body (not inside references). Each field accepts exactly one of url, asset_id, or avatar_id.
FieldTypeRequiredDescription
source_videovideoyesVideo to extend. Must be a previously generated Hoox video (pass its asset ID via asset_id).
  • url — a direct, publicly accessible file URL
  • asset_id — the ID of an existing asset in your Hoox space (e.g. a previous generation)
  • avatar_id — the ID of an avatar defined in your Hoox space

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Custom settings

These keys go inside the model_settings object of the request body.
KeyTypeDefaultAffects cost
generateAudiobooleantrueyes

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Pricing

Default parameters (7s at 720p): ~28 credits / generation. For exact pricing with your own parameters, call /asset/pricing with the model and any parameters that affect cost.

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Example request

{
  "type": "video",
  "model": "veo-3.1-extend",
  "prompt": "Describe what you want to generate",
  "source_video": {
    "url": "https://example.com/reference.mp4"
  },
  "aspect_ratio": "9:16",
  "resolution": "720p",
  "duration": 7
}
See /asset/start for the full request/response reference, error codes, and code samples in cURL / Python / JavaScript.