Veo 3.1 Extend

Google Veo 3.1 Extend – continues an existing clip by up to 8 more seconds. Requires a finished task_id or video_url.

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Videogoogle/veo-3.1-extendSee pricing

Base URL

https://api.zekron.tech/api/v1

Supported modes

extend

Parameters

Pass these inside the input object when creating a task.

Field	Required
task_id	required
prompt	optional
aspect_ratio	optional

task_idrequired

promptoptional

aspect_ratiooptional

Example request

bash

curl -X POST https://api.zekron.tech/api/v1/tasks \
  -H "Authorization: Bearer zk_live_xxx" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "google/veo-3.1-extend",
  "input": {
    "task_id": "zk_task_xxxxxxxxxxxxxxxx",
    "aspect_ratio": "16:9"
  }
}'

Example response

json

{
  "id": "zk_task_8f3a2b1c9d",
  "model": "google/veo-3.1-extend",
  "status": "processing",
  "created_at": "2026-06-10T12:00:00Z"
}

Poll GET https://api.zekron.tech/api/v1/tasks/{id} until status is success or failed.

Pricing

This model is billed at See pricing. You are only charged for successful generations — failed tasks are never billed. Generated outputs are retained for 30 days before they expire.