HeyGen modelsvideo generation api

heygen/heygen/video-agent/v3

Name: HeyGen Video Agent V3
Author: HeyGen

Heygen Video Agent V3 is HeyGen's text-to-video AI model. Turn written scripts and prompts into professional-quality video clips with realistic motion, lighting, and scene composition.

Input

Prompt(string)

Natural language prompt describing the video to generate. The agent handles avatar selection, script, and production automatically.

Idle

Example output — click Run to generate your own

Production endpoint

Send your first request

OpenAI-compatible endpoint with unified authentication and usage tracking.

POSThttps://api.sandbase.ai/v1/run

Model IDheygen/heygen/video-agent/v3

Input Schema

1 parameters · 1 required · 0 optional

Parameter	Type	Required	Description
`prompt`	string	Required	Natural language prompt describing the video to generate. The agent handles avatar selection, script, and production automatically. · Max length: 10000

Output Schema

Field	Type	Description
`id`	string	Unique identifier for the generation task
`status`	string	Task status: pending, running, completed, failed, timeout
`model`	string	Model used for the generation
`outputs`	array	Array of output items
`outputs[].url`	string	URL of the generated artifact
`outputs[].content_type`	string	MIME type (e.g. image/png, video/mp4)
`error`	object \| null	Error details if failed, null on success
`error.type`	string	Machine-readable error type code
`error.message`	string	Human-readable error description

Async Workflow

This model uses asynchronous execution. Submit a request and poll for the result.

Submit — POST to /v1/run, receive an id
Poll — GET /v1/run/{id} until status is completed, failed, or timeout
Retrieve — Read outputs from the completed response

Code Examples

Ready-to-run snippets

# Step 1: Submit
curl -X POST https://api.sandbase.ai/v1/run \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
  "model": "heygen/heygen/video-agent/v3",
  "prompt": "Create a 30-second product demo video showcasing our new AI features with professional lighting and modern graphics."
}'

# Step 2: Poll result (replace <id>)
curl https://api.sandbase.ai/v1/run/<id> \
  -H "Authorization: Bearer YOUR_API_KEY"

← Back to HeyGen Video Agent V3

API README

HeyGen Video Agent V3

heygen/heygen/video-agent/v3 builds a complete presenter-led video from a high-level creative brief, coordinating planning, script, visuals, narration, and assembly. Video Agent V3 improves autonomous storytelling and scene construction, turning an objective into a more coherent finished video with less manual orchestration. This combination makes the model a practical choice when the creative outcome depends on those qualities rather than on a generic media conversion.

For production work with heygen/heygen/video-agent/v3, it is useful for explainers, marketing concepts, educational content, and rapid video production when the desired outcome can be described at the campaign or story level. The result is most reliable when the source material and creative brief clearly describe the intended subject, progression, visual or sonic character, and the qualities that must remain unchanged.

Highlights

Autonomous video planning turns a high-level objective into a structured sequence.

Integrated script development creates narration and scene progression around the brief.

Coherent visual assembly coordinates presenter, supporting imagery, pacing, and transitions.

End-to-end generation reduces manual handoffs from concept through completed video.

Pricing

Billing unit	Price
Per request	Not specified

When to Use

✅ Good fit	❌ Consider alternatives
The model's named workflow matches the source material and intended output	A different input modality or model route is required
A managed asynchronous result is suitable for the production pipeline	A synchronous, interactive editor is essential
The documented controls cover the required duration, framing, or format	The project needs controls outside this endpoint's schema
Creative iteration benefits from a repeatable request structure	Exact deterministic pixels, frames, geometry, or samples are mandatory
A finished downloadable media asset is the desired deliverable	Editable source layers or a native project file are required

Prompt Guide

For generation, state the intended result first, then add the subject or source treatment, progression, style, and delivery constraints. Keep one creative variable per phrase, use the documented field names for controls, and change one setting at a time when comparing results.

{
  "prompt": "Create a 30-second product demo video showcasing our new AI features with professional lighting and modern graphics."
}

Technical Specs

Spec	Value
Model ID	`heygen/heygen/video-agent/v3`
Inputs	prompt
Required inputs	prompt
Output fields	content_type, url
Execution	Async (submit, then poll for result)