Talking Head Audio-Driven fal.ai

HeyGen Avatar 4

HeyGen Avatar 4 costs $0.12/s on FairStack · an audio-driven model for Spokesperson video, Explainers, UGC-style avatars. No subscription required. Pay per generation with full REST API access. FairStack applies a transparent 20% margin on infrastructure cost so you always see the real price.

FairStack price

$0.12/s

Platform fee

Flat 20%

Try HeyGen Avatar 4 API Quickstart Last updated 2026-11-10

What is HeyGen Avatar 4?

Key Features

Text-to-speak or audio-driven

Talking styles + captions

Many aspect ratios

What are HeyGen Avatar 4's strengths?

Premium branded avatars

Flexible input (text or audio)

Caption support

What are HeyGen Avatar 4's limitations?

Face-clear photo required

Avatar-only use case

What is HeyGen Avatar 4 best for?

Spokesperson video Explainers UGC-style avatars

How much does HeyGen Avatar 4 cost?

Metric

FairStack

Details

Any settings(default)

$0.12/s

Billed per second, 20% platform fee included.

Billing note

The voice track is priced separately (per 1K characters) unless you upload audio.

Subscription

None

Pay per generation only

How does HeyGen Avatar 4 perform across capabilities?

HeyGen Avatar 4 — premium avatar

motion quality

85%

visual quality

88%

lipsync accuracy

90%

temporal coherence

86%

character consistency

88%

What parameters does HeyGen Avatar 4 support?

Parameter

Type

Default

Details

image_url

string

—

prompt

string (optional)

—

voice

string (optional)

—

audio_url

string (optional)

—

talking_style

enum

stable

Options: stable, expressive

resolution

enum

720p

Options: 360p, 480p, 540p, 720p, 1080p

aspect_ratio

enum

16:9

Options: 16:9, 9:16, 4:5, 5:4, 1:1, auto

caption

boolean (optional)

—

Frequently Asked Questions

How much does HeyGen Avatar 4 cost?

HeyGen Avatar 4 costs $0.12/s on FairStack as of 2026-11-10. This price includes FairStack's transparent 20% margin on infrastructure cost. No subscription or monthly fee — you pay per generation only. Minimum deposit is $1.

What is HeyGen Avatar 4 and what is it best for?

HeyGen Avatar 4 turns a photo with a clear face into a premium talking-avatar video. Provide text for the avatar to speak (with a voice) or supply your own audio for lip-sync. Supports stable/expressive talking styles, captions, backgrounds, 360p–1080p output, and aspect ratios 16:9/9:16/4:5/5:4/1:1. HeyGen Avatar 4 is best for Spokesperson video, Explainers, UGC-style avatars. Available via FairStack's REST API with curl, Python, and Node.js SDKs.

Does HeyGen Avatar 4 have an API?

Yes. HeyGen Avatar 4 is available via FairStack's REST API at api.fairstack.ai. See the API reference at fairstack.ai/docs/api-reference for its endpoint. Works with curl, Python requests, Node.js fetch, and any HTTP client.

How does HeyGen Avatar 4 compare to other talking head models?

HeyGen Avatar 4 excels at Spokesperson video, Explainers, UGC-style avatars. It is an audio-driven model priced at $0.12/s on FairStack. Key strengths: Premium branded avatars, Flexible input (text or audio). Compare all talking head models at fairstack.ai/models.