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HeyGen: Avatar IV

heygen/avatar-iv

HeyGen: Avatar IV is an image-to-video model that animates a single photo into an expressive, lip-synced talking-head video. Rather than only matching mouth shapes to words, it interprets the vocal tone, rhythm, and emotion of the audio to drive head motion, facial expression, and gestures, producing output at up to 1080p.

The spoken audio comes from one of two inputs: a text script, which the model voices with HeyGen text-to-speech, or a supplied audio track, which the image is lip-synced to directly. Passthrough parameters let you choose a voice, tune voice settings, set expressiveness, prompt specific motion, replace or remove the background, add captions, and title the video.

Modalities
Price
$0.05/second
Released
Aug 24, 2026

Playground

Providers

This model is hosted by one provider. OpenRouter forwards every request without routing.

Performance

Generation time is how long a video takes from submission to completion (lower is better). Speed is seconds of video generated per minute of generation time (higher is better).

End-to-end latency
70.46s

P50, best provider

Speed
3.4s/min

P50, best across providers

Uptime

Uptime is the percentage of the past 3 days that at least one provider was responding to requests. Availability is the percentage of time that inference was successfully served. OpenRouter continuously monitors and uses the next-best provider when one returns an error.

Uptime (3d)The model was reachable. Request routed to a provider.
100.00%
Availability (3d)The model returned inference from any provider. Errors and empty responses count against it.
99.38%

Availability over the last 3 days

Last 72 hours
Availability 99.38%
3 Days Ago2 Days AgoYesterdayNow

Availability over the last 24 hours

OpenRouter Availability
99.66%

When an error occurs in an upstream provider, we can recover by routing to another healthy provider, if your request filters allow it. You can access per-provider uptime data programmatically through the Endpoints API. Learn more about our load balancing and provider routing options.

Apps

Public apps that send the most traffic to this model. Good signal for what real production workloads look like — and a hint at which use cases this model is best suited for.

1.
Favicon for https://grok.bot/
Idea Grok Bot
new
0tokens
2.
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fv avatar
new
0tokens
3.
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PauloBot
new
0tokens
4.
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TestHelden Video-Pipeline
new
0tokens
5.
Favicon for https://www.kiritts.com/
KiriTTS
new
0tokens

No chart data available

Activity

Token volume and request traffic to this model over time.

API

Drop-in code to call this model. OpenRouter's API is OpenAI-compatible — most SDKs work by just swapping the base URL. The only thing that changes between models is the model slug below.

Not currently available through EU in-region routing. In-region routing docs

Frequently asked questions

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