HeyGen Avatar IV animates a single photo into a lip-synced talking video. It reads the voice track for tone and rhythm, then adds matching facial expressions, head movement, and gestures, so the result looks like the person is speaking rather than only moving their mouth. It works with real photos and stylized characters.
$0.025
$0.025
How long a clip takes over every route we serve it from: from the accepted job to the finished video.
Share of requests served without a server error. Client errors (4xx) do not count.
Works with the OpenAI SDK pointed at our base URL. Every parameter is in the API reference.
Length of video generated per day on NagaAI, counted since November 2026.
HeyGen Avatar IV animates a single photo into a lip-synced talking video. It reads the voice track for tone and rhythm, then adds matching facial expressions, head movement, and gestures, so the result looks like the person is speaking rather than only moving their mouth.
On NagaAI, HeyGen Avatar IV costs $0.025 per second. You pay only for what you use, with no subscription.
It takes text, images and audio as input and returns video.
Create an API key, copy the model ID from the top of this page and send requests with the OpenAI SDK pointed at NagaAI. The API section on this page has a ready example.
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