Remy Reference/models/HeyGen Avatar IV

HeyGen Avatar IV

HeyGen Avatar IV, a lipsync model from WaveSpeed.

lipsyncModelOverride: { model: "heygen-avatar-iv" }

HeyGen·served via

WaveSpeed·Released October 2026

Pricing

List price: $0.10/second
Per generation: $0.00010

Specifications

Context window: 2,000 tokens
Aspect ratios: 5
Released: October 2026
Model string: heygen/avatar-iv

Parameters

Model options, passed in lipsyncModelOverride.config.

Parameter	Type	Default	Range / options
`image`Required Portrait to animate into a talking video.	Image URL	—	—
`audio`Required The speech that drives the video.	Audio URL	—	—
`prompt` Optional directions for expression and movement.	Prompt	—	—
`background` Optional background image.	Image URL	—	—
`expressiveness`	Select	low	lowmediumhigh
`resolution`	Select	1080p	360p480p540p720p1080p

Use this model

await mindstudio.generateLipsync({
  lipsyncModelOverride: {
    model: "heygen-avatar-iv",
    config: {
      image: "...",
      audio: "...",
      background: "...",
      expressiveness: "low",
      resolution: "1080p",
    },
  },
});