---
title: HeyGen | Scenario Docs
---

> This page is auto-generated from model configurations. Last updated: 2026-11-09.

This reference lists all available **HeyGen** audio generation models and their parameters. Use these parameter names when calling the [Generation API](/api/postgeneratecustom/index.md).

- [HeyGen Voice](#heygen-voice)
- [HeyGen Voice Turbo](#heygen-voice-turbo)

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## HeyGen Voice

HeyGen Voice text-to-speech — natural speech in 39 languages with 24 library voices or an instant clone from a reference clip.

**Model ID:** `model_heygen-voice`

**Capabilities:** `txt2audio`

**LLM Markdown:** <https://app.scenario.com/api/models/model_heygen-voice/markdown>

| Parameter             | Type   | Required | Default | Min | Max | Allowed Values                                                                                                                                                                                                                                 | Description                                                                                |
| --------------------- | ------ | -------- | ------- | --- | --- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------ |
| `text`                | string | Yes      | -       | -   | -   | -                                                                                                                                                                                                                                              | The text to speak. Max 5,000 characters.                                                   |
| `voice`               | string | No       | `Jonah` | -   | -   | `Jonah`, `Nadine`, `Tabitha`, `Soren`, `Elowen`, `Vincent`, `Jocelyn`, `Marielle`, `Corinne`, `Lucian`, `Kieran`, `Hugh`, `Noelle`, `Bram`, `Ewan`, `Iona`, `Cecily`, `Simon`, `Weston`, `Felicity`, `Gareth`, `Rory`, `Meredith`, `Sabrina`   | HeyGen library voice. Ignored when a reference audio is set.                               |
| `audio`               | file   | No       | -       | -   | -   | -                                                                                                                                                                                                                                              | Recording of a single speaker to clone instead of using a library voice (up to 3 minutes). |
| `language`            | string | No       | -       | -   | -   | \`\`, `ar`, `be`, `bg`, `ca`, `cs`, `da`, `de`, `el`, `en`, `es`, `fa`, `fi`, `fr`, `he`, `hi`, `hr`, `hu`, `id`, `it`, `ja`, `ko`, `mk`, `ms`, `nl`, `pl`, `pt`, `ro`, `ru`, `sk`, `sl`, `sr`, `sv`, `ta`, `th`, `tl`, `tr`, `uk`, `vi`, `zh` | Language of the text. Detected from the text when empty.                                   |
| `expressivenessBoost` | number | No       | `1`     | 0   | 1   | -                                                                                                                                                                                                                                              | How expressive the delivery is.                                                            |

## HeyGen Voice Turbo

HeyGen Voice Turbo — the fast, low-cost HeyGen text-to-speech tier, with 24 library voices or an instant clone from a reference clip in 39 languages.

**Model ID:** `model_heygen-voice-turbo`

**Capabilities:** `txt2audio`

**LLM Markdown:** <https://app.scenario.com/api/models/model_heygen-voice-turbo/markdown>

| Parameter             | Type   | Required | Default | Min | Max | Allowed Values                                                                                                                                                                                                                                 | Description                                                                                |
| --------------------- | ------ | -------- | ------- | --- | --- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------ |
| `text`                | string | Yes      | -       | -   | -   | -                                                                                                                                                                                                                                              | The text to speak. Max 5,000 characters.                                                   |
| `voice`               | string | No       | `Jonah` | -   | -   | `Jonah`, `Nadine`, `Tabitha`, `Soren`, `Elowen`, `Vincent`, `Jocelyn`, `Marielle`, `Corinne`, `Lucian`, `Kieran`, `Hugh`, `Noelle`, `Bram`, `Ewan`, `Iona`, `Cecily`, `Simon`, `Weston`, `Felicity`, `Gareth`, `Rory`, `Meredith`, `Sabrina`   | HeyGen library voice. Ignored when a reference audio is set.                               |
| `audio`               | file   | No       | -       | -   | -   | -                                                                                                                                                                                                                                              | Recording of a single speaker to clone instead of using a library voice (up to 3 minutes). |
| `language`            | string | No       | -       | -   | -   | \`\`, `ar`, `be`, `bg`, `ca`, `cs`, `da`, `de`, `el`, `en`, `es`, `fa`, `fi`, `fr`, `he`, `hi`, `hr`, `hu`, `id`, `it`, `ja`, `ko`, `mk`, `ms`, `nl`, `pl`, `pt`, `ro`, `ru`, `sk`, `sl`, `sr`, `sv`, `ta`, `th`, `tl`, `tr`, `uk`, `vi`, `zh` | Language of the text. Detected from the text when empty.                                   |
| `expressivenessBoost` | number | No       | `1`     | 0   | 1   | -                                                                                                                                                                                                                                              | How expressive the delivery is.                                                            |