xAI Grok TTS - Expressive AI Text-to-Speech

Last updated: May 4, 2026

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xAI Grok TTS brings intelligent, expressive text-to-speech to Scenario - combining 5 distinct voices, 17 languages, and unique delivery control tags that let you shape how every word is spoken.

Introduction

xAI Grok TTS is not a typical text-to-speech engine. Developed by xAI, this model was built with expressive fidelity at its core. Where most TTS tools convert text to speech mechanically, Grok TTS responds to delivery intent: you can embed pauses, whispers, and tonal cues directly into your text using speech tags, and the model will follow them naturally.

Inside Scenario, Grok TTS integrates seamlessly with the platform's asset system. It handles everything from a single sentence to a full narration script (up to 15,000 characters) in a single generation, making it ideal for creators who need high-quality audio without recording sessions.

Parameters and Settings

Parameter

Description

Text

Required. Content up to 15,000 characters. Supports speech tags.

Voice

Choose from: Ara, Eve (Default), Leo, Rex, and Sal. Each has a unique character (e.g., Eve is warm; Leo is authoritative).

Language

Supports 17 languages (Arabic, Chinese, English, French, German, Portuguese, Spanish, etc.).

Sample Rate

Controls resolution from 8 kHz to 48 kHz (Professional quality). Default is 44.1 kHz.

Codec

Output formats: MP3 (streaming), WAV/PCM (editing), or μ-law/A-law (telephony).

Speech Tags: Directorial Control

One of Grok TTS's most distinctive features is its support for in-text delivery tags. These allow you to direct the voice's performance without changing parameters.

  • [pause]: Inserts a natural pause to control rhythm or give weight to a statement.

    • Example: "The results were extraordinary. [pause] No one had expected this."

  • whisper tags: Wraps text in a whispered delivery for dramatic or intimate effect.

    • Example: "She leaned in close and said, 'I know your secret.'"

Pro Tip: These tags work within the natural flow of your text and stack with punctuation. Well-crafted input produces output that sounds "performed" rather than just generated.

Multilingual Support

Grok TTS supports 17 languages with automatic detection enabled by default. For scripts with mixed-language content, proper nouns, or non-Latin scripts (Arabic, Chinese, Bengali, etc.), setting the language explicitly ensures clean phonetic alignment and consistent delivery. This makes it a powerful tool for global localization pipelines.

Conclusion

xAI Grok TTS stands out for the directorial control it offers. By using speech tags, you transform standard TTS into a performance.

Workflow Integration:

  1. Generate: Create narration with Grok TTS.

  2. Back: Use Lyria 3 for music-backed scores.

  3. Clone: Feed output into Tada for voice cloning across other languages.

  4. Visualize: Pair with Scenario’s video generation models for full AI-driven content.