Meet xAI TTS
xAI TTS is xAI's text-to-speech model and the default voiceover engine in Advibly. It reads scripts of up to 15,000 characters in five voices, from energetic to authoritative, in 20 language variants or with the language detected for you.
Voiceovers are generated through the Advibly MCP server, so your AI assistant can write a script, voice it and lay it under a video in one conversation.
Available in Advibly
Settings and estimated costs from Advibly's live model configuration.
- Inputs
- Script text
- Voices
- Eve, Ara, Rex, Sal, Leo
- Languages
- 20 language variants plus auto-detect
- Script length
- Up to 15,000 characters
- Estimated cost
- $0.03 / 1,000 charactersOne credit costs $1. The range spans the cheapest and the most expensive settings this model offers; the composer shows the exact amount before you generate.0.03 credits / 1,000 characters
When to use it
Use xAI TTS for narration under product videos and explainers.
- Narration for explainers and product demos
- Localised voiceovers of one script
- Scratch voiceovers while a cut is in progress
Things to keep in mind
Billing is by script length, not audio length.
Available through the MCP server rather than the web composer.
Get more from your prompt
- 1.Write for the ear: short sentences and plain words.
- 2.Spell brand names the way they should sound.
- 3.Pick the voice for the mood: Eve for upbeat, Leo for authority.
- 4.Set the language explicitly for short scripts; detection needs context.
Common questions
What is xAI TTS best used for?
xAI TTS is particularly useful for narration for explainers and product demos, localised voiceovers of one script, scratch voiceovers while a cut is in progress. The right choice still depends on your input assets, delivery format, turnaround and credit budget.
What inputs does xAI TTS support in Advibly?
xAI TTS works from script text. Advibly only shows the controls a model actually supports once it is selected, so you are never offered a combination it cannot render.
How many credits does xAI TTS use?
The current estimate is 0.03 credits / 1,000 characters ($0.03 / 1,000 characters, at $1 per credit). The exact amount follows the options you pick, and Advibly shows it on the generate button before anything is charged.
Reviewed September 29, 2026 against Advibly's model configuration and xAI's published material.
Developer source