What is xAI Custom Voices?
Custom voices for Grok TTS and voice agents, with consent checks.
Who is xAI Custom Voices best for?
xAI Custom Voices is best for US developers who want their own or their brand's voice in Grok voice agents.
Branded support agents
A cloned voice plugs into the Voice Agent API, so a support bot speaks in one recognizable voice instead of a stock preset.
Creators who narrate a lot
Videos, podcasts and audiobooks can be read in your own voice from a script, without recording each one.
One speaker in many languages
A custom voice keeps multilingual output, so the same voice can read English, Spanish, French, German, Chinese or Japanese.
How much does xAI Custom Voices cost?
xAI Custom Voices adds no charge of its own: you clone up to 30 voices free in the xAI console, then pay the standard Grok voice rates of $15 per million characters for text to speech or $0.08 a minute for voice agents.
- Clone from a clip of up to 120 seconds in the console
- Passphrase and speaker checks confirm the voice is yours
- US only, except Illinois
- $4.80 an hour of conversation
- $0.004 per text input
- No extra charge for custom voices
- No extra charge for custom voices
- REST and WebSocket streaming
- Speech tags and output in several languages
Creating voices through the API is limited to Enterprise plans; other teams create them in the xAI console and use them anywhere by voice ID. Speech to text, which voice apps often pair with this, costs $0.10 an hour through REST or $0.20 an hour streaming. Full pricing on docs.x.ai. We checked these prices on .
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Questions about xAI Custom Voices
What is xAI Custom Voices?
Custom voices for Grok TTS and voice agents, with consent checks.
Who is xAI Custom Voices for?
xAI Custom Voices is best for US developers who want their own or their brand's voice in Grok voice agents.
Is xAI Custom Voices free?
Only the cloning is. Making up to 30 custom voices in the xAI console costs nothing, but using them is billed at the normal rates from prepaid credits: $15 per million characters for text to speech and $0.08 a minute for the Voice Agent.
How much does xAI Custom Voices cost?
xAI Custom Voices's paid plans are Voice Agent (speech to speech) at $0.08 per minute and Text to Speech at $15 per million characters.
Where can I try xAI Custom Voices?
On its official website, x.ai.
Can I clone someone else's voice with xAI Custom Voices?
No. Each xAI custom voice passes two checks: the speaker reads a passphrase that xAI's speech-to-text matches live, then the voice in that clip must match the full recording. You cannot clone from an existing recording, and the feature is only offered in the US, outside Illinois.
How long a recording does xAI Custom Voices need?
An xAI custom voice takes a reference clip of up to 120 seconds. xAI says clips under 30 seconds can lack detail and that 90 to 120 seconds of natural, expressive speech in a quiet room works best; the voice is then ready in under two minutes.
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