Grok TTS
by xAI
Expressive preset-voice speech with five voices, controllable pacing, language guidance, and MP3 or WAV output. Try Grok TTS on Zo.
Release dateMar 2026
Capabilities and prices
These are the supported request options Zo currently offers. Price rules and free-allowance eligibility are fixed before the request starts.
Generate speech
- Inputs
- Text
- Options
- Voice: ara, eve, leo, rex, salFormat: mp3, wavLanguage: Language codeSpeed: 0.7×–1.5×
- Catalog price
- Text$0.002 per 100 characters ($0.002–$0.16 per request)
How we rate models
- Quality. Three brains is top, one is basic. We anchor the rating on Artificial Analysis Speech Arena — a blind listening leaderboard where people choose which generated voice sounds more natural.
- Fast. Shown when median end-to-end synthesis takes less than half the output audio duration. Not every model qualifies.
- $$$$$$$$$$
- Cost.Single dollar is the cheapest tier (green), four dollars is the priciest (amber) — reserved for premium models that cost well above the rest. Tiers sit on a fixed scale of what a typical request costs, so they're comparable across providers and don't shift as the lineup changes.
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