SpaceXAI · Voice model

Grok Voice TTS 1.0

x-ai/grok-voice-tts-1.0

Voice

Released May 15, 2026

Grok Voice TTS 1.0 is a text-to-speech model from SpaceXAI. It converts text into spoken audio across 20+ languages with automatic language detection, and offers five built-in voices (Eve, Ara,...

Specifications

Input: text, up to 20,000 characters per call
Output: mp3 (default) or raw pcm
Voice: provider voice ids via `voice`; omitted = the provider's default when it has one
Billing: per character of input text

Use it

POST /api/v1/audio/speech · MCP speak · full reference

curl https://omnirail.org/api/v1/audio/speech \
  -H "Authorization: Bearer $OMNIRAIL_KEY" -H "Content-Type: application/json" \
  -d '{"model":"x-ai/grok-voice-tts-1.0","input":"Hello from OmniRail. Every model, one key.","response_format":"mp3"}' \
  --output hello.mp3