xAI
SpaceXAI: Grok Voice TTS 1.0
x-ai/grok-voice-tts-1.0
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, Rex, Sal, Leo) covering a range of tones. Inline speech tags allow control over pauses, emphasis, pitch, speed, and vocal style. Output is available in MP3, WAV, PCM, μ-law, and A-law formats at sample rates from 8 kHz to 48 kHz, with up to 15,000 characters per request.
/ 1M tokens · Token reference
/ 1M tokens · Token reference
tokens
Speech output · Token reference fields do not establish an output-unit price.
Limits
Context
15,000
tokens
Max output
13,500
90% of the context window
Model facts
Author
xAI
Tokenizer
Grok
Modality
Text -> Speech
Created
May 15, 2026