xAI officially launched Voice Cloning through its API, allowing users to clone a custom voice in under 2 minutes or select from 80+ pre-built voices across 28 languages for voice agents, audiobooks, and game characters.
A March 19, 2026 Hacker News post about Kitten TTS reached 512 points and 172 comments at crawl time. KittenML says its 15M, 40M, and 80M ONNX speech models target CPU inference with eight English voices and 24 kHz output.
xAI said on March 16, 2026 that Grok's Text-to-Speech API is now available. xAI's own voice docs describe a beta API with five voices, inline speech tags, telephony-friendly codecs, and a streaming WebSocket mode for low-latency applications.