xAI Launches Voice Cloning API with 80+ Voices and 28 Languages

xAI has released Custom Voices and Voice Library, a new API feature that enables developers to create and deploy custom AI voice clones. Starting with a reference audio clip of at least 120 seconds, xAI's model captures not just the speaker's timbre but also their delivery patterns and inflections, producing a voice that sounds and speaks like the original. Developers can also choose from a pre-built library of over 80 voices spanning 28 languages. Each cloned voice receives a unique 8-character alphanumeric ID that works seamlessly across both the Text-to-Speech API ($4.20 per million characters) and the real-time Voice Agent API ($0.05 per minute / $3.00 per hour).

Security is a core differentiator: xAI uses a two-stage verification process requiring the speaker to read a verification phrase in real time, then matches speaker embeddings from both the verification clip and the full recording. This prevents cloning from pre-recorded audio or replicating another person's voice without consent — a critical guardrail as voice cloning misuse grows. The feature, available immediately to API users, targets voice agents, audiobook narration, and video game characters. For Tesla owners using Grok, this signals a maturing infrastructure for personalized, voice-driven AI interactions in the cabin.