Gemini 3.8 TTS: custom voice creation and 100+ language synthesis

Google DeepMind

Audio official 1 src. ~1 min

Google released Gemini 3.8 Flash TTS and Flash-Lite TTS (Sep 23), its most expressive audio generation models so far: custom voices built from scratch, voice replication from short samples, and line-by-line performance direction across 100+ languages. Safeguards include consent verification, SynthID watermarking, and C2PA credentials.

Why it matters

Frontier TTS with consent and provenance safeguards shipping to the public Gemini API.

Importance: 3/5

Notable major-version release in Google's flagship audio line

gemini tts voice synthid api

Sources

official Gemini 3.8 text-to-speech says hello