Gemini 3.8 Flash TTS Google's flagship creative text-to-speech model for studio-grade voice fidelity, expressive acting, authentic regional accents, and long-form stability. It supports generative voice design from natural-language prompts, over 2,000 production voices, 100+ languages and dialects, voice replication from 30-second samples, line-by-line performance direction, and SynthID watermarking.