Gemini 3.1 Flash TTS: the next generation of expressive AI speech

Gemini 3.1 Flash TTS is a new text-to-speech model with improved speech quality, controllability, and expressivity. Audio tags enable precise control over vocal style, pace, and delivery using natural language commands. The model supports 70+ languages with native multi-speaker dialogue capability and achieves an Elo score of 1,211 on the Artificial Analysis TTS leaderboard. Developers can use Google AI Studio to configure scene direction, speaker-level specificity, and export parameters as Gemini API code for consistent voice implementation. All generated audio includes SynthID watermarking to detect AI-generated content and prevent misinformation.

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