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

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

Our newest audio model introduces granular audio tags that give you precise control to direct AI speech for expressive audio generation.

Gemini 3.1 Flash TTS is here, giving you improved AI speech quality and control. You can now use audio tags to adjust vocal style and pacing in over 70 languages. Test it out in Google AI Studio, Vertex AI, and Google Vids, and know that all audio is watermarked with SynthID to prevent misinformation.

Gemini 3.1 Flash TTS is a new AI that makes computer speech sound more real. It lets people change how the AI talks by using special commands in the text. This AI can speak in over 70 languages and adds a hidden watermark to the audio. This helps people know it's AI-generated and not a real person.

Today, we’re introducing Gemini 3.1 Flash TTS, the latest text-to-speech model that delivers improved controllability, expressivity and quality — empowering developers, enterprises and everyday users to build the next generation of AI-speech applications.

We’ve improved the overall speech quality of Gemini 3.1 Flash TTS, making it our most natural and expressive model to date. On the Artificial Analysis TTS leaderboard, a benchmark that captures thousands of blind human preferences, 3.1 Flash TTS achieved an impressive Elo score of 1,211.

1 Flash TTS within its “ most attractive quadrant ” for its ideal blend of high-quality speech generation and low cost. The model stands out further with native multi-speaker dialogue, support for 70+ languages, and granular creative control via natural language.


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