Google AI Launches Gemini 3.1 Flash TTS: A New Benchmark in Expressive and Controllable AI Voice

Google launched the Gemini 3.1 Flash TTS preview model.

It adds natural-language voice control, native multi-speaker dialogue, and support for 70+ languages.

SynthID watermarking is included to help verify audio provenance.

The model is available through Gemini API, AI Studio, Vertex AI, and Google Vids.