How to prompt Gemini 3.1's new text to speech model

Gemini 3.1 Flash text to speech (TTS) is a new model that you can direct to get the precise audio performance you want. In this blog post I'll share some tips on how to guide the model with prompts, and share some examples of its strengths. Out of the box gemini-3.1-flash-tts-preview will natively interpret a transcript and determine how your words should be delivered. Simple transcripts without any additional prompting sound natural. But 3.1 Flash TTS also comes with tools you can use to steer...