Gemini 3.1 Flash TTS

Gemini 3.1 Flash TTS Google released Gemini 3.1 Flash TTS today, a new text-to-speech model that can be directed using prompts. It's presented via the standard Gemini API using gemini-3.1-flash-tts-preview as the model ID, but can only output audio files. The prompting guide is surprising, to say the least. Here's their example prompt to generate just a few short sentences of audio: # AUDIO PROFILE: Jaz R. ## "The Morning Hype" ## THE SCENE: The London Studio It is PM in a glass-walled studio overlooking the moonlit London skyline, but inside, it is blindingly bright.