Gemini 3.1 Flash TTS

BlogApr 19, 2026

Original excerpt

Sponsored by: Honeycomb — AI agents behave unpredictably. Get the context you need to debug what actually happened. Read the blog

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:

It is 10:00 PM in a glass-walled studio overlooking the moonlit London skyline, but inside, it is blindingly bright. The red "ON AIR" tally light is blazing. Jaz is standing up, not…

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