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google / gemini-3-1-flash-tts

Commercial use

Gemini 3.1 Flash TTS Preview is an expressive text-to-speech model by Google that delivers natural AI voice generation with advanced control over tone, emotion, pacing, and speaking style.

Pricing: $1.00 in · $20.00 out
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google/gemini-3-1-flash-tts USD / 1M tokens

Option / channelInputOutput
Official$1$20

Input

1 / 2
Item 1

Must match dialogue turns

Character persona for this voice

1
Item 1

Must exist in Speakers

Supports audio tags such as [shouting] / [whispers] / [urgency]

Controls the randomness of the speech output. Higher values produce more creative and varied delivery, while lower values make the output more predictable and focused. Default value: 1
scene description67/1000
Example Context / Overall Tone90/1000

Output

output typeaudioExample output

README

Complete guide to using google/gemini-3-1-flash-tts