Gemini 3.1 Flash TTS Preview
google/gemini-3.1-flash-tts-preview
Usage data date 2026-07-26 · updated daily
Usage and specs
What is Gemini 3.1 Flash TTS Preview
Gemini 3.1 Flash TTS Preview is a text-to-speech model from Google, and a substantial generational step up from Gemini 2.5 Flash TTS. It takes text input and produces audio output across 70+ languages — nearly 3× the language coverage of its predecessor. The headline addition is a system of 200+ inline audio tags (e.g. `[whispers]`, `[laughs]`, `[excited]`) that let developers steer delivery, emotion, and pacing mid-sentence, alongside a "director's chair" workflow in Google AI Studio for defining per-character Audio Profiles and scene-level context. It supports up to two speakers with independent voice and style configuration per speaker, outputs PCM audio at 24 kHz / 16-bit mono, and automatically watermarks all output with SynthID. Context window is 32k tokens.
Tools built on this model
Google Gemini
Most useful for people already working in Google services, with plan limits and data permissions worth checking first.
Google AI
Best for self-taught learners and developers who want to connect AI study with hands-on practice; not for learners needing systematic Chinese-language instruction.
Imagen
Best for researchers, engineers, and technology decision-makers tracking text-to-image progress; not for casual users who want to generate images right away.
Gemini
Best for users embedded in the Google ecosystem who need multimodal and automation power; not suitable for users in restricted regions or those who avoid Google services.
PaLM 2
Suited to AI developers, researchers, and enterprise teams in the Google ecosystem; not for everyday users seeking a ready-made consumer chatbot.