What is Gemini 3.1 Flash TTS?

It is Google's latest text-to-speech AI model that provides enhanced control and expressiveness through audio tags, available in public preview on Google AI Studio and Vertex AI for developers and enterprises.

How do audio tags work in this model?

Audio tags allow users to insert natural language commands into text inputs to precisely control vocal style, pacing, and delivery, with over 200 tags available for fine-tuning audio output.

Is the audio generated by this model identifiable as AI?

Yes, all audio produced by Gemini 3.1 Flash TTS includes SynthID watermarking, which helps identify AI-generated content to promote transparency and prevent misinformation.

What languages are supported by Gemini 3.1 Flash TTS?

The model supports over 70 languages, enabling developers to create applications for diverse global markets and user bases with high-quality speech synthesis.

Google Gemini 3.1 Flash TTS

Text-to-speech API with natural language voice direction

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What is Google Gemini 3.1 Flash TTS

Google Gemini 3.1 Flash TTS is a next-generation text-to-speech API that offers natural language voice direction for precise control over audio generation. It features inline audio tags, multi-speaker dialogue support, and covers over 70 languages, designed for developers building voice agents, dubbing tools, or AI content products via Google AI Studio and Vertex AI, with SynthID watermarking to identify AI-generated content.

Key Features

Inline audio tags for natural language control over vocal style, pace, and expressivity

Multi-speaker dialogue support enabling interactive conversations and diverse audio scenarios

Broad language coverage with support for over 70 languages for global applications

High-fidelity speech quality for more natural and expressive audio output

SynthID watermarking integrated to transparently identify AI-generated audio content

Use Cases

Developers building voice agents for customer service, virtual assistants, or AI chatbots
Content creators and entertainment professionals producing dubbed audio for videos, films, or audiobooks
Enterprises implementing accessible solutions like banking IVR systems, educational tools, or inclusive design applications
Startups and innovators creating AI-powered content products, such as gaming soundtracks or creative media

Why do startups need this tool?

Startups need Gemini 3.1 Flash TTS for cost-effective and scalable integration of advanced speech synthesis into their products, leveraging its API-based access and natural language controls to quickly prototype and deploy voice-enabled applications. Its support for multiple languages and expressive audio features helps startups enhance user experience and compete in global markets like edtech, fintech, and entertainment.