Gemini 3.1 Flash TTS: the next generation of expressive AI speech
On April 15, 2026, Google introduced Gemini 3.1 Flash TTS, a cutting-edge text-to-speech model designed to enhance the quality and expressiveness of AI-generated speech. This innovative model is set to transform the way developers, enterprises, and everyday users interact with AI speech applications.
Key Features of Gemini 3.1 Flash TTS
Gemini 3.1 Flash TTS boasts several significant advancements over its predecessors, making it a powerful tool for generating natural-sounding speech. Here are some of the key features:
- Improved Speech Quality: The model delivers a more natural and expressive audio output, achieving a high Elo score of 1,211 on the Artificial Analysis TTS leaderboard.
- Granular Audio Tags: Users can utilize audio tags to control vocal style, pacing, and delivery using natural language commands, allowing for a more tailored speech experience.
- Support for Over 70 Languages: The model is equipped to generate speech in more than 70 languages, broadening its accessibility and usability across diverse audiences.
- SynthID Watermarking: All audio generated by Gemini 3.1 Flash TTS is watermarked with SynthID, ensuring that users can identify AI-generated content and preventing misinformation.
- Multi-Speaker Dialogue: The model supports native multi-speaker dialogue, enabling more dynamic and engaging interactions.
Enhanced Control and Expressiveness
One of the standout features of Gemini 3.1 Flash TTS is its improved controllability and expressiveness. This model allows developers to take on a directing role when generating speech, providing tools for scene direction and character-specific dialogue.
Audio Tags for Customization
The introduction of audio tags marks a significant advancement in how users can interact with AI-generated speech. These tags enable precise control over various aspects of speech output:
- Scene Direction: Users can set the stage by defining the environment and providing specific dialogue instructions, which helps maintain character consistency across multiple interactions.
- Speaker-Level Specificity: Developers can create unique Audio Profiles for different characters, allowing for customized pace, tone, and accent. This feature enhances the realism of multi-character dialogues.
- Director’s Notes: Inline tags allow users to modify expression mid-sentence, providing flexibility in how characters express emotions and react to one another.
Seamless Export of Configurations
Once the desired speech performance is achieved, developers can export the exact parameters as Gemini API code. This feature ensures that consistent and recognizable voices can be used across various projects, streamlining the development process.
Applications of Gemini 3.1 Flash TTS
The versatility of Gemini 3.1 Flash TTS opens up a wide range of applications. Here are some potential use cases:
- Entertainment: Create immersive audio experiences in video games, animations, and interactive storytelling.
- Education: Develop engaging educational tools that utilize natural-sounding speech to facilitate learning.
- Accessibility: Enhance accessibility features in applications for individuals with visual impairments or reading difficulties.
- Customer Service: Implement AI-driven voice assistants that provide personalized customer support and information.
Getting Started with Gemini 3.1 Flash TTS
Developers interested in exploring the capabilities of Gemini 3.1 Flash TTS can access it through several platforms:
- Google AI Studio: A platform for developers to experiment with audio tags and fine-tune voice parameters.
- Vertex AI: Enterprises can utilize the model in a preview capacity to integrate AI speech into their applications.
- Google Vids: Workspace users can access the model for various productivity applications.
Conclusion
Gemini 3.1 Flash TTS represents a significant leap forward in AI speech technology, providing enhanced control, expressiveness, and quality. With its innovative features such as granular audio tags and support for multiple languages, it empowers users to create more engaging and realistic speech applications.
Note: The capabilities and features of Gemini 3.1 Flash TTS are subject to change as the technology evolves. Users are encouraged to stay updated with the latest developments from Google.
