What is Gemini 3.1 Flash TTS
Gemini 3.1 Flash TTS is a new-generationtext-to-speechmodel launched by Google, offering stronger controllability, expressiveness, and audio quality. The model supports more than 70 languages and introduces audio tag technology, enabling precise control over voice style, speaking rate, and expression through natural language instructions. Gemini 3.1 Flash TTS scored 1211 Elo on the Artificial Analysis TTS leaderboard, placing it in the optimal quadrant for high quality and low cost. All audio has SynthID invisible watermarking embedded to prevent the spread of false information.
Main features of Gemini 3.1 Flash TTS
- Natural speech synthesis: Supports generating AI voices that are more natural and expressive than the previous generation, achieving the current most natural synthesis effect.
- Audio tag control: Embeds natural language commands into text input to precisely control voice style, speaking rate, and expression.
- Multi-speaker dialogue: Natively supports multi-character dialogue scenarios, and characters can maintain voice consistency across multiple rounds of interaction.
- Multilingual support: High-fidelity speech generation covering more than 70 languages, meeting the needs of global applications.
- Scene direction: Defines environmental context and dialogue instructions to help characters stay "in character" and interact naturally.
- Speaker-level customization: Uses unique Audio Profiles to establish voice fingerprints for characters, and supports director notes to switch tone and accent.
- Seamless export: Exports precise parameter tuning as Gemini API code, ensuring voice consistency across projects and platforms.
- AI watermark protection: All audio automatically has SynthID invisible watermarking embedded, supporting reliable detection of AI-generated content.
How to use Gemini 3.1 Flash TTS
- Developers: ThroughGoogle AI Studiofor preview testing, use configurable controls to adjust scene settings, speaker attributes, and audio tags, then export as Gemini API code to integrate into applications.
- Enterprise users: Access through Vertex AI.
- Workspace users: Directly inGoogle Vids.
Key information and usage requirements for Gemini 3.1 Flash TTS
-
Current status: Developer preview (through Gemini API and Google AI Studio), enterprise preview (Vertex AI), Workspace integration (Google Vids)
-
Language support: 70+ languages
-
Pricing strategy: Falls within the high cost-effectiveness range (Artificial Analysis evaluates it as high quality and low cost quadrant)
-
Security mechanism: Mandatory SynthID watermark embedding, supporting detection of AI-generated content
-
Hardware requirements: Cloud API calls, no local computing resources required
-
Usage limitations: Requires a Google account and API permissions, and there may be rate limits during the preview period
Core advantages of Gemini 3.1 Flash TTS
-
Leading audio quality: Scored 1211 Elo on the Artificial Analysis TTS leaderboard, ranking in the optimal quadrant for high quality and low cost.
-
Fine-grained control: The first audio tag system, enabling director-level control over speech expressiveness.
-
Character consistency: Audio Profiles ensures stable character timbre and style across multi-turn conversations.
-
Global Coverage: High-quality localized voice output in over 70 languages.
-
Security and Compliance: Built-in SynthID watermarking to meet AI content traceability and anti-deepfake requirements.
Project Address of Gemini 3.1 Flash TTS
- Project Official Website：https://blog.google/innovation-and-ai/models-and-research/gemini-models/gemini-3-1-flash-tts/
Comparison of Gemini 3.1 Flash TTS with Similar Competing Products
| Comparison Dimension | Gemini 3.1 Flash TTS | ElevenLabs | OpenAI TTS |
|---|---|---|---|
| Core Positioning | Google Ecosystem TTS Model | Professional Speech Synthesis Platform | General-Purpose TTS API |
| Audio Quality Ranking | Artificial Analysis No. 1 (1211 Elo) | Industry-Leading | Above Average |
| Control Precision | Director-Level Control via Audio Tags | Voice Design + Emotion Control | Preset Voice Selection |
| Multilingual | Native Support for 70+ Languages | 29 Languages | Support for Multiple Languages |
| Multi-Speaker | Native Multi-Character Dialogue | Multi-Speaker Support | Single Speaker |
| Cost Efficiency | High-Quality, Low-Cost Quadrant | On-Demand Pricing Is Relatively Expensive | Billed by Character |
| Security Features | Mandatory SynthID Watermarking | Optional Watermarking | No Native Watermarking |
| Access Method | AI Studio/Vertex API | API/Desktop | API |
| Featured Functions | Scene Director + Audio Profiles | Voice Cloning | Real-Time Streaming Output |
Application Scenarios of Gemini 3.1 Flash TTS
-
Audio Content Production: Developers can use audio tags to precisely control narration style, character dialogue, and emotional expression, creating immersive multi-character narrative experiences for audiobooks, podcasts, and radio dramas.
-
Virtual Assistants and Customer Service: Enterprises can build AI customer service systems with unique voice fingerprints and emotional expression capabilities, adjusting tone in real time through natural language instructions to adapt to different service scenarios.
-
Game and Film/Television Production: Game developers can assign dedicated Audio Profiles to NPC characters and define scene backgrounds, ensuring characters maintain voice consistency and contextualized performance across multi-turn interactions.
-
Education and Training Content: Educational institutions can use support for over 70 languages to produce localized voice teaching materials, adjusting speech rate and pronunciation style through director notes to suit learners of different age groups.
-
Accessibility Assistance Services: Developers can integrate highly natural speech to provide screen reading and assisted reading functions for visually impaired users, while relying on SynthID watermarking to ensure transparent and trustworthy content provenance.