Gemini 3.1 Flash TTS (blog.google)

Google has announced the rollout of Gemini 3.1 Flash TTS, an advanced text-to-speech model that significantly enhances speech quality, expressivity, and controllability. Available for developers through the Gemini API, Google AI Studio, and for enterprises on Vertex AI, this model has achieved an impressive Elo score of 1,211 on the Artificial Analysis TTS leaderboard, marking it as one of the most natural and cost-effective options on the market. It supports over 70 languages and features new audio tags that allow users to customize vocal style, pace, and delivery, providing a highly flexible platform for AI-speech applications. The introduction of audio tags enables developers to exert granular control over their outputs, enhancing creative possibilities for character development and narrative immersion. Features such as scene direction, speaker-level specificity, and seamless export capabilities allow for rich, localized audio experiences. Early adopters commend its scalability and precision, noting the transformative power of turning simple text into lifelike performances. Additionally, all outputs are embedded with an imperceptible watermark, SynthID, ensuring the authenticity of the AI-generated content and contributing to responsible usage in the AI/ML community.