Google Gemini 3.1 Flash TTS Becomes Flagship for Expressive Speech
Audio Generation
Gemini
Multimodal
Performance
Google positioned Gemini 3.1 Flash TTS as its primary model for high-fidelity, expressive speech generation. The model utilizes inline audio tags—such as
[excited]—to give users direct control over the emotional tone and performance of the output. This builds on the initial audio tag framework released earlier this month.The update highlights a shift toward directable AI audio that can mimic human performance nuances such as pace and character. By using the Flash architecture, the model maintains the speed required for real-time applications while expanding its expressive range. This follows the pattern of optimizing agentic workloads with specialized multimodal models.
You can use the model to generate speech that requires specific tonal direction for storytelling or interactive agents. The system allows for the integration of these vocal cues directly into text prompts, reducing the need for manual post-production. These capabilities are available through the standard developer platforms used for the Gemini model family.
