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.