Rankings
Review
Gemini 3.1 Flash TTS is a solid choice for applications requiring high-quality, low-latency text-to-speech. Best suited for developers seeking straightforward integration without the need for advanced TTS features or custom voice training.
Strengths
- Natural, clear voice with nuanced emotional delivery (ranked #2 on TTS leaderboards)
- High processing speed and low latency for real-time speech output
- Multilingual support with flexible voice configurations
Weaknesses
- Not the top choice for use cases demanding absolute peak voice quality
- API pricing may be higher than budget-oriented TTS alternatives
- Lacks advanced TTS capabilities like voice cloning or custom voice model fine-tuning
Use cases
Guides & videos
Gemini 3.1 Flash TTS is Google's text-to-speech model launched in April 2026, accessible for free via Google AI Studio or through the Gemini API and Vertex AI for enterprise users. The model supports 70+ languages and 30 voices, making it well-suited for voiceovers, audiobooks, podcasts, chatbot voices, and accessibility tools. Its standout feature is an inline library of 200+ audio tags—such as [whispers], [laughs], [excited], and [pause=1.0]—providing granular control over emotion, pacing, and intonation sentence by sentence. Tip: Combine a natural language prompt at the start ('Read this in a calm, professional tone:') with inline audio tags for best results; all audio output is automatically watermarked with SynthID.