Expressive multi-speaker speech in 70-plus languages, but this preview shuts down on 17 November 2026; new projects belong on 3.8 Flash TTS.
Kenning's take
What it does
Gemini 3.1 Flash TTS turns text into speech in more than 70 languages, with multi-speaker dialogue. Inline audio tags and director-style notes let developers set pace, tone and accent mid-sentence. Google now calls it a legacy preview and points developers to Gemini 3.8 Flash TTS; the preview shuts down on 17 November 2026.
- Audio tags for style, pace and delivery
- Native multi-speaker dialogue
- 70+ languages
- Scene and speaker direction in AI Studio
- SynthID watermark
Who it suits. Developers making narration, dialogue or voice apps.
Key facts
- Category
- AI models
- Part of
- Google Gemini
- Made by
- Based in
- United States
- Released
- 15 April 2026
- How to get it
- Gemini API and AI Studio (preview), Vertex AI preview, and Google Vids for Workspace users; preview shutdown set for 17 November 2026
- Works on
- API, Web
- In the UK
- Yes
- Free plan
- Yes, Gemini API free tier
- API price
- $1.00 per million text input tokens, $20.00 per million audio output tokens
FAQ
When was Gemini 3.1 Flash TTS released?
15 April 2026.
How many languages does it support?
More than 70, according to Google.
What replaces it?
Google recommends Gemini 3.8 Flash TTS or 3.8 Flash-Lite TTS.
Facts from the maker's own pages and the sources listed. Checked 2026-10-11.
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