Gemini 3.1 Flash TTS
Expressive text-to-speech with audio tags, multi-speaker dialogue, and 70+ languages
Gemini 3.1 Flash TTS
Expressive text-to-speech with audio tags, multi-speaker dialogue, and 70+ languages
Gemini 3.1 Flash TTS Overview
Gemini 3.1 Flash TTS is a text-to-speech model for expressive spoken audio generation from text. It supports granular control over delivery through audio tags, native multi-speaker dialogue, and speech generation across 70+ languages, making it suitable for narration, conversational voice apps, podcasts, audiobooks, and other production-oriented voice workflows.
Commercial use
How to Use Gemini 3.1 Flash TTS
Overview
Gemini 3.1 Flash TTS is a text-to-speech model for generating spoken audio from text with stronger control over delivery, pacing, and expressiveness than standard narration-focused TTS models.
It is suited to workflows where the speech output needs to sound natural but also follow more specific direction around style, tone, and speaker interaction.
Capabilities
Expressive Speech Generation
The model is designed for natural and expressive speech output, with stronger control over delivery than basic text-to-speech pipelines. This makes it useful for narration, conversational audio, character dialogue, and presentation-style voice output.
Audio Tags for Fine-Grained Control
Gemini 3.1 Flash TTS supports audio tags that let you steer vocal style, pace, and delivery directly from the text input. This is useful when the speech needs tighter control over tone, emphasis, rhythm, or presentation style.
Native Multi-Speaker Dialogue
The model supports multi-speaker dialogue generation, which makes it suitable for podcast-style output, scripted conversations, role-based assistants, and other workflows that need more than one speaking voice in a single generation.
Speaker-Level Direction
The model supports speaker-level control through audio profiles and inline direction, making it possible to manage character-specific delivery and adjust expression within the same scene or line.
Multilingual Speech Output
Gemini 3.1 Flash TTS supports speech generation in more than 70 languages, which is useful for multilingual products, localized content pipelines, and global voice interfaces.
Input and Output
- Runware model ID:
google-gemini-3-1-flash-tts - AIR ID:
google:[email protected] - Input: text with optional audio tags and speaker-level direction
- Output: generated speech audio
- Languages: 70+
- Dialogue support: multi-speaker generation supported
Typical Use Cases
- Voice assistants and conversational agents
- Narration and voiceover generation
- Podcasts and audiobook-style output
- Multi-speaker scripted dialogue
- Localized speech generation across many languages
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