Gemini 3.1 Flash TTS
Fast Gemini text-to-speech with natural-sounding expressive voices.
Google's Gemini 3.1 Flash TTS is a cloud text-to-speech model. It converts written text into natural, spoken audio. It offers a choice of 30 voices and supports multiple languages. Output is available as MP3, WAV, and FLAC. It runs through Replicate and Runware using your own API key, from $1.00 per million input tokens.
- Pricing
- $1.00 / 1M in · $20.00 / 1M out
- Type
- Text-to-speech
- Voices
- 30 to choose from
- Languages
- Multilingual
- Output formats
- MP3, WAV, FLAC
Examples
Generated with Gemini 3.1 Flash TTS via Runware — the same three scripts read by every text-to-speech model in the catalog, so the only thing that changes between two models’ clips is the model. Each model uses its own default voice; there is no shared voice to hold constant.
Baseline naturalness and pacing
The last train had already left, but she decided to walk anyway. The city was quieter than she remembered, and for the first time in weeks, she wasn't in a hurry.
Emotion, emphasis, and pauses
Wait — you're telling me it actually worked? After all that? I can't believe it. Honestly, I thought we'd lost the whole thing.
Decimals, percentages, version numbers
The API returned 3,481 results in 0.42 seconds, a 12 percent improvement over version 2.5. Latency at the 99th percentile dropped from 840 milliseconds to 610.
Google and Google DeepMind build the Gemini family of multimodal models, the Imagen and Nano Banana image models, the Lyria music models, and the Veo video models.
deepmind.google ↗