Gemini 3.8 Flash TTS and the Gemini voice models
Google's Gemini line added native text-to-speech in 2025 as a preview, made it a model in its own right with 3.1 Flash TTS, and on 23 September 2026 split it into two tiers: 3.8 Flash TTS for directed, creative work and 3.8 Flash Lite TTS for high-volume reading. Each has a page here, reading the same four scripts as every voice model on this site.
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Which one to pick
Gemini 3.8 Flash TTS
$0.045 per 1,000 characters via fal
Directed reads and two-speaker dialogue at $0.045 per thousand characters.
Gemini 3.8 Flash Lite TTS
$0.03 per 1,000 characters via fal
High-volume reading at $0.03 per thousand characters.
Gemini 3.1 Flash TTS
$0.05 per 1,000 characters via fal
An existing integration that needs mp3 or ogg straight from fal.
Side by side, measured
| Model | Price | Seconds to return | Cost of its fixed set | Voices |
|---|---|---|---|---|
| Gemini 3.8 Flash TTS | $0.045 per 1,000 characters via fal | 7 to 9 | $0.044 4 scripts | Thirty prebuilt voices on fal, Kore by default, which we used; Google's own API adds a library of more than 2,000 and voice replication |
| Gemini 3.8 Flash Lite TTS | $0.03 per 1,000 characters via fal | 4 to 10 | $0.029 4 scripts | Thirty prebuilt voices on fal, Kore by default, which we used; Google's API adds its voice library and replication |
| Gemini 3.1 Flash TTS | $0.05 per 1,000 characters via fal | 13 to 19 | $0.049 4 scripts | Thirty named voices, Kore by default, which we used; no cloning |
Seconds and cost are from our own runs of each model's fixed set: the same 4 scripts for every model that makes readings from text. Open a model for every reading and the request behind it.
Every version
| Version | Released | What changed |
|---|---|---|
| Gemini 2.5 Flash Preview TTS | First Gemini TTS preview with 30 voices and multi-speaker. | |
| Gemini 3.1 Flash TTS gemini-3.1-flash-tts | Inline tags, plain-language style directions, 80-plus languages. | |
| Gemini 3.8 Flash TTS gemini-3.8-flash-tts | Voice library, voice design and replication on Google's API, more than 130 languages. | |
| Gemini 3.8 Flash Lite TTS gemini-3.8-flash-lite-tts | The cheaper tier for dubbing and agents, 101 languages. |
Frequently asked questions
Is Gemini TTS free?
Google's pricing page lists Gemini 3.1 Flash TTS and the 3.8 Flash and Flash Lite TTS models as free of charge on the Gemini API's rate-limited free tier, read on 22 October 2026. fal charges per character.
Which Gemini TTS model should I use?
3.8 Flash TTS for directed, expressive work and 3.8 Flash Lite TTS for volume. On fal they cost $0.045 and $0.03 per thousand characters.