Gemini 3.1 Flash TTS vs Gemini 3.8 Flash TTS
AA TTS provider voice AA TTS provider voice (version unstated): People listen to two voices reading the same text and pick the more natural one
Gemini 3.1 Flash TTS1,212
Gemini 3.8 Flash TTS1,279
AA TTS controlled voice AA TTS controlled voice (version unstated): People listen to two voices reading the same text and pick the more natural one
Gemini 3.1 Flash TTS—
Gemini 3.8 Flash TTS1,048
| Benchmark | Gemini 3.1 Flash TTS | Gemini 3.8 Flash TTS |
|---|---|---|
| AA TTS provider voice | 1,212 | 1,279 |
| AA TTS controlled voice | — | 1,048 |
Specs
| Spec | Gemini 3.1 Flash TTS | Gemini 3.8 Flash TTS |
|---|---|---|
| Weights | Closed | Closed |
| Released | Apr 2026 | Sep 2026 |
| Languages | — | en, es, fr +123 |
| Voice cloning | — | Yes |
| Price covers | Exact native tariff; see source for billing scope. | Exact native tariff; see source for billing scope. |
What breaks when you switch
Gemini 3.1 Flash TTS → Gemini 3.8 Flash TTS
Nothing known.
Gemini 3.8 Flash TTS → Gemini 3.1 Flash TTS