GoogleAudio matchupSpeech output
Gemini 3.1 Flash TTSvs.Gemini 3.8 Flash TTS
Which model is better?
Gemini 3.8 Flash TTS does better in independent tests, while Gemini 3.1 Flash TTS is more popular.
Pick Gemini 3.1 Flash TTS for
Pick Gemini 3.8 Flash TTS for
Shared tests
Independent evaluators and leaderboards only, the newest shared snapshot per evaluator. With 95 % ranges a lead counts when they do not overlap; for hit rates, when it holds in a 95 % test. Without any uncertainty figure at most “slightly ahead”.
VoiceArena
Gemini 3.8 Flash TTS aheadGemini 3.8 Flash TTS is clearly ahead in 4 of 8 subtests, Gemini 3.1 Flash TTS in none. 4 are level.
VoiceArena TTS Elo: Arabic MSA
95 % ranges 1,112 to 1,132 and 1,165 to 1,201, as of October 28, 2026
VoiceArena TTS Elo: Japanese
95 % ranges 1,120 to 1,140 and 1,170 to 1,206, as of October 28, 2026
VoiceArena TTS Elo: Mexican Spanish
95 % ranges 1,072 to 1,100 and 1,120 to 1,156, as of October 28, 2026
Show all 8 subtests
| Subtest | Gemini 3.1 Flash TTS | Gemini 3.8 Flash TTS | Verdict |
|---|---|---|---|
| VoiceArena TTS Elo: Arabic MSA | 1,122 | 1,183 | Gemini 3.8 Flash TTS ahead |
| VoiceArena TTS Elo: Japanese | 1,130 | 1,188 | Gemini 3.8 Flash TTS ahead |
| VoiceArena TTS Elo: Mexican Spanish | 1,086 | 1,138 | Gemini 3.8 Flash TTS ahead |
| VoiceArena TTS Elo: Vietnamese | 1,091 | 1,122 | Gemini 3.8 Flash TTS ahead |
| VoiceArena TTS Elo: Hindi | 1,078 | 1,094 | level |
| VoiceArena TTS Elo: Brazilian Portuguese | 1,089 | 1,097 | level |
| VoiceArena TTS Elo: US English | 1,054 | 1,059 | level |
| VoiceArena TTS v1, US English, All, Elo | 1,054 | 1,059 | level |
Source · latest October 28, 2026
DesignArena
Gemini 3.8 Flash TTS slightly aheadGemini 3.8 Flash TTS is clearly ahead in 0 of 2 subtests and slightly in 1, Gemini 3.1 Flash TTS in none. 1 is level.
DesignArena Audio Realism Elo
as of October 28, 2026
DesignArena TTS Arena Elo
as of October 28, 2026
Source · latest October 28, 2026
Artificial Analysis
Gemini 3.8 Flash TTS aheadArtificial Analysis Provider Voice Arena preference
95 % ranges 1,202 to 1,224 and 1,269 to 1,295, as of November 3, 2026
Source · latest November 3, 2026
Speko
Gemini 3.8 Flash TTS slightly aheadSpeko TTS number-reading score
as of October 17, 2026
Source · latest October 17, 2026
All data side by side
Prices are verbatim from the provider, because audio models bill per minute, character or token.
| Gemini 3.1 Flash TTS | Gemini 3.8 Flash TTS | |
|---|---|---|
| Task | Speech output | Speech output |
| Developer | ||
| Status | Preview | Active |
| Released | n/a | September 22, 2026 |
| Weights | proprietary | n/a |
| Runs locally | no | no |
| Price | n/a | $0.50 per 1M text tokens through December 31, 2026, then $1 per 1M text tokens from January 1, 2027 |
| Popularity (out of 100) | 44 | 0 |