GoogleCartesiaAudio matchupSpeech output
Gemini 3.1 Flash TTSvs.Sonic 3.6
Which model is better?
Sonic 3.6 does better in independent tests.
Pick Gemini 3.1 Flash TTS for
Pick Sonic 3.6 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
levelGemini 3.1 Flash TTS is clearly ahead in 0 of 4 subtests, Sonic 3.6 in none. 4 are level.
VoiceArena TTS Elo: Hindi
95 % ranges 1,070 to 1,086 and 1,081 to 1,107, as of October 28, 2026
VoiceArena TTS Elo: Brazilian Portuguese
95 % ranges 1,081 to 1,097 and 1,062 to 1,094, as of October 28, 2026
VoiceArena TTS Elo: US English
95 % ranges 1,048 to 1,060 and 1,047 to 1,071, as of October 28, 2026
Show all 4 subtests
| Subtest | Gemini 3.1 Flash TTS | Sonic 3.6 | Verdict |
|---|---|---|---|
| VoiceArena TTS Elo: Hindi | 1,078 | 1,094 | level |
| VoiceArena TTS Elo: Brazilian Portuguese | 1,089 | 1,078 | level |
| VoiceArena TTS Elo: US English | 1,054 | 1,059 | level |
| VoiceArena TTS Elo: Mexican Spanish | 1,086 | 1,081 | level |
Source · latest October 28, 2026
Artificial Analysis
Sonic 3.6 aheadArtificial Analysis Provider Voice Arena preference
95 % ranges 1,202 to 1,224 and 1,280 to 1,306, as of November 3, 2026
Source · latest November 3, 2026
DesignArena
Sonic 3.6 slightly aheadDesignArena Audio Realism Elo
as of October 28, 2026
Source · latest October 28, 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 | Sonic 3.6 | |
|---|---|---|
| Task | Speech output | Speech output |
| Developer | Cartesia | |
| Status | Preview | Active |
| Weights | proprietary | proprietary |
| Runs locally | no | no |
| Popularity (out of 100) | 44 | 39 |