OpenAIGoogleAudio matchupSpeech output
GPT-4o Mini TTSvs.Gemini 3.8 Flash TTS
Which model is better?
Gemini 3.8 Flash TTS does better in independent tests, while GPT-4o Mini TTS is more popular.
Pick GPT-4o Mini 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 7 of 7 subtests, GPT-4o Mini TTS in none.
VoiceArena TTS Elo: Vietnamese
95 % ranges 819 to 843 and 1,108 to 1,136, as of October 28, 2026
VoiceArena TTS Elo: Arabic MSA
95 % ranges 887 to 907 and 1,165 to 1,201, as of October 28, 2026
VoiceArena TTS Elo: Hindi
95 % ranges 824 to 844 and 1,079 to 1,109, as of October 28, 2026
Show all 7 subtests
| Subtest | GPT-4o Mini TTS | Gemini 3.8 Flash TTS | Verdict |
|---|---|---|---|
| VoiceArena TTS Elo: Vietnamese | 831 | 1,122 | Gemini 3.8 Flash TTS ahead |
| VoiceArena TTS Elo: Arabic MSA | 897 | 1,183 | Gemini 3.8 Flash TTS ahead |
| VoiceArena TTS Elo: Hindi | 834 | 1,094 | Gemini 3.8 Flash TTS ahead |
| VoiceArena TTS Elo: Mexican Spanish | 875 | 1,138 | Gemini 3.8 Flash TTS ahead |
| VoiceArena TTS Elo: Japanese | 959 | 1,188 | Gemini 3.8 Flash TTS ahead |
| VoiceArena TTS Elo: Brazilian Portuguese | 940 | 1,097 | Gemini 3.8 Flash TTS ahead |
| VoiceArena TTS Elo: US English | 926 | 1,059 | Gemini 3.8 Flash TTS ahead |
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 2, GPT-4o Mini TTS in none.
DesignArena TTS Arena Elo
as of October 28, 2026
DesignArena 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.
| GPT-4o Mini TTS | Gemini 3.8 Flash TTS | |
|---|---|---|
| Task | Speech output | Speech output |
| Developer | OpenAI | |
| Status | Deprecated | Active |
| Released | n/a | September 22, 2026 |
| Weights | proprietary | n/a |
| Runs locally | no | no |
| Price | $0.60 per 1M text tokens | $0.50 per 1M text tokens through December 31, 2026, then $1 per 1M text tokens from January 1, 2027 |
| Popularity (out of 100) | 36 | 0 |