OpenAIGoogleAudio matchupSpeech output

GPT-4o Mini TTSvs.Gemini 3.1 Flash TTS

Which model is better?

Gemini 3.1 Flash TTS does better in independent tests.

Independent tests

GPT-4o Mini TTS0 of 2

Gemini 3.1 Flash TTSahead1 of 2

VoiceArena, DesignArena

Popularity

GPT-4o Mini TTS36

Gemini 3.1 Flash TTSahead44

out of 100

Weights and access

GPT-4o Mini TTSproprietary

Gemini 3.1 Flash TTSproprietary

Price

GPT-4o Mini TTS$0.60 per 1M text tokens

Gemini 3.1 Flash TTSn/a

verbatim from the provider

Pick GPT-4o Mini TTS for

No clear edge

Pick Gemini 3.1 Flash TTS for

VoiceArenaleaning DesignArenamore popular

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 3.1 Flash TTS ahead

Gemini 3.1 Flash TTS is clearly ahead in 7 of 7 subtests, GPT-4o Mini TTS in none.

VoiceArena TTS Elo: Vietnamese

GPT-4o Mini TTS831

Gemini 3.1 Flash TTS1,091

95 % ranges 819 to 843 and 1,081 to 1,101, as of October 28, 2026

VoiceArena TTS Elo: Hindi

GPT-4o Mini TTS834

Gemini 3.1 Flash TTS1,078

95 % ranges 824 to 844 and 1,070 to 1,086, as of October 28, 2026

VoiceArena TTS Elo: Arabic MSA

GPT-4o Mini TTS897

Gemini 3.1 Flash TTS1,122

95 % ranges 887 to 907 and 1,112 to 1,132, as of October 28, 2026

Show all 7 subtests

Subtest	GPT-4o Mini TTS	Gemini 3.1 Flash TTS	Verdict
VoiceArena TTS Elo: Vietnamese	831	1,091	Gemini 3.1 Flash TTS ahead
VoiceArena TTS Elo: Hindi	834	1,078	Gemini 3.1 Flash TTS ahead
VoiceArena TTS Elo: Arabic MSA	897	1,122	Gemini 3.1 Flash TTS ahead
VoiceArena TTS Elo: Mexican Spanish	875	1,086	Gemini 3.1 Flash TTS ahead
VoiceArena TTS Elo: Japanese	959	1,130	Gemini 3.1 Flash TTS ahead
VoiceArena TTS Elo: Brazilian Portuguese	940	1,089	Gemini 3.1 Flash TTS ahead
VoiceArena TTS Elo: US English	926	1,054	Gemini 3.1 Flash TTS ahead

Source · latest October 28, 2026

DesignArena

Gemini 3.1 Flash TTS slightly ahead

Gemini 3.1 Flash TTS is clearly ahead in 0 of 2 subtests and slightly in 1, GPT-4o Mini TTS in none. 1 is level.

DesignArena TTS Arena Elo

GPT-4o Mini TTS1,186

Gemini 3.1 Flash TTS1,424

as of October 28, 2026

DesignArena Audio Realism Elo

GPT-4o Mini TTS1,029

Gemini 3.1 Flash TTS1,025

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 3.1 Flash TTS
Task	Speech output	Speech output
Developer	OpenAI	Google
Status	Deprecated	Preview
Weights	proprietary	proprietary
Runs locally	no	no
Price	$0.60 per 1M text tokens	n/a
Popularity (out of 100)	36	44

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