OpenAIFish AudioAudio matchupSpeech output
GPT-4o Mini TTSvs.Fish Audio S2.1 Pro
Which model is better?
Fish Audio S2.1 Pro does better in independent tests, while GPT-4o Mini TTS is more popular.
Pick GPT-4o Mini TTS for
Pick Fish Audio S2.1 Pro 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”.
DesignArena
GPT-4o Mini TTS slightly aheadDesignArena Audio Realism Elo
as of October 28, 2026
Source · latest October 28, 2026
Speko
Fish Audio S2.1 Pro slightly aheadSpeko TTS naturalness Elo
as of October 28, 2026
Source · latest October 28, 2026
VoiceArena
Fish Audio S2.1 Pro aheadVoiceArena TTS Elo: US English
95 % ranges 919 to 933 and 975 to 1,003, 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 | Fish Audio S2.1 Pro | |
|---|---|---|
| Task | Speech output | Speech output |
| Developer | OpenAI | Fish Audio |
| Status | Deprecated | Active |
| Released | n/a | June 23, 2026 |
| Weights | proprietary | proprietary |
| Runs locally | no | no |
| Price | $0.60 per 1M text tokens | Free through 2026-11-30 under fair-use rules; changes with advance notice |
| Popularity (out of 100) | 36 | 0 |