OpenAIFish AudioAudio matchupSpeech output
GPT-4o Mini TTSvs.Fish Audio S2 Pro
Which model is better?
GPT-4o Mini TTS and Fish Audio S2 Pro perform about the same in independent tests.
Independent testsVoiceArena
GPT-4o Mini TTS0 of 1
Fish Audio S2 Pro0 of 1
Popularityout of 100
GPT-4o Mini TTS36
Fish Audio S2 Proahead51
Weights and access
GPT-4o Mini TTSproprietary
Fish Audio S2 Proopenopen, local
Priceverbatim from the provider
GPT-4o Mini TTS$0.60 per 1M text tokens
Fish Audio S2 Pron/a
Pick GPT-4o Mini TTS for
No clear edge
Pick Fish Audio S2 Pro for
open weightsruns locallymore 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
levelVoiceArena TTS Elo: US English
GPT-4o Mini TTS926
Fish Audio S2 Pro936
95 % ranges 919 to 933 and 929 to 943, 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 Pro | |
|---|---|---|
| Task | Speech output | Speech output |
| Developer | OpenAI | Fish Audio |
| Status | Deprecated | Open weights |
| Released | n/a | March 9, 2026 |
| Weights | proprietary | open |
| Runs locally | no | yes |
| Price | $0.60 per 1M text tokens | n/a |
| Popularity (out of 100) | 36 | 51 |