OpenAudio S1 text-to-speech model

Fish AudioCNReleased Jun 2025.

OpenAudio S1 is a text-to-speech (TTS) model from Fish Audio. It ranks #48 of 98 on the Artificial Analysis TTS arena with Elo 1087 (95% CI ±11, 4,658 samples). On TTS Arena V2 it scores Elo 1491 (±28, 608 votes). List price is about $15 per 1M characters. Released Jun 2025.

Data updated Oct 25, 2026
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Key facts

AA Elo1087±11#48 / 98

TTS Arena Elo1491±28TTS Arena votes 608

Price (per 1M chars)$15USD

ReleasedJun 2025Open weights：–

Provider: Fish Audio
AA rank: #48 / 98
AA Elo (95% CI): 1087 ±11
AA samples: 4,658
TTS Arena Elo (uncertainty): 1491 ±28
TTS Arena votes: 608
TTS Arena win rate: 46.4%
Price (per 1M chars): $15
Released: Jun 2025
Open weights: –
License: –
Voices tested by AA: 8
Languages: –
Voice cloning: –

"–" means the upstream sources do not provide this value; we do not guess.

Nearby models

By AA Elo; this model highlighted

#	Model	AA Elo	Arena Elo	Price $/1M chars	Open weights
45	Speech-02-Turbo MiniMax	1092	1495	$60	–
46	Voxtral TTS Mistral	1091	–	$16	Open
47	TTS-1 OpenAI	1089	–	$15	–
48	OpenAudio S1 Fish Audio	1087	1491	$15	–
49	Gemini 2.5 Flash Lite TTS Google	1087	–	$9.2	–
50	Flash v2.5 ElevenLabs	1078	1498	$50	–
51	GPT-Realtime-2 OpenAI	1077	–	$191.6	–

Alternatives · Cheaper with AA Elo ≥ 1057

#	Model	AA Elo	Arena Elo	Price $/1M chars	Open weights
8	Gemini 3.8 Flash-Lite TTS Google	1252	–	$11	–
10	SSimba 3.2 SpeechifyAI	1246	–	$6.6	–
12	IRealtime TTS-2 Flash Inworld	1219	–	$10.4	–
13	Voxtral 3 TTS Mistral	1219	–	$13	–
22	SSoniox TTS Real-Time v2 Soniox	1182	–	$14.2	–

Alternatives · More from Fish Audio

#	Model	AA Elo	Arena Elo	Price $/1M chars	Open weights
–	OpenAudio S2 Fish Audio	–	1515	–	–
9	Fish Audio Drama 3 Preview Fish Audio	1248	–	$15	Open
20	Fish Audio S2.1 Pro (Oct 2026) Fish Audio	1186	–	$15	–
38	Fish Audio S2 Pro Fish Audio	1110	–	$15	Open
70	OpenAudio S1 Mini Fish Audio	1045	–	$15	Open

Alternatives · Top 5 open-weight by AA Elo

#	Model	AA Elo	Arena Elo	Price $/1M chars	Open weights
9	Fish Audio Drama 3 Preview Fish Audio	1248	–	$15	Open
11	BBreeze TTS 2 BreezeBlue	1230	–	$34	Open
19	Ming-3.0-tts Ant Group	1191	–	–	Open
38	Fish Audio S2 Pro Fish Audio	1110	–	$15	Open
41	Step Audio EditX (Mar 2026) StepFun	1100	–	–	Open

FAQ

Where does OpenAudio S1 rank among TTS models?

As of Oct 25, 2026, OpenAudio S1 ranks #48 of 98 on the Artificial Analysis TTS leaderboard with Elo 1087 (±11).

Is OpenAudio S1 open source?

The sources do not list OpenAudio S1 as open-weight; it is generally used through the Fish Audio API.

What is the best Chinese TTS model?

By AA Elo, the top model from a Chinese provider is Qwen-Audio-3.1-TTS-Plus by Alibaba (Elo 1307, #3 overall).

Which top-10 TTS model is cheapest?

Among the AA top 10, the lowest list price is Simba 3.2 (SpeechifyAI) at $6.6 per 1M characters, Elo 1246.

What is the best open-source TTS model?

By AA Elo, the top open-weight model is Fish Audio Drama 3 Preview by Fish Audio (Elo 1248, #9 overall); 18 open-weight models have an AA score.

Sources