whatmodel.sh / tts / Fish Audio S2.1 Pro

Fish Audio S2.1 Pro

+ contribute
Update model informationAdd a place to run itAdd a test resultPropose a benchmarkCorrect a benchmark scoreEdit data on GitHub

Fish Audio S2.1 Pro is a closed-weights text-to-speech model from Fish Audio, released June 2026. Licence: proprietary.

Catalogue identity notes

Vapi registry fish-s21-pro, apiModelId s2.1-pro (hosted API). Distinct from open-weight S2 Pro. Rating-only comparison identity; no price, API or run metadata asserted.

63.4±3.2#24 of 118 text-to-speech modelsfrom 1 benchmark result across 1 source* thinly tested, treat the rank as provisional

Score within the Vapi Humanness · Bradley–Terry rating, 2026-09-25 snapshot comparison set only.

$ how it compares

The text-to-speech models ranked either side of Fish Audio S2.1 Pro, out of 148 with a score, then more from Fish Audio.

#modelscorewhereRAMreleased
29Wayu-Paxa-TTS-Edge Wayu Research / Paxa Labs64±4local~0.3GB2026-08
30Eleven Turbo v2.5 ElevenLabs64±4api $50.00/M chars2024-07
31Fish Audio S2.1 Pro Fish Audio63±3api $15.00/M chars2026-06
32IndexTTS-2 IndexTeam (bilibili)63±1local~8.9GB2025-09
33MOSS-TTS v1.5 (8B) OpenMOSS63±2local~24GB2026-05
more from Fish Audio
5OpenAudio S1 Fish Audio71±8api $15.00/M chars2025-06
37Fish Audio S2 Pro Fish Audio63±1api $15.00/M chars +local~11GB2026-03
88Fish Speech 1.2 Fish Audio49±14local~1.2GB2024-07

see all text-to-speech models · find the ones that fit your machine

$ what it's good at

other tests1 not in a task · 96% of its score
testresultvs the others in its rundifficultycountswhy
Vapi Humanness · Bradley–Terry rating, 2026-09-25 snapshot1240.1 ✎▁···▁▃··█▄▃▇ beats 13/18avg 1078▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇ 96%typical

$ where to run it

Through an API

api · $15.00/M chars · docs.fish.audio ↗ · price sourceFish Audio lists s2.1-pro at $15.00 per 1M UTF-8 bytes of input text. Stored as per 1M characters, which equals bytes only for ASCII (e.g. English) text; non-ASCII characters take 2-4 bytes, so per-character cost is higher for those scripts. Product: Fish Audio TTS API. API model: s2.1-pro. Settings: pay-as-you-go (not s2.1-pro-free). Price basis: published list rate (byte-billed). Exclusions: none stated. Currency: USD. Fish Audio official pricing docs, observed 2026-09-25.

$ how the score was worked out · The Humanness Index by Vapi ·… 96%

Each result implies a score on its own, after adjusting for how hard its test is and who ran it. The score is their weighted average, with a small pull toward the middle for thinly tested models. Each test's weight is its counts column above; here it's added up by who ran the tests. How it works

sourceresultsshare of the scorelicence
The Humanness Index by Vapi · September 2026 public standings1▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇ 96%CC BY 4.0
prior · pull toward the middle▇ 4%
weighted average= 63.4

$ improve this page

Update model informationAdd a place to run itAdd a test resultPropose a benchmarkCorrect a benchmark scoreEdit data on GitHub

Use a short GitHub form or edit the data through a pull request. Every number needs a source; here's which ones we can use.

data updated · sources and licences · json