Fish Audio released S2 as an open-source speech model with a 31K+ star GitHub repo and published a research paper plus a full S2 breakdown on 2026-07-28. They also offer S2 Pro in the Fish Audio App and a free web demo (s.fish.audio/nrmvtn), links provided in the announcement by @alex_prompter.
Fish Audio open-sourced its speech model S2 (repo fish-audio/fish-speech) on GitHub; the repository has 31K+ stars.
Research paper and full S2 breakdown
fish.audio/blog/fish-audio-o…
GitHub repo (31K+ stars)
github.com/fishaudio/fish-sp…
Free demo
s.fish.audio/nrmvtn
Link
Fish Audio Open-Sources S2: Fine-Grained Control Meets Production Streaming
S2 Pro is available on Fish Audio Apphttps://fish.audio/app/text-to-speech/ and its open source is available via the project's GitHub repositoryhttps://github.c
fish.audio