Fish Audio · 2024–26 · S2 Pro

Fish Audio / Fish Speech

Open weights with a research license (commercial use needs a deal) and a hosted API. S2 Pro is a large dual-autoregressive codec model. The clip on this bench is the open Fish-Speech system from the IndexTTS comparison page, not a private S2 Pro API call.

Known for

Top open-weight arena rank with a non-permissive license asterisk.

Vendor / paper demo

Speaker 1 (Fish-Speech) · Fish-Speech clip from the IndexTTS comparison table, Speaker 1.

Old will is a fine fellow but poor and helpless since missus rogers had her accident.

Approach
Codec LM
Year / era
2024
License class
research
Cloning
Yes
Streaming
Yes
Emotion controls
Yes
Languages (tags)
en · zh · multilingual
Official
Source
Kokoro 82M · af_heart