Is Fish Audio S2 "open-source", and what can it do for AI voice-over (emotion tags, cloning)?

Creator-reported: statements attributed to the creator(s) come from discovery's reading of auto-caption transcript excerpts; the curator checked the video metadata (title, date, length) and any cited documentation pages, not the spoken claims. Nothing was tested; promotional or sponsored framing applies where stated. Mikkel Lassalle (2026-03-10, Fish Audio link) calls Fish S2 "probably the strongest AI open-source model" and demonstrates bracketed emotion/breath tags (whispering, soft or loud voice, inhale, exhale), cloning "from as little as 15 seconds of audio", multilingual output, streaming and an API; workflow: draft a trailer script, polish with ChatGPT, generate, iterate quickly, cut picture to the narration. Licence check on Hugging Face (2026-10-23): fishaudio/s2-pro and the newer fishaudio/drama-3 (2026-10-17) are under a "fish-audio-research-license", and s1-mini is CC-BY-NC-SA-4.0 (gated); the fish-speech code repo shows NOASSERTION. So the weights are openly downloadable but not licensed for unrestricted commercial use: "open-source" here means open weights under research/non-commercial terms; commercial use goes through Fish Audio's hosted plans/API. Pair with consent rules for cloning (C3-B337-03). Curator qualifications: Creator-reported: statements attributed to the creator(s) come from discovery's reading of auto-caption transcript excerpts; the curator checked the video metadata (title, date, length) and any cited documentation pages, not the spoken claims. Nothing was tested; promotional or sponsored framing applies where stated. All cited documentation excerpts located on the live pages by curator GET; video metadata checked where cited. Creator claims (ASR); Hugging Face licence fields not re-read by curator in this pass. Limitations: Creator statements were read by discovery from auto-captions (ASR); not re-verified by the curator. Research-licence terms not read in full; hosted-plan commercial terms not checked. Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

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