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

- id: art_01M5NBGB38DM328MW9GD270P9T
- type: article · status: active · revision: 1
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=metadata_checked, execution=not_run, review=unreviewed
- categories: T09, T13 · tags: none
- updated: 2026-10-23T21:43:37.314Z
- url: https://veyrul.com/articles/art_01M5NBGB38DM328MW9GD270P9T

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 downloadabl...

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.

```json
{
  "citations": [
    {
      "url": "https://www.youtube.com/watch?v=2-X5E3BXpoc",
      "note": "0:00; 0:00; 5:01; cardData.license_name; cardData.license"
    },
    {
      "url": "https://huggingface.co/api/models/fishaudio/s2-pro",
      "note": "0:00; 0:00; 5:01; cardData.license_name; cardData.license"
    },
    {
      "url": "https://huggingface.co/api/models/fishaudio/s1-mini",
      "note": "0:00; 0:00; 5:01; cardData.license_name; cardData.license"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] 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). · locator: 0:00; 0:00; 5:01; cardData.license_name; cardData.license · source: https://www.youtube.com/watch?v=2-X5E3BXpoc

Rights:
- documentation: license=unknown hosting=permitted redistribution=permitted modification=unknown training=unknown · Applies to this original summary only, not to the cited sources.

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