# Seamless Communication (SeamlessM4T, SeamlessExpressive)

- id: src_01M569EGAXSZH3G1250XJ2HX3F
- type: source · status: active · revision: 2
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=source_inspected, execution=not_run, review=unreviewed
- categories: T13 · tags: level:frontier, speech-translation, s2st, dubbing, multilingual, cc-by-nc, code:python
- updated: 2026-10-18T01:24:11.984Z
- url: https://veyrul.com/sources/src_01M569EGAXSZH3G1250XJ2HX3F

Source: https://github.com/facebookresearch/seamless_communication

```json
{
  "archived": false,
  "checked_at": "2026-10-17T00:00:00.000Z",
  "parent_url": null,
  "usefulness": "Meta's SeamlessM4T family: speech-to-speech, speech-to-text, text-to-speech and text-to-text translation across nearly 100 languages, plus SeamlessExpressive (prosody-preserving). Core research option for localization/dubbing; license is non-commercial.",
  "source_type": "repository",
  "availability": "available",
  "dependencies": [],
  "source_owner": "Meta FAIR",
  "next_check_at": "2026-10-24T00:00:00.000Z",
  "successor_url": null,
  "hardware_notes": null,
  "known_limitations": [
    "Non-commercial license for code in this repository."
  ],
  "upstream_updated_at": "2026-09-08T12:22:24.000Z"
}
```

Evidence claims:
- [upstream_claim] README: SeamlessM4T is an all-in-one massively multilingual multimodal translation model for speech and text in nearly 100 languages (S2ST, S2TT, T2ST, T2TT); it is the foundation for SeamlessExpressive. · locator: README, Intro · source: https://github.com/facebookresearch/seamless_communication
- [sourced_fact] Repository LICENSE file is the Creative Commons Attribution-NonCommercial 4.0 International text (GitHub reports NOASSERTION). · locator: LICENSE, header · source: https://github.com/facebookresearch/seamless_communication
- [sourced_fact] README links Hugging Face demo spaces (SeamlessM4T v2, SeamlessExpressive) and the seamless-m4t-v2-large model card. · locator: README, demo table · source: https://github.com/facebookresearch/seamless_communication
- [upstream_claim] Research review verdict at export: reviewed (as of 2026-10-17). Recorded by the research pipeline, not a hub review outcome; evidence.review stays unreviewed until an independent reviewer records one.

Rights:
- code: license=CC-BY-NC-4.0 hosting=restricted redistribution=restricted modification=restricted training=unknown · Non-commercial per LICENSE; commercial use not permitted by this text. · evidence: https://github.com/facebookresearch/seamless_communication/blob/main/LICENSE
- model_weights: license=unknown hosting=unknown redistribution=unknown modification=unknown training=unknown · Weights model card license was not fetched; assume non-commercial only after checking. · evidence: https://github.com/facebookresearch/seamless_communication

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