Voice assistantsSpeech to text

SeamlessM4T / Seamless

Speech and text translation across roughly a hundred languages, including Russian: speech to text, speech to speech, and streaming translation that keeps intonation.

The last open version came out in Nov 2023. The family has not been updated for a long time: the model still works, but do not expect fixes or new sizes.

Developer
Meta, USA
First release
Aug 2023
Latest release
Nov 2023
Sizes
281M – 2.3B
License
Non-commercial onlyCC BY-NC 4.0, non-commercial use only
Russian
Supported
Running
On your own serverNeeds a GPU
Industries
Science and research, Education
Deploy on your server Hugging Face GitHub

What it does

  • Speech-to-speech translation
  • Translating and transcribing recordings
  • Streaming translation

Where it is used

ResearchEducationNon-commercial projects

Hardware requirements

LaptopLaptop or regular PC, up to 8 GB of VRAM — smaller versions
fits
1 GPUOne GPU with 16–80 GB — mid-size versions
fits
ClusterServer with several GPUs — flagship versions
no versions

Versions

  1. SeamlessM4T v2, Seamless Expressive и Streaming
  2. SeamlessM4T (medium, large)

How to run it

On your own serverWeights are downloaded from Hugging Face and served with vLLM (load and API) or llama.cpp (modest hardware). The model then runs in a closed network with no per-request fees.Hugging Face
How much hardware you needCalculate the VRAM for the model size, context length and number of concurrent requests.Open the hardware calculator

I can set this up end to end: pick the model size, deploy it on your server and connect it to your systems.

Frequently asked questions

Can SeamlessM4T / Seamless be used in a commercial project?

No. License: CC BY-NC 4.0, non-commercial use only. A commercial product needs a different model or a separate agreement with the rights holder.

What hardware does SeamlessM4T / Seamless need?

At minimum: Laptop or regular PC, up to 8 GB of VRAM — smaller versions. Without a GPU the model is not practical. You can calculate the exact VRAM for your model size and context in the hardware calculator.

Does SeamlessM4T / Seamless support Russian?

Yes, Russian is listed on the model card.

Where can I download SeamlessM4T / Seamless and what does it cost?

The SeamlessM4T / Seamless weights are open and free to download. You only pay for the hardware it runs on and for the setup. Source links are at the bottom of this page.

How I deploy it for clients

  1. SelectionI pick the model size for your task and hardware and test it on your examples.
  2. DeploymentI deploy it on your server or in a closed network and provide an API.
  3. Fine-tuningI fine-tune it on your data (LoRA) or connect a knowledge base — whichever is cheaper for the task.
  4. IntegrationI connect it to your CRM, ERP, bot, website or team chat and set up monitoring.

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Details

Source: huggingface.co/facebook/seamless-m4t-v2-large. Data checked against the model card on 22 Sep 2026. Have a lawyer review the license before commercial launch.