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Open-weight model · Speech recognition

seamless-m4t-v2-large

by AI at Meta facebook/seamless-m4t-v2-large

SeamlessM4T is our foundational all-in-one Massively Multilingual and Multimodal Machine Translation model delivering high-quality translation for speech and text in nearly 100 languages.

Parameters2.3B
Context4,096
Weights29.9 GB
Licensecc-by-nc-4.0
AccessOpen weights
Monthly Downloads306.7k

Runs On

What it takes to serve seamless-m4t-v2-large (2.3B parameters): the memory its weights need at each precision, and the cheapest way to rent enough data-center GPUs to hold them.

PrecisionWeightsMemory neededCheapest setupPer hourAlso fits
16-bit 4.6 GB 5.5 GB 1x MI300X (192 GB)
Vultr
$1.85 1x H100 $1.99 · 1x MI325X $2.00
8-bit 2.3 GB 2.8 GB 1x MI300X (192 GB)
Vultr
$1.85 1x H100 $1.99 · 1x MI325X $2.00
4-bit 1.2 GB 1.4 GB 1x MI300X (192 GB)
Vultr
$1.85 1x H100 $1.99 · 1x MI325X $2.00

Memory is the weights at that precision plus 20% for the runtime and a short context; a long context needs more. Prices are the lowest on-demand hourly rates in the SAVRN Index, read Sep 18, 2026.

Model Card

SeamlessM4T is our foundational all-in-one Massively Multilingual and Multimodal Machine Translation model delivering high-quality translation for speech and text in nearly 100 languages. SeamlessM4T models support the tasks of: - Automatic speech recognition (ASR). - 101 languages for speech input. - 96 Languages for text input/output. - 35 languages for speech output. We are releasing SeamlessM4T v2, an updated version with our novel UnitY2 architecture. This new model improves over SeamlessM4T v1 in quality as well as inference speed in speech generation tasks. The v2 version of SeamlessM4T is a multitask adaptation of our novel UnitY2 architecture. Unity2 with its hierarchical…

Excerpt from the card by AI at Meta, licensed cc-by-nc-4.0.

Configuration

Architecture
SeamlessM4Tv2Model
Context length (tokens)
4,096
Layers
24
Hidden size
1,024
Attention heads
16
Vocabulary size
256,102
Stored precision
float32
Model type
seamless_m4t_v2

Identity and Version

Repository
facebook/seamless-m4t-v2-large
Publisher
AI at Meta
Task
Speech recognition
Modality
Audio
Library
transformers
Parameters
2.3B parameters
Languages
af, am, ar, as, az, be, bn, bs
Revision
5f8cc790b19fc3f67a61c105133b20b34e3dcb76
First published
2023-11-29
Last updated
2024-01-04

Files and Weights

18 files, 29.9 GB in total. The weights are 5 files totalling 29.9 GB in pt, safetensors.

Weights5 files · 29.9 GB
Configuration6 files · 10.1 MB
Tokenizer2 files · 5.2 MB
Documentation1 file · 15.8 KB
Other3 files · 5.6 MB
Repository1 file · 1.5 KB
Every file
FileTypeSizeSHA-256
m4t_v2_multitask_unity2.ptWeights11.4 GB 2ebd8fe5fbf9
model-00001-of-00002.safetensorsWeights5.0 GB 85cab984fbc1
model-00002-of-00002.safetensorsWeights4.2 GB 9536dc05892a
seamlessM4T_v2_large.ptWeights9.1 GB f2122cedcffc
vocoder_v2.ptWeights167.8 MB 20c50c3edd3f
added_tokens.jsonConfiguration2.1 KB
config.jsonConfiguration2.7 KB
generation_config.jsonConfiguration9.9 MB
model.safetensors.index.jsonConfiguration210.7 KB
preprocessor_config.jsonConfiguration1.8 KB
special_tokens_map.jsonConfiguration2.3 KB
README.mdDocumentation15.8 KB
seamlessm4t_arch.svgOther50.1 KB
sentencepiece.bpe.modelOther5.2 MB 026a76827537
spm_char_lang38_tc.modelOther368.9 KB 9e7f2075dbc3
.gitattributesRepository1.5 KB
tokenizer.modelTokenizer5.2 MB 026a76827537
tokenizer_config.jsonTokenizer19.7 KB

License and Download

License
cc-by-nc-4.0
Access
Open weights, no gate
Download size
29.9 GB
Download from AI at Meta

Released by AI at Meta through its official repository on Hugging Face. Read the license.

Built From

Memory Requirements

PrecisionWeights in memory
As published29.9 GB
16-bit4.6 GB
8-bit2.3 GB
4-bit1.2 GB

Weights only, from the published parameter count; the key-value cache and runtime add to this.

Compare seamless-m4t-v2-large

Questions About seamless-m4t-v2-large

How much GPU memory does seamless-m4t-v2-large need?

About 5.5 GB at 16-bit and 1.4 GB at 4-bit: the weights (2.3B parameters) plus a working margin. A long context needs more.

What is the cheapest GPU to run seamless-m4t-v2-large on?

At 16-bit, 1x MI300X from $1.85 an hour; at 4-bit, 1x MI300X from $1.85 an hour, at the lowest on-demand prices the SAVRN Index lists.

Can I use seamless-m4t-v2-large commercially?

Not without separate permission. seamless-m4t-v2-large is released under Creative Commons Attribution-NonCommercial 4.0. CC BY-NC 4.0 permits sharing and adapting with credit for non-commercial purposes only. Commercial use needs separate permission from the rights holder.

What is seamless-m4t-v2-large's context length?

4,096 tokens, from the maximum position embeddings in its published configuration.

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