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Open-weight model · Translation

opus-mt-fr-en

by Helsinki-NLP Research Group Helsinki-NLP/opus-mt-fr-en

source languages: fr; target languages: en; OPUS readme: fr-en; dataset: opus; model: transformer-align; pre-processing: normalization + SentencePiece.

Parameters75M
Context512
Weights1.2 GB
Licenseapache-2.0
AccessOpen weights
Monthly Downloads860.9k

Runs On

What it takes to serve opus-mt-fr-en (75M 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 0.2 GB 0.2 GB 1x MI300X (192 GB)
Vultr
$1.85 1x H100 $1.99 · 1x MI325X $2.00
8-bit 0.1 GB 0.1 GB 1x MI300X (192 GB)
Vultr
$1.85 1x H100 $1.99 · 1x MI325X $2.00
4-bit 0.0 GB 0.0 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.

SAVRN's Notes on opus-mt-fr-en

French in, English out, nothing else. That narrow job is why this 75M-parameter Marian model from the Helsinki-NLP Research Group needs 0.2 GB of memory at 16-bit and 0.1 GB at 8-bit. Against the cheapest card in our table, a 192 GB MI300X at $1.85 an hour, the card is the wrong unit; size a deployment by how many translation streams one card carries. The 512-token window means long documents get split before they go in.

The license is Apache 2.0: commercial use, modification and redistribution are all permitted, with the license and copyright notices kept. Check two things. The repository ships safetensors, pytorch, jax and tf formats and weighs 1.2 GB on disk while the loaded 16-bit weights are 0.2 GB, so pull only the format you serve. And the weights date to March 2022, last touched November 2025, trained on the OPUS corpus, so test your own domain text first.

Model Card

By Helsinki-NLP Research Group, published under apache-2.0, revision c4aed37b318c.

source languages: fr; target languages: en; OPUS readme: fr-en; dataset: opus; model: transformer-align; pre-processing: normalization + SentencePiece.

Read Helsinki-NLP Research Group's full model card

Benchmarks

testset BLEU chr-F
newsdiscussdev2015-enfr.fr.en 33.1 0.580
newsdiscusstest2015-enfr.fr.en 38.7 0.614
newssyscomb2009.fr.en 30.3 0.569
news-test2008.fr.en 26.2 0.542
newstest2009.fr.en 30.2 0.570
newstest2010.fr.en 32.2 0.590
newstest2011.fr.en 33.0 0.597
newstest2012.fr.en 32.8 0.591
newstest2013.fr.en 33.9 0.591
newstest2014-fren.fr.en 37.8 0.633
Tatoeba.fr.en 57.5 0.720

Configuration

Architecture
MarianMTModel
Context length (tokens)
512
Layers
6
Vocabulary size
59,514
Model type
marian

Identity and Version

Repository
Helsinki-NLP/opus-mt-fr-en
Publisher
Helsinki-NLP Research Group
Task
Translation
Modality
Text
Library
transformers
Parameters
75M parameters
Languages
tf, jax, fr, en
Revision
c4aed37b318c763fd177aa449b44e3b783cc6c02
First published
2022-03-02
Last updated
2025-11-15

Files and Weights

12 files, 1.2 GB in total. The weights are 4 files totalling 1.2 GB in bin, h5, msgpack, safetensors.

Weights4 files · 1.2 GB
Configuration2 files · 1.7 KB
Tokenizer2 files · 1.3 MB
Documentation1 file · 1.2 KB
Other2 files · 1.6 MB
Repository1 file · 445 B
Every file
FileTypeSizeSHA-256
flax_model.msgpackWeights298.7 MB a791a29fc2ab
model.safetensorsWeights300.8 MB 6e3837f34b90
pytorch_model.binWeights300.8 MB 599b819e3488
tf_model.h5Weights301.3 MB 9ddf429085e4
config.jsonConfiguration1.4 KB
generation_config.jsonConfiguration293 B
README.mdDocumentation1.2 KB
source.spmOther802.4 KB
target.spmOther778.4 KB
.gitattributesRepository445 B
tokenizer_config.jsonTokenizer42 B
vocab.jsonTokenizer1.3 MB

License and Download

License
apache-2.0
Access
Open weights, no gate
Download size
1.2 GB
Download from Helsinki-NLP Research Group

Released by Helsinki-NLP Research Group through its official repository on Hugging Face. Read the license.

Memory Requirements

PrecisionWeights in memory
As published1.2 GB
16-bit0.2 GB
8-bit0.1 GB
4-bit0.0 GB

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

Compare opus-mt-fr-en

Questions About opus-mt-fr-en

How much GPU memory does opus-mt-fr-en need?

About 0.2 GB at 16-bit and 0 GB at 4-bit: the weights (75M parameters) plus a working margin. A long context needs more.

What is the cheapest GPU to run opus-mt-fr-en 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 opus-mt-fr-en commercially?

Yes. opus-mt-fr-en is released under Apache License 2.0. The Apache License 2.0 is a permissive open-source license. It permits commercial use, modification and redistribution. It requires keeping the license and copyright notices and any NOTICE file, stating significant changes, and it includes an express patent grant from contributors.

What is opus-mt-fr-en's context length?

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

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