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Open-weight model · Sentence similarity

multi-qa-mpnet-base-dot-v1

by Sentence Transformers sentence-transformers/multi-qa-mpnet-base-dot-v1

This is a sentence-transformers model: It maps sentences & paragraphs to a 768 dimensional dense vector space and was designed for semantic search. It has been trained on 215M (question, answer) pairs from diverse sources.

Parameters109M
Context514
Weights3.8 GB
License
AccessOpen weights
Monthly Downloads1.6M

Runs On

What it takes to serve multi-qa-mpnet-base-dot-v1 (109M 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 0.3 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 0.1 GB 0.1 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 multi-qa-mpnet-base-dot-v1

The license field on this page is empty, the first thing to settle for multi-qa-mpnet-base-dot-v1. It maps sentences and paragraphs to 768-dimensional vectors for semantic search, trained by Sentence Transformers on 215M question and answer pairs including ms_marco and natural_questions. At 109M parameters it needs 0.3 GB at 16-bit and 0.1 GB at 4-bit, so the single MI300X our Index lists at $1.85 an hour is far more than it needs; it shares a card with the generator it feeds, and the 514-token input limit means you chunk documents first.

With no license listed, we would not put it into a commercial pipeline until the publisher's terms are confirmed; open access to the files is not permission to use them. Check the formats: the 28 files total 3.8 GB because safetensors, onnx, openvino and pytorch versions are included, and you need only one.

Model Card

This is a sentence-transformers model: It maps sentences & paragraphs to a 768 dimensional dense vector space and was designed for semantic search. It has been trained on 215M (question, answer) pairs from diverse sources. For an introduction to semantic search, have a look at: SBERT.net - Semantic Search Using this model becomes easy when you have sentence-transformers installed: Then you can use the model like this: Without sentence-transformers, you can use the model like this: First, you pass your input through the transformer model, then you have to apply the correct pooling-operation on-top of the contextualized word embeddings. Text Embeddings Inference (TEI) is a blazing fast…

Excerpt from the card by Sentence Transformers.

Configuration

Architecture
MPNetForMaskedLM
Context length (tokens)
514
Layers
12
Hidden size
768
Feed-forward size
3,072
Attention heads
12
Vocabulary size
30,527
Model type
mpnet

Identity and Version

Repository
sentence-transformers/multi-qa-mpnet-base-dot-v1
Publisher
Sentence Transformers
Task
Sentence similarity
Modality
Text
Library
sentence-transformers
Parameters
109M parameters
Languages
en
Revision
17997f24dca0df1a4fed68894fb0e1e133e60482
First published
2022-03-02
Last updated
2025-08-19

Files and Weights

28 files, 3.8 GB in total. The weights are 13 files totalling 3.8 GB in bin, onnx, safetensors.

Weights13 files · 3.8 GB
Configuration8 files · 40.8 KB
Tokenizer3 files · 697.9 KB
Documentation1 file · 9.9 KB
Other2 files · 1.2 MB
Repository1 file · 791 B
Every file
FileTypeSizeSHA-256
model.safetensorsWeights438.0 MB d0338d7385e2
onnx/model.onnxWeights435.8 MB dd2b2dcce9b4
onnx/model_O1.onnxWeights435.7 MB 44ade08ff5c7
onnx/model_O2.onnxWeights435.7 MB 78a8d3efbe1c
onnx/model_O3.onnxWeights435.7 MB fb826ef52612
onnx/model_O4.onnxWeights217.9 MB 0f6a2a10c8d7
onnx/model_qint8_arm64.onnxWeights110.1 MB b30b640c8766
onnx/model_qint8_avx512.onnxWeights110.1 MB b30b640c8766
onnx/model_qint8_avx512_vnni.onnxWeights110.1 MB b30b640c8766
onnx/model_quint8_avx2.onnxWeights110.2 MB 96b00f1e7e6b
openvino/openvino_model.binWeights435.6 MB 2a0cd47f057c
openvino/openvino_model_qint8_quantized.binWeights110.0 MB 365a9b02c703
pytorch_model.binWeights438.0 MB 9e1e76b7a067
1_Pooling/config.jsonConfiguration190 B
config.jsonConfiguration571 B
config_sentence_transformers.jsonConfiguration212 B
data_config.jsonConfiguration25.5 KB
modules.jsonConfiguration229 B
sentence_bert_config.jsonConfiguration53 B
special_tokens_map.jsonConfiguration239 B
train_script.pyConfiguration13.9 KB
README.mdDocumentation9.9 KB
openvino/openvino_model.xmlOther432.3 KB
openvino/openvino_model_qint8_quantized.xmlOther741.4 KB
.gitattributesRepository791 B
tokenizer.jsonTokenizer466.0 KB
tokenizer_config.jsonTokenizer363 B
vocab.txtTokenizer231.5 KB

License and Download

License
Not stated by the source
Access
Open weights, no gate
Download size
3.8 GB
Download from Sentence Transformers

Released by Sentence Transformers through its official repository on Hugging Face.

Built From

  • Trained on (disclosed) eli5
  • Trained on (disclosed) embedding-data/Amazon-QA
  • Trained on (disclosed) embedding-data/PAQ_pairs
  • Trained on (disclosed) embedding-data/QQP
  • Trained on (disclosed) embedding-data/WikiAnswers
  • Trained on (disclosed) flax-sentence-embeddings/stackexchange_xml
  • Trained on (disclosed) gooaq
  • Trained on (disclosed) ms_marco
  • Trained on (disclosed) natural_questions
  • Trained on (disclosed) search_qa
  • Trained on (disclosed) trivia_qa
  • Trained on (disclosed) yahoo_answers_topics

Memory Requirements

PrecisionWeights in memory
As published3.8 GB
16-bit0.2 GB
8-bit0.1 GB
4-bit0.1 GB

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

Compare multi-qa-mpnet-base-dot-v1

Questions About multi-qa-mpnet-base-dot-v1

How much GPU memory does multi-qa-mpnet-base-dot-v1 need?

About 0.3 GB at 16-bit and 0.1 GB at 4-bit: the weights (109M parameters) plus a working margin. A long context needs more.

What is the cheapest GPU to run multi-qa-mpnet-base-dot-v1 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.

What is multi-qa-mpnet-base-dot-v1's context length?

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

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