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Open-weight model · Speech recognition

whisper-ja-51M

by Efwkjn efwkjn/whisper-ja-51M

Whisper finetune for Japanese focused on general/anime domains. For usage instructions follow openai/whisper-large-v3-turbo. Due to vocab changes ctranslate2>=4.7.1 required for faster-whisper.

Parameters51M
Context
Weights102.7 MB
License
AccessOpen weights
Monthly Downloads41

Runs On

What it takes to serve whisper-ja-51M (51M 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 0.1 GB 0.1 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.

Model Card

Whisper finetune for Japanese focused on general/anime domains. For usage instructions follow openai/whisper-large-v3-turbo. Due to vocab changes ctranslate2>=4.7.1 required for faster-whisper. For inference engines with hardcoded vocab, the token embedding can be padded. Finetuned from base with pruned vocab and encoder conv adaption, indices can be found in mapping.txt. Trained decoder only for 2^20 steps, batch size 64. Using a 45000 hour corpus (largest source is 17000 of filtered reazonspeech-all) with custom mixing ratio and augmentation to maintain long form performance and timestamps. Benchmarks. Competitive for size on test sets, particually good on JSUT-book. Also trained for…

Excerpt from the card by Efwkjn.

Configuration

Architecture
WhisperForConditionalGeneration
Layers
6
Vocabulary size
10,240
Stored precision
float32
Model type
whisper

Identity and Version

Repository
efwkjn/whisper-ja-51M
Publisher
Efwkjn
Task
Speech recognition
Modality
Audio
Library
Not stated by the source
Parameters
51M parameters
Languages
ja
Revision
5b78f64cae04aa14d2be83e8ef5acc64e084657d
First published
2026-07-26
Last updated
2026-09-18

Files and Weights

15 files, 104.1 MB in total. The weights are 1 file totalling 102.7 MB in safetensors.

Weights1 file · 102.7 MB
Configuration6 files · 92.9 KB
Tokenizer4 files · 1.1 MB
Documentation2 files · 87.6 KB
Other1 file · 66.2 KB
Repository1 file · 1.5 KB
Every file
FileTypeSizeSHA-256
model.safetensorsWeights102.7 MB b5b176e4a398
added_tokens.jsonConfiguration33.3 KB
config.jsonConfiguration1.1 KB
generation_config.jsonConfiguration3.2 KB
normalizer.jsonConfiguration52.7 KB
preprocessor_config.jsonConfiguration340 B
special_tokens_map.jsonConfiguration2.2 KB
BENCH.mdDocumentation86.5 KB
README.mdDocumentation1.1 KB
mapping.txtOther66.2 KB
.gitattributesRepository1.5 KB
merges.txtTokenizer60.4 KB
tokenizer.jsonTokenizer614.7 KB
tokenizer_config.jsonTokenizer282.8 KB
vocab.jsonTokenizer146.6 KB

License and Download

License
Not stated by the source
Access
Open weights, no gate
Download size
102.7 MB
Download from Efwkjn

Released by Efwkjn through its official repository on Hugging Face.

Memory Requirements

PrecisionWeights in memory
As published102.7 MB
16-bit0.1 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.

Questions About whisper-ja-51M

How much GPU memory does whisper-ja-51M need?

About 0.1 GB at 16-bit and 0 GB at 4-bit: the weights (51M parameters) plus a working margin. A long context needs more.

What is the cheapest GPU to run whisper-ja-51M 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.

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Open weights mit whisperkit