Finding · P53 · Author-curated

APT4 needs more tokens per word than APT3 on all seven corpora and on both preamble texts.

Published by @stw2 · 2026-09-14 · Sources, measurements and interpretation are supplied by the author.

Structured assertion

Relation: Higher on a count of texts

metric: Fertility ratioQuantity compared.
subject: APT4 tokenizerTokenizer compared.
comparator: APT3 tokenizerTokenizer compared with.
count higher: 9 textsTexts where the subject's value is higher.
count total: 9 textsTexts compared.
texts: seven corpora; Polish preamble; English preambleTexts compared.

Experimental provenance

Method and evaluation protocol: Compare APT4 and APT3 tokens per word on each corpus and on the preamble protocol texts.
Dataset: Seven corpora and the preamble protocol texts.Version: unspecified · Access: restricted
Reported results: en-arxiv-abstracts: 2.462 against 2.439; en-latex-methods: 3.976 against 3.895; en-python-code: 6.626 against 6.329; en-gsm8k: 1.896 against 1.820; pl-science-pes: 1.957 against 1.778; pl-wiki-science: 2.026 against 1.856; pl-informal: 1.528 against 1.497; preamble-pl: 1.616 against 1.483; preamble-en: 1.984 against 1.943
Uncertainty and replication: Point values; per-corpus intervals are in results/atlas.json.
Evidence references: atlas.json · publichttps://github.com/stw2/tokenizer-science-tax/blob/719d51eb4ac7e6e0f36d69cf339c8e976266ee98/experiments/E01-fertility-atlas/results/atlas.jsonmetrics.json · publichttps://github.com/stw2/tokenizer-science-tax/blob/719d51eb4ac7e6e0f36d69cf339c8e976266ee98/experiments/E01-fertility-atlas/results/metrics.json
Limitations: APT4's training recipe is unpublished, so the cause is not identified.

Paper citations

arXiv:2604.10799v1 →Revision supplied by author

Associated through an explicitly referenced cited claim.

Concept definitions

Reuse the defining version and key when the meaning fits your assertion.

Higher on a count of texts

The subject's metric is higher than the comparator's on count_higher of count_total texts.

Key higher_on_count · version d12932ff-15a4-4030-ba68-04695fc77ae9

Concept JSON

APT3 tokenizer

Polish tokenizer introduced with the Polish APT3 model.

Key apt3 · version a59f02ac-4303-44b5-a5b0-5decab214308

Concept JSON · Defining publication

Fertility ratio

Average number of tokens required to represent a text.

Key fertility_ratio · version f3b88c39-b184-4cb7-85e6-916f260ad0ad

Concept JSON · Defining publication

APT4 tokenizer

Polish-optimised tokenizer of the Bielik v3 PL models.

Key apt4 · version d497f94d-5373-4652-887c-55c001b6472c

Concept JSON · Defining publication

Exact references

e150c2d5-b823-43d9-9440-5f6428448be1

APT4 extends APT3's design; its fertility is higher on every text measured.

Correct, supersede, retract or dispute

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