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Researchers decompose what makes tokenizers effective in language models

Lead author highlights finding on tokenizer merging strategy

Tiago Pimentel posted on X that the paper, submitted to EMNLP 2026, shows that BPE's step-by-step merging strategy is what matters, not its compression objective, challenging how tokenizers are typically compared.

Lead author highlights finding on tokenizer merging strategy
x.com

“Standard tokeniser comparisons (eg, BPE ⚔️ UnigramLM) conflate the two. Our #emnlp2026 paper separates tokenisation objective from search procedure and shows BPE's merging strategy is what matters”

Tiago Pimentel

Ahmetcan Yavuz Lead authorClara Meister Co-authorTiago Pimentel Co-author and lead communicator

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