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TokEval: A Tokenizer Evaluation Suite

Meister 2026-08-18
Clara Meister

Language model tokenizers are typically selected with minimal evaluation, despite the fact that their design choices directly impact model capabilities. This can be partly attributed to a limited understanding of which tokenizer properties affect which aspects of downstream performance. We introduce TokEval, a framework of tokenizer evaluation metrics that goes beyond standard measures like fertil

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Key Contributions

  • Language model tokenizers are typically selected with minimal evaluation, despite the fact that their design choices directly impact model capabilities.
  • This can be partly attributed to a limited understanding of which tokenizer properties affect which aspects of downstream performance.
  • We introduce TokEval, a framework of tokenizer evaluation metrics that goes beyond standard measures like fertil

Research Themes

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