Does Visual Rendering Bypass Tokenization? Investigating Script-Tokenizer Misalignment in Pixel-Based Language Models

• URL: http://arxiv.org/abs/2602.06973v1
• Date: Mon, 12 Jan 2026 07:37:46 GMT
• Title: Does Visual Rendering Bypass Tokenization? Investigating Script-Tokenizer Misalignment in Pixel-Based Language Models
• Authors: Lucky Susanto, Musa Izzanardi Wijanarko, Khumaisa Nur'aini, Farid Adilazuarda, Alham Fikri Aji, Derry Tanti Wijaya,
• Abstract summary: multimodal variants such as DualGPT reintroduce text tokenizers to improve autoregressive performance.<n>We investigate a fundamental question, does visual rendering truly decouple a model from tokenization constraints?<n>Our results show that, despite visual rendering, reintegrating a text tokenizer into the architecture reintroduces the same issue that pixel-based language modeling aims to resolve.
• Score: 20.181240222544208
• License: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Abstract: While pixel-based language modeling aims to bypass the sub-word tokenization bottleneck by rendering text as images, recent multimodal variants such as DualGPT reintroduce text tokenizers to improve autoregressive performance. We investigate a fundamental question, does visual rendering truly decouple a model from tokenization constraints? Focusing on four Indonesian low-resource local languages that have their own non-Latin scripts (i.e., Javanese, Balinese, Sundanese, and Lampungnese), we evaluate the impact of script-tokenizer alignment within the DualGPT architecture. Our results show that, despite visual rendering, reintegrating a text tokenizer into the architecture reintroduces the same issue that pixel-based language modeling aims to resolve, which is the tokenizer misalignment problem. Despite having lower OOV and fertility rates, we show that the Llama 2 tokenizer performs significantly worse than a custom tokenizer, with improvements of up to 30.15 chrF++. Our findings serve as a warning for future multimodal variants, as text tokenizers remain a significant barrier to equitable models.

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