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What challenges arise with multilingual LLMs, and why does tokenization penalize some languages?

Multilingual models are uneven across languages, and most candidates only name the obvious cause. The differentiator is the tokenizer: the same sentence can cost a non-English user several times the tokens. Here is the answer.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

Multilingual models are uneven across languages, and most candidates only name the obvious cause. The differentiator is the tokenizer: the same sentence can cost a non-English user several times the tokens. Here is the answer.

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