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Try now ↗ ENTERPRISE Research COMPANY Get API Blog / Breaking Down Model Vocabulary Barriers Breaking Down Model Vocabulary Barriers Charles Goddard , Fernando Fernandes Neto , Julien Simon , • June 10, 2025 A training-free method to transplant tokenizers in pre-trained language models At Arcee AI, we're constantly pushing the boundaries of what's possible with small language models (SLMs). Today, we're excited to share groundbreaking research that solves one of the most persistent challenges in AI model development: making different language models work together, even when they have different vocabularies. When Models Can't Talk to Each Other Imagine you have two brilliant translators—one specializes in medical terminology, the other in legal jargon. Both are experts, but they use completely different vocabularies. If you want them to collaborate on a document that requires both medical and legal expertise, they'd struggle to communicate effectively. This is exactly what happens with language models. 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