EXAONE 4.5 Technical Report
Authors: name: Eunbi Choi, name: Kibong Choi, name: Sehyun Chun, name: Seokhee Hong, name: Junwon Hwang, name: Hyojin Jeon, name: Ahra Jo, name: Hyunjik Jo, name: Yeonsik Jo, name: Joonkee Kim, name: Seonghwan Kim, name: Soyeon Kim, name: Sunkyoung Kim, name: Yireun Kim, name: Yongil Kim, name: Changhun Lee, name: Haeju Lee, name: Jinsik Lee, name: Kyungmin Lee, name: Sangha Park, name: Kwangrok Ryoo, name: Minju Seo, name: Sejong Yang, name: Heuiyeen Yeen, name: Hwan Chang, name: Stanley Jungkyu Choi, name: Yejin Choi, name: Kyubeen Han, name: Joonwon Jang, name: Kijeong Jeon, name: Geunyeong Jeong, name: Gerrard Jeongwon Jo, name: Jiyeon Jung, name: Daeseong Kim, name: Dohoon Kim, name: Dohyun Kim, name: Hyunseo Kim, name: Minu Kim, name: Myoungshin Kim, name: Youchul Kim, name: Byungoh Ko, name: Christopher Lee, name: Edward Hwayoung Lee, name: Honglak Lee, name: Jiyoung Lee, name: Sangeun Lee, name: Seungwon Lim, name: Woohyung Lim, name: Jueun Mun, name: Jaewoo Park, name: Jimin Park, name: Jinho Park, name: Yongmin Park, name: Wooseok Seo, name: Yongwoo Song, name: Sihyuk Yi, name: Kyungjae Yoo, name: Sangyeon Yoon
Organization: LG AI Research

This technical report introduces EXAONE 4.5, the first open-weight vision language model released by LG AI Research. EXAONE 4.5 is architected by integrating a dedicated visual encoder into the existing EXAONE 4.0 framework, enabling native multimodal pretraining over both visual and textual modalities. The model is trained on large-scale data with careful curation, particularly emphasizing document-centric corpora that align with LG's strategic application domains. This targeted data design enables substantial performance gains in document understanding and related tasks, while also delivering broad improvements across general language capabilities. EXAONE 4.5 extends context length up to 256K tokens, facilitating long-context reasoning and enterprise-scale use cases. Comparative evaluations demonstrate that EXAONE 4.5 achieves competitive performance in general benchmarks while outperforming state-of-the-art models of similar scale in document understanding and Korean contextual reasoning. As part of LG's ongoing effort toward practical industrial deployment, EXAONE 4.5 is designed to be continuously extended with additional domains and application scenarios to advance AI for a better life.