EXAONE 4.0: Unified Large Language Models Integrating Non-reasoning and
  Reasoning Modes
Authors: name: LG AI Research; name: Kyunghoon Bae; name: Eunbi Choi; name: Kibong Choi; name: Stanley Jungkyu Choi; name: Yemuk Choi; name: Kyubeen Han; name: Seokhee Hong; name: Junwon Hwang; name: Taewan Hwang; name: Joonwon Jang; name: Hyojin Jeon; name: Kijeong Jeon; name: Gerrard Jeongwon Jo; name: Hyunjik Jo; name: Jiyeon Jung; name: Euisoon Kim; name: Hyosang Kim; name: Jihoon Kim; name: Joonkee Kim; name: Seonghwan Kim; name: Soyeon Kim; name: Sunkyoung Kim; name: Yireun Kim; name: Yongil Kim; name: Youchul Kim; name: Edward Hwayoung Lee; name: Gwangho Lee; name: Haeju Lee; name: Honglak Lee; name: Jinsik Lee; name: Kyungmin Lee; name: Sangha Park; name: Young Min Paik; name: Yongmin Park; name: Youngyong Park; name: Sanghyun Seo; name: Sihoon Yang; name: Heuiyeen Yeen; name: Sihyuk Yi; name: Hyeongu Yun
Published: 2025-07-15 15:24:51

Abstract: This technical report introduces EXAONE 4.0, which integrates a Non-reasoning
mode and a Reasoning mode to achieve both the excellent usability of EXAONE 3.5
and the advanced reasoning abilities of EXAONE Deep. To pave the way for the
agentic AI era, EXAONE 4.0 incorporates essential features such as agentic tool
use, and its multilingual capabilities are extended to support Spanish in
addition to English and Korean. The EXAONE 4.0 model series consists of two
sizes: a mid-size 32B model optimized for high performance, and a small-size
1.2B model designed for on-device applications. The EXAONE 4.0 demonstrates
superior performance compared to open-weight models in its class and remains
competitive even against frontier-class models. The models are publicly
available for research purposes and can be easily downloaded via
https://huggingface.co/LGAI-EXAONE.