Japanese-specialized LLM landscape as of April 2026. Nine models including LLM-jp-4, PLaMo, Nemotron Nano 9B JP, Swallow, and Namazu — broken down by training approach (scratch / continued pre-training / post-training), size, license, and benchmark scores. What 'Japanese-specialized' actually means in each case.
NVIDIA has released Nemotron-Nano-9B-v2-Japanese. It takes first place in the sub-10B category on Nejumi Leaderboard 4, delivering strong performance in Japanese knowledge, QA, and tool calling.
