SoftBank Corp.’s Large Telecom Model—a Generative AI Foundation for the Telecom Industry— Evolved into a Domestic AI Model and Launched for Internal Use

SoftBank Corp. announced it evolved its “Large Telecom Model” (LTM)**1 a generative AI foundation model designed for the telecommunications industry, into a Japan-developed AI model by integrating “Sarashina”, a homegrown large language model (LLM) specialized in the Japanese language and developed by SoftBank subsidiary SB Intuitions Corp. (“SB Intuitions”). This evolution enables secure, end-to-end data processing entirely within Japan. Leveraging its vast proprietary network data and the expertise accumulated over years in network design, management, and operations, SoftBank has realized a secure and reliable generative AI foundation through training and inference within its own Japan-based data centers.

*1 For more details on the “Large Telecom Model”, please refer to the press release dated March 19, 2025, titled “Development of “Large Telecom Model” (LTM), a Generative AI Foundation Model for the Telecommunications Industry”.

Read the full press release here.
https://www.softbank.jp/en/corp/news/press/sbkk/2025/20251029_01/