Research within a telecommunications group
NTT, Inc. is the holding company of the NTT Group, established on April 1, 1985. Its integrated report records the July 2025 change from Nippon Telegraph and Telephone Corporation. Its laboratories develop tsuzumi, while separate group companies deliver services using the model. [1][2][4]
A commercial model milestone
NTT announced the start of commercial tsuzumi services on March 25, 2024 through NTT Communications and NTT DATA. The offering emphasized Japanese-language tasks and customization for enterprise information. It was a commercial service launch, not a public-weight release. [3]
Why deployment details matter
NTT’s technical account describes on-premises, private-cloud and public-cloud options, with adapters for customer or industry requirements. That makes the implementation and operating environment part of the product. The model developer, service company and deployment configuration need to be identified separately when interpreting claims about cost, privacy or performance. [4]
Sources
- Corporate Data
NTT · retrieved Oct 23, 2026
- NTT Group Integrated Report 2025
NTT · 2025
- NTT版LLM「tsuzumi」商用開始！
NTT · Mar 25, 2024
- Commercialization of NTT’s LLM “tsuzumi”
NTT · Aug 2024