HPCI users can log in with OAuth authentication.
For information on how to log in, please refer to the user manual "HPCI Login Manual OAuth Compatible Version" published by the HPCI Operations Office.
 

HPCI System Usage Information, Manuals, etc.
https://www.hpci-office.jp/en/for_users/hpci_info_manuals
- User’s Guide HPCI Login Manual For OAuth (HPCI-CA01-003E-01 *As of November 2025)

 
The HPC front-end server (octopus.hpc.osaka-u.ac.jp) can log in with OAuth.