• Oct. 9, 2025:
  🎉🏆 My paper was selected as a spotlight
  at the MELT Workshop in conjunction with COLM 2025.

• Sep. 17, 2025.
  🎉🏆 Receive the Special Jury Award
  at the YANS 2025 Hackathon!
  
  

• Sep. 2, 2025:
  🎉🏆 My presentation at the NL Workshop received
  the “IPSJ Yamashita SIG Research Award 2025.”
  
  

• Aug. 23, 2025:
  I gave a keynote speech at the High School Scientific Conference (HSSC)
  hosted by SMAN 10 BEKASI.
  
  

• Aug. 8, 2025:
  🎉 My paper was accepted at the MELT Workshop
  in conjunction with COLM 2025.
  
  

（Past news can be found here）

International Conferences and Symposia 🌏

First-Author Publications / Personal Activities

• Aug, 23. 2025:
  I gave a keynote speech at the High School Scientific Conference (HSSC) hosted by SMAN 10 BEKASI.
  
  

• Oct. 10, 2025:
  "Why We Build Local Large Language Models: An Observational Analysis from 35 Japanese and Multilingual LLM"
  Koshiro Saito, Sakae Mizuki, Masanari Ohi, Taishi Nakamura, Taihei Shiotani, Koki Maeda, Youmi Ma, Kakeru Hattori, Kazuki Fujii, Takumi Okamoto, Shigeki Ishida, Hiroya Takamura, Rio Yokota, Naoaki Okazaki. The 1st Workshop on Multilingual and Equitable Language Technologies (MELT) (in conjunction with The Second Conference On Language Modeling (COLM))
  🎉🏆 Selected as a spotlight! (Ref: Accepted submissions: https://melt-workshop.github.io/papers/.)
  
  

Co-Authored Publications

• Oct. 10, 2025:
  "Building Instruction-Tuning Datasets from Human-Written Instructions with Open-Weight Large Language Models."
  Youmi Ma, Sakae Mizuki, Kazuki Fujii, Taishi Nakamura, Masanari Ohi, Hinari Shimada, Taihei Shiotani, Koshiro Saito, Koki Maeda, Kakeru Hattori, Takumi Okamoto, Shigeki Ishida, Rio Yokota, Hiroya Takamura, Naoaki Okazaki. COLM2025.

Domestic Conferences and Symposia 🇯🇵

First-Author Publications / Personal Activities

• Sep. 17, 2025:
  🎉🏆 Receive the Special Jury Award at the YANS 2025 Hackathon!
  
  

• Sep. 6-7, 2024:
  "Easily detectable LLMs without sacrificing its generative capability" [Poster (JP)]
  Koshiro Saito [1], Ryuto Koike [1], Masahiro Kaneko[2], Naoaki Okazaki[1] (1: TITECH, 2: MBZUAI)
  🎉🏆 Won the ‘Encouragement Award’ and ‘Sponsor Award’ at YANS2024
  
  

• Sep. 3, 2024:
  "Advantages of Training LLMs on Japanese Text"[Paper (JP), Slides (JP)]
  Koshiro Saito [1], Sakae Mizuki [2,1], Masanari Ohi [1], Takashi Nakamura [1], Taihei Shiotani [1], Koki Maeda [1], Ma Youmi [1], Kakeru Hattori [1], Kazuki Fujii [1], Takumi Okamoto [1], Shigeki Ishida [1], Hiroya Takamura [2], Rio Yokota [1], Naoaki Okazaki [1] (1: TITECH, 2: AIST)
  🎉🏆 Awarded Excellence at the 261st NL Research Presentation
  🎉🏆 Awarded the “IPSJ Yamashita SIG Research Award 2025.”

Co-Authored Publications

• Mar. 2025:
  "模倣学習による大規模言語モデルの指示チューニング (Instruction Tuning of Large Language Models Through Imitation Learning)".
  Youmi Ma, Sakae Mizuki, Kazuki Fujii, Taishi Nakamura, Masanari Ohi, Hinari Shimada, Taihei Shiotani, Koshiro Saito, Koki Maeda, Kakeru Hattori, Takumi Okamoto, Shigeki Ishida, Rio Yokota, Hiroya Takamura, Naoaki Okazaki. The 31st Annual Meeting of the Association of Natural Language Processing (NLP2025), Nagasaki, Japan. (in Japanese).
  
  

• Mar. 2025:
  "新聞記事からつくる 時事と社会に強い日本語LLM (Japanese LLM Powered by News Articles: Strong in Current Events and Social Issues)".
  Kakeru Hattori, Sakae Mizuki, Kazuki Fujii, Taishi Nakamura, Taihei Shiotani, Kokoro Ueki, Takuro Niitsuma, Akira Kawabata, Hideaki Tamori, Youmi Ma, Koki Maeda, Masanari Ohi, Koshiro Saito, Takumi Okamoto, Shigeki Ishida, Rio Yokota, Hiroya Takamura, Naoaki Okazaki. The 31st Annual Meeting of the Association of Natural Language Processing (NLP2025), Nagasaki, Japan. (in Japanese).
  
  

• Mar. 2025:
  "Swallowコーパスv2: 教育的な日本語ウェブコーパスの構築 (Swallow Corpus v2: Building an Educational Japanese Web Corpus)". Kakeru Hattori, Naoaki Okazaki, Sakae Mizuki, Kazuki Fujii, Taishi Nakamura, Masanari Ohi, Taihei Shiotani, Koshiro Saito, Youmi Ma, Koki Maeda, Takumi Okamoto, Shigeki Ishida, Rio Yokota, Hiroya Takamura.  The 31st Annual Meeting of the Association of Natural Language Processing (NLP2025), Nagasaki, Japan. (in Japanese). 

• Apr. 2025 - Present:
  Research Assistant
  Okazaki Lab，Science Tokyo
  
  

• Apr. 2025 - Present:
  Teaching Assistant
  Center for DS & AI Education，Science Tokyo
  
  

• Jul. 2024 - Mar. 2025:
  Research Assistant
  Okazaki Lab，Tokyo Tech
  
  

• Feb. 2023 - Jun. 2025:
  Internship (R&D)
  Canserscan Inc.

I believe that LLM is the essential bridge that will enable
the realization of a symbiotic society between AI and humans.

• Watermark [Reinforcement Learning.] (Currently 🏃) 

  • Is it possible to make models detectable
    while keeping their abilities?

  • Is it possible to tell whether it is human-written
    or AI-generated, and when would it be useful?
    
    

• Models/Datasets Evaluation (Currently 🏃)

  • How & What to evaluate for 'better' models?

  • What are 'good' datasets?
    
    

• Services and business leveraging LLMs.
  (Actually, most interested in now 🔥)

  • How can we make LLMs so that
    everyone on Earth can access and enjoy their benefits?

  • Can LLMs serve society in any aspect
    other than Language and Generation?

• Apr. 2025 - Present:
  Master of Engineering (Computer Science)
  Institute of Science Tokyo
  
  

• Apr. 2021 - Mar. 2025:
  Bachelor of Engineering (Computer Science)
  Tokyo Institute of Technology

• Jul. 2024:

Scholarship 

by Keyence Foundation