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Portrait of Koki Itai

Koki Itai

Research Engineer at SB Intuitions Corp.

Work Experience

SB Intuitions Corp.
Research Engineer
2026.04 – Present
Research Engineer (Internship)
2025.04 – 2026.03
neoAI Inc.
AI Engineer (Internship)
2024.02 – 2026.03
Hitachi, Ltd.
Research & Development (Internship)
2024.09 – 2024.10
LY Corporation
AI Engineer (Internship)
2024.08 – 2024.09
Nuco, Inc.
Machine Learning Engineer (Internship)
2023.02 – 2024.05

Education

Tokyo Metropolitan University
M.S. in Computer Science, Graduate School of System Design
2024.04 – 2026.03
B.S. in Computer Science, Faculty of System Design
2020.04 – 2024.03
Tokyo Metropolitan Tama Science and Technology High School
2017.04 – 2020.03

Publications

International Conference

  • LIT-RAGBench: Benchmarking Generator Capabilities of Large Language Models in Retrieval-Augmented Generation LREC 2026
    Koki Itai, Shunichi Hasegawa, Yuta Yamamoto, Gouki Minegishi, Masaki Otsuki
    arXiv GitHub GitHub
  • Proposal of Modeling Personal Values Using Large Language Models for Extracting Mentions of Item Attributes and Evaluation Polarity from Review Texts TAAI 2024
    Koki Itai, Hiroki Shibata, Yasufumi Takama
    Paper Poster GitHub GitHub

Domestic Conference / Symposium

  • Automatic Synthesis of Japanese Multi-hop QA Dataset Based on Knowledge Graphs for Agentic RAG The 32nd Annual Meeting of the Association for Natural Language Processing (NLP2026)
    Koki Itai, Koji Matsuda, Shigehiko Fukuchi
    Paper Poster Hugging Face
  • neoAI-InstructBench: A Japanese Composite Instruction-Following Benchmark Based on Practical Scenarios The 32nd Annual Meeting of the Association for Natural Language Processing (NLP2026)
    Toshiki Kawamoto, Koki Itai, Masaki Otsuki
    Paper Poster GitHub GitHub
  • Construction of Generator Evaluation Benchmark for Japanese RAG The 265th Natural Language Processing Research Meeting
    Koki Itai, Shunichi Hasegawa, Yuta Yamamoto, Gouki Minegishi, Masaki Otsuki
    Paper Slide
  • Training Japanese Agentic RAG Model Based on Chain of Abstraction The 20th Natural Language Processing Symposium for Young Researchers
    Koki Itai, Masaya Ohagi, Akihiko Fukuchi
    Poster Movie
  • Proposal of Value Modeling from Review Text Using Large Language Models The 38th Annual Conference of the Japanese Society for Artificial Intelligence
    Koki Itai, Hiroki Shibata, Yasufumi Takama
    Paper
  • Preliminary Study on Value Model Construction from Review Text Using Large Language Models The 19th Web Intelligence and Interaction Research Meeting (ARG SIG-WI2)
    Koki Itai, Hiroki Shibata, Yasufumi Takama
    Paper

Awards

The 20th Natural Language Processing Symposium for Young Researchers Demo Award
2025
GENIAC Matsuo Lab LLM Development Project 3rd Place
2024
Tokyo Metropolitan University Outstanding Academic Performance Award (GPA: 3.66)
2024
Tokyo Metropolitan University Outstanding Academic Performance Award (GPA: 3.63)
2023
NICT Open House 2019 Student Encouragement Award
2019
High school senior; research on a YOLO v3-based climber detection system for mountain accident prevention

Others

Talks

speakerdeck.com 最先端NLP勉強会2026: Self-Distillation Enables Continual Learning sansan.connpass.com 【Sansan × IVRy】 NLP2026 参加報告会 neoai.connpass.com neoAI Meetup #1 LLMのポテンシャルを引き出す基礎技術

Media

sbintuitions.co.jp 国産LLM Sarashina3.2 mini thinking の紹介 note.com 【新卒エンジニア座談会】入社半年の4人が語る、現在地とSB Intuitionsで描く未来 neoai.jp 株式会社neoAI、国際会議「LREC 2026」にてRAG評価ベンチマーク「LIT-RAGBench」を発表 huggingface.co neoai-inc/neoAI-JP-QwQ-32B intel.co.jp Intel Customer Story: neoAI が Intel Gaudi 3 AI アクセラレータを採用 prtimes.jp あおぞら銀行 x neoAI オンプレミス型次世代AI基盤構築に向けて、金融・行内特化LLMを開発 prtimes.jp オンプレミス導入も可能な高性能日本語LLM「Llama 3 neoAI 8B Chat v0.1」を公開 tmu.ac.jp 社会の課題を見つけ、価値創出の足がかりに