--- title: "Zexu Sun — author profile and papers — Elamur Research" description: "Zexu Sun, Renmin University of China: 2 papers on Elamur Research (2025–2026), h-index 0 — affiliations, topics, co-authors and who cites…" canonical: "https://research.elamur.ai/free/en/authors/zexu-sun/" --- [Elamur Research](https://md.research.elamur.ai/free/en/) · [this page in HTML](https://research.elamur.ai/free/en/authors/zexu-sun/) [home](https://md.research.elamur.ai/free/en/) / [authors](https://md.research.elamur.ai/free/en/authors/) / Zexu Sun # Zexu Sun Zexu Sun has 2 papers in our library, in 2025–2026, most of them on [Language models & pretraining](https://md.research.elamur.ai/free/en/topics/language-models/), [Reasoning](https://md.research.elamur.ai/free/en/topics/reasoning/); often with [Dugang Liu](https://md.research.elamur.ai/free/en/authors/dugang-liu/), [Erxue Min](https://md.research.elamur.ai/free/en/authors/erxue-min/), [Fuyuan Lyu](https://md.research.elamur.ai/free/en/authors/fuyuan-lyu/). 2 papers in our library · 2025–2026 [OpenAlex](https://openalex.org/A5139794759) · [**h-index 0**](https://openalex.org/authors/A5139794759) · [2 works](https://openalex.org/works?filter=author.id:A5139794759) · [0 citations](https://openalex.org/works?filter=author.id:A5139794759&sort=cited_by_count:desc) OpenAlex, 2026-10-14 [📄 2 works in our library](https://md.research.elamur.ai/free/en/authors/zexu-sun/#papers) · [🔗 Cited 76 times in our library](https://md.research.elamur.ai/free/en/authors/zexu-sun/cited-by/) · [⭐ Paper Stars ranking: #8371](https://md.research.elamur.ai/free/en/paper-stars/page/84/#star-8371) The profile is the library's match of the name; two people with one name are not always told apart. Elsewhere: [Google Scholar](https://scholar.google.com/citations?view_op=search_authors&mauthors=Zexu+Sun) · [Semantic Scholar](https://www.semanticscholar.org/search?q=Zexu+Sun) · [dblp](https://dblp.org/search?q=Zexu+Sun) · [ACL Anthology](https://aclanthology.org/search/?q=Zexu+Sun) ## Affiliations [🎓**Renmin University of China** Beijing · China 2026 · 1 paper*current*](https://md.research.elamur.ai/free/en/universities/renmin-university-of-china/) From the bylines of their papers (OpenAlex, 2026-10-14), ORCID and Wikidata; institutions on papers are matched by machine. ## Fields, topics and concepts Of its works in our library, with the number of works on each. 📚 Shelves 4 The field of science this work belongs to (OpenAlex fields).[Artificial Intelligence · 2 works](https://md.research.elamur.ai/free/en/shelves/computer-science/artificial-intelligence/) · [Arts and Humanities · 2 works](https://md.research.elamur.ai/free/en/shelves/arts-and-humanities/) · [Computer Science · 2 works](https://md.research.elamur.ai/free/en/shelves/computer-science/) · [Language and Linguistics · 2 works](https://md.research.elamur.ai/free/en/shelves/arts-and-humanities/language-and-linguistics/) 🧭 Topics 2 Research subjects and languages the work is about.[Language models & pretraining · 2 works](https://md.research.elamur.ai/free/en/topics/language-models/) · [Reasoning · 1 work](https://md.research.elamur.ai/free/en/topics/reasoning/) ## Works by year ### 2020s [**2026** 1 paper](https://md.research.elamur.ai/free/en/authors/zexu-sun/year/2026/) · [**2025** 1 paper](https://md.research.elamur.ai/free/en/authors/zexu-sun/year/2025/) ## Papers The most cited first (OpenAlex and our library). 1. **[A Survey on Test-Time Scaling in Large Language Models: What, How, Where, and How Well?](https://md.research.elamur.ai/free/en/papers/zhang-2025-survey-test-time-scaling-large/)** *(2025 · 79 citations)* Gains from enlarging pretraining data and model size are slowing, so research has shifted toward spending extra computation at inference. 2. **[Learning from Cognition: Enhancing RL Efficiency for LLM Reasoning via Hierarchical Metacognitive Decomposition and Refinement](https://md.research.elamur.ai/free/en/papers/sun-2026-learning-cognition-enhancing-rl-efficiency/)** *(2026)* Zero-RL training with verifiable rewards wastes much of its compute on weaker base LLMs. With a fixed prompt template, many problems yield no correct rollout, so accuracy-based filtering discards them. Cog-Rethinker tackles this by adding two cognition-inspired rollout stages on top of a DAPO-style pipeline. Problems… ## Co-authors here 12 of 13 co-authors with a page, the most papers together first. - [Dugang Liu](https://md.research.elamur.ai/free/en/authors/dugang-liu/) - [Erxue Min](https://md.research.elamur.ai/free/en/authors/erxue-min/) - [Fuyuan Lyu](https://md.research.elamur.ai/free/en/authors/fuyuan-lyu/) - [Haolun Wu](https://md.research.elamur.ai/free/en/authors/haolun-wu/) - [Irwin King](https://md.research.elamur.ai/free/en/authors/irwin-king/) - [Lei Wang](https://md.research.elamur.ai/free/en/authors/lei-wang/) - [Niklas Muennighoff](https://md.research.elamur.ai/free/en/authors/niklas-muennighoff/) - [Qiyuan Zhang](https://md.research.elamur.ai/free/en/authors/qiyuan-zhang/) - [Weixu Zhang](https://md.research.elamur.ai/free/en/authors/weixu-zhang/) - [Wenyue Hua](https://md.research.elamur.ai/free/en/authors/wenyue-hua/) - [Xu Chen](https://md.research.elamur.ai/free/en/authors/xu-chen/) - [Xue Liu](https://md.research.elamur.ai/free/en/authors/xue-liu/) ## Venues Where their works here were published, the most works first, with the editions of those that have a page. - [Annual Meeting of the Association for Computational Linguistics (ACL)](https://md.research.elamur.ai/free/en/venues/acl/): [ACL 2026](https://md.research.elamur.ai/free/en/venues/acl/2026/) ## Cited by Papers of our library cite their works 76 times (of the 149,439 papers whose bibliographies we read); [33 citing papers with a page here →](https://md.research.elamur.ai/free/en/authors/zexu-sun/cited-by/). Updated 2 November 2026