[2610.18861] Hybrid Reasoning Agents (https://arxiv.org/static/browse/0.3.4/images/icons/apple-touch-icon.png) (../static/browse/0.3.4/images/icons/favicon-32x32.png) (../static/browse/0.3.4/images/icons/favicon-16x16.png) (../static/browse/0.3.4/images/icons/site.webmanifest) (https://arxiv.org/static/browse/0.3.4/images/icons/safari-pinned-tab.svg) (../static/browse/0.3.4/css/arXiv.css@v=20260318.css)  (../static/browse/0.3.4/css/arXiv-print.css@v=20260924.css)  (../static/browse/0.3.4/css/browse_search.css)  (../static/base/1.0.1/css/arxiv-header-footer.css@v=20260929.css)  (2610.18861.html)                  (../static/browse/0.3.4/css/tooltip.css)  (../../static.arxiv.org/js/bibex-dev/bibex.css@20200709.css)                 (2610.18861.html#content) Skip to main content (https://arxiv.org/IgnoreMe)  (https://arxiv.org/) (archive)       (https://arxiv.org/search)    Search  (https://arxiv.org/user/create) Submit (https://info.arxiv.org/about/donate.html) Donate  (https://arxiv.org/login) Log in   Search arXiv (Search papers by title, author, abstract, or ID...) (all) (header)  Press Enter to search · (https://arxiv.org/search/advanced) Advanced search    Computer Science > Computation and Language  arXiv:2610.18861 (cs)  (../static/base/1.0.1/css/abs.css) [Submitted on 13 Oct 2026] Title: Hybrid Reasoning Agents Authors: (https://arxiv.org/search/cs?searchtype=author&query=Zou,+J) Jiaru Zou , (https://arxiv.org/search/cs?searchtype=author&query=Qi,+Y) Yunzhe Qi , (https://arxiv.org/search/cs?searchtype=author&query=Chen,+S) Sirui Chen , (https://arxiv.org/search/cs?searchtype=author&query=Bianchi,+F) Federico Bianchi , (https://arxiv.org/search/cs?searchtype=author&query=Zhu,+S) Shang Zhu , (https://arxiv.org/search/cs?searchtype=author&query=Lu,+P) Pan Lu , (https://arxiv.org/search/cs?searchtype=author&query=He,+J) Jingrui He , (https://arxiv.org/search/cs?searchtype=author&query=Zou,+J) James Zou  View a PDF of the paper titled Hybrid Reasoning Agents, by Jiaru Zou and 7 other authors (https://arxiv.org/pdf/2610.18861) View PDF (https://arxiv.org/html/2610.18861v1) HTML (experimental) Abstract: How can we build an agent that thinks beyond human language, yet still acts through it in the external environment? Modern LLM agents still reason and interact through text, while latent reasoning offers an efficient internal medium but lacks native tool access and reasoning transparency. We bridge these two directions with Hybrid Reasoning Agents (HybridAgents), which dynamically navigate between latent reasoning and text-based interaction throughout a unified generation process. Architecturally, a lightweight HybridLink enables seamless transitions between text and latent modes, while the agent's continuous working memory preserves lossless hybrid context across multiple turns. These designs preserve tool-integrated agentic capabilities while making latent thoughts directly inspectable. Building on this architecture, we further develop dedicated post-training algorithms for hybrid reasoning: HybridSFT stabilizes tool-integrated hybrid generation by teaching the backbone to coordinate with HybridLink, then HybridRL scales reasoning by learning when to think in latent space and when to act through text. We evaluate HybridAgent at 3 model scales across 11 benchmarks covering mathematics, science, medicine, search, and agentic reasoning. Compared with frontier LLM Agents and agentic frameworks spanning both text-based and latent methods, HybridAgent consistently improves performance by 10.4%, while delivering 35.5%-54.7% token reduction, 1.8x-2.6x faster inference, and 2.7x-3.7x cost savings. Code and data are available at (https://github.com/togethercomputer/HybridAgent) this https URL .  Comments: 45 pages, 12 figures  Subjects: Computation and Language (cs.CL) ; Artificial Intelligence (cs.AI); Machine Learning (cs.LG)  Cite as: (2610.18861.html) arXiv:2610.18861 [cs.CL]    (or (https://arxiv.org/abs/2610.18861v1) arXiv:2610.18861v1 [cs.CL] for this version)    (https://doi.org/10.48550/arXiv.2610.18861) https://doi.org/10.48550/arXiv.2610.18861   Focus to learn more   arXiv-issued DOI via DataCite (pending registration)        Submission history From: Jiaru Zou [(https://arxiv.org/show-email/d71dd478/2610.18861) view email ]  [v1] Tue, 13 Oct 2026 17:59:31 UTC (8,500 KB)    Full-text links: Access Paper: View a PDF of the paper titled Hybrid Reasoning Agents, by Jiaru Zou and 7 other authors (https://arxiv.org/pdf/2610.18861) View PDF  (https://arxiv.org/html/2610.18861v1) HTML (experimental)  (https://arxiv.org/src/2610.18861) TeX Source    (http://creativecommons.org/licenses/by/4.0/) (Rights to this article) (license icon)  view license    Additional Features (https://arxiv.org/audio/2610.18861) Audio Summary    Current browse context: cs.CL (https://arxiv.org/prevnext?id=2610.18861&function=prev&context=cs.CL) (previous in cs.CL (accesskey p)) < prev  |  (https://arxiv.org/prevnext?id=2610.18861&function=next&context=cs.CL) (next in cs.CL (accesskey n)) next >    (https://arxiv.org/list/cs.CL/new) new |  (https://arxiv.org/list/cs.CL/recent) recent |  (https://arxiv.org/list/cs.CL/2026-10) 2026-10  Change to browse by: (https://arxiv.org/abs/2610.18861?context=cs) cs (https://arxiv.org/abs/2610.18861?context=cs.AI) cs.AI (https://arxiv.org/abs/2610.18861?context=cs.LG) cs.LG    References & Citations (https://ui.adsabs.harvard.edu/abs/arXiv:2610.18861) NASA ADS  (https://scholar.google.com/scholar_lookup?arxiv_id=2610.18861) Google Scholar  (https://api.semanticscholar.org/arXiv:2610.18861) Semantic Scholar     export BibTeX citation Loading...  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