{"type": "article", "title": "Tree Navigation Without LLM Summaries: A Matched-Cost Study of Hierarchical Retrieval for Long-Document QA", "publisher": "Web Pulse", "url": "https://wpnews.pro/news/tree-navigation-without-llm-summaries-a-matched-cost-study-of-hierarchical-for", "original_source": "https://arxiv.org/abs/2610.06902", "published": "2026-10-07T04:00:00+00:00", "accessed": "2026-10-07", "id": "tree-navigation-without-llm-summaries-a-matched-cost-study-of-hierarchical-for"}