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Towards Agentic RAG with Deep Reasoning: A Survey of RAG-Reasoning Systems in LLMs

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arxiv 2507.09477 v2 pith:CUIB37BZ submitted 2025-07-13 cs.CL cs.AI

Towards Agentic RAG with Deep Reasoning: A Survey of RAG-Reasoning Systems in LLMs

classification cs.CL cs.AI
keywords reasoningllmsrag-reasoningagenticinferenceknowledgesurveysystems
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Retrieval-Augmented Generation (RAG) lifts the factuality of Large Language Models (LLMs) by injecting external knowledge, yet it falls short on problems that demand multi-step inference; conversely, purely reasoning-oriented approaches often hallucinate or mis-ground facts. This survey synthesizes both strands under a unified reasoning-retrieval perspective. We first map how advanced reasoning optimizes each stage of RAG (Reasoning-Enhanced RAG). Then, we show how retrieved knowledge of different type supply missing premises and expand context for complex inference (RAG-Enhanced Reasoning). Finally, we spotlight emerging Synergized RAG-Reasoning frameworks, where (agentic) LLMs iteratively interleave search and reasoning to achieve state-of-the-art performance across knowledge-intensive benchmarks. We categorize methods, datasets, and open challenges, and outline research avenues toward deeper RAG-Reasoning systems that are more effective, multimodally-adaptive, trustworthy, and human-centric. The collection is available at https://github.com/DavidZWZ/Awesome-RAG-Reasoning.

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