Cost-Efficient RAG for Entity Matching with LLMs: A Blocking-based Exploration

• URL: http://arxiv.org/abs/2602.05708v1
• Date: Thu, 05 Feb 2026 14:33:00 GMT
• Title: Cost-Efficient RAG for Entity Matching with LLMs: A Blocking-based Exploration
• Authors: Chuangtao Ma, Zeyu Zhang, Arijit Khan, Sebastian Schelter, Paul Groth,
• Abstract summary: Existing RAG pipelines incur substantial retrieval and generation overhead when applied to large-scale entity matching.<n>We introduce CE-RAG4EM, a cost-efficient RAG architecture that reduces computation through blocking-based batch retrieval and generation.
• Score: 14.88759517020146
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Retrieval-augmented generation (RAG) enhances LLM reasoning in knowledge-intensive tasks, but existing RAG pipelines incur substantial retrieval and generation overhead when applied to large-scale entity matching. To address this limitation, we introduce CE-RAG4EM, a cost-efficient RAG architecture that reduces computation through blocking-based batch retrieval and generation. We also present a unified framework for analyzing and evaluating RAG systems for entity matching, focusing on blocking-aware optimizations and retrieval granularity. Extensive experiments suggest that CE-RAG4EM can achieve comparable or improved matching quality while substantially reducing end-to-end runtime relative to strong baselines. Our analysis further reveals that key configuration parameters introduce an inherent trade-off between performance and overhead, offering practical guidance for designing efficient and scalable RAG systems for entity matching and data integration.

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