---
title: "Discussion on \"Agentic RAG costs 2.5x classic RAG: the 2026 routing decision\" | Hashnode"
description: "Discussion on \"Agentic RAG costs 2.5x classic RAG: the 2026 routing decision\". Agentic RAG costs 2.5x classic RAG: the 2026 routing decision\nSummary. Agentic RAG is not a free upgrade over classic retrieval. In the RAGRouter-Bench measurements published by Wang and colleagues in"
url: "https://hashnode.com/posts/agentic-rag-costs-25x-classic-rag-the-2026-routing-decision/6a685a348947a3237f8a9d34"
---

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# [Agentic RAG costs 2.5x classic RAG: the 2026 routing decision](https://ecorpit.hashnode.dev/agentic-rag-costs-25x-classic-rag-the-2026-routing-decision?utm_source=hashnode&utm_medium=feed)

Agentic RAG costs 2.5x classic RAG: the 2026 routing decision Summary. Agentic RAG is not a free upgrade over classic retrieval. In the RAGRouter-Bench measurements published by Wang and colleagues in

Jul 28 · 14 min read · ecorpit.hashnode.dev  
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## Written by

[Manu Shukla](https://hashnode.com/@mr-manushukla)

@mr-manushukla · Delhi, India

  
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Founder and Director of eCorpIT

## Responses 1

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[Kartik N V J K](https://hashnode.com/@kartik-nvj)

[Jul 28](https://hashnode.com/posts/agentic-rag-costs-25x-classic-rag-the-2026-routing-decision/6a685a348947a3237f8a9d34/comment/6a68fec92a87ab09072ef1e5)

Reframing classic versus agentic as a per-query routing decision rather than a global architecture choice is the right move, and a classifier at 93.2% accuracy cutting 28.1% of tokens is a convincing enough number to act on. The part I would stress-test is the asymmetry of the routing errors, since sending a genuinely multi-hop query down the cheap single-pass path costs you a correct answer, while the reverse only costs tokens. Did the RAGRouter-Bench numbers report routing accuracy per query type, because the tail of hard queries is where that 6.8% miss rate actually bites?