What does this research mean for the field?

In Retrieval-Augmented Generation (RAG) systems, embedding model choice has a stronger effect on retrieval quality than chunk size, but retrieval performance is only weakly correlated with end-to-end answer generation quality. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

This research aims to analyze how chunk size and embedding model choice influence the quality and cost of RAG systems.

August 11, 2026Open Access

How Chunk Size and Embedding Model Choice Affect Retrieval-Augmented Generation Quality and Cost: A Controlled Comparison on Consumer Hardware

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Authors

AGAson Gautam

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Implication

Controlled comparison evaluates retrieval quality and indexing costs in retrieval-augmented generation systems, suggesting distinct trade-offs in quality and cost.

Key Points

This research aims to analyze how chunk size and embedding model choice influence the quality and cost of RAG systems.
Controlled 3 × 3 experiment evaluating three chunk sizes (128, 256, 512 words) and three embedding models
Used an 800-question subset of the Stanford Question Answering Dataset (SQuAD 1.1)
Measured retrieval and end-to-end performance using Recall@5, token-level F1, and Exact Match.
Embedding model choice significantly impacts retrieval quality; E5-small achieves the highest mean Recall@5 of 0.938.
Highest Recall@5 (0.946) obtained with 512-word chunks and E5-small.
Weak correlation (r = +0.12) between retrieval quality and generated answer quality, indicating different quality metrics.

Cite This Study

Ason Gautam (2026) studied this question.

synapsesocial.com/papers/6a7ace1a3401087f2249de0c https://doi.org/10.5281/zenodo.21863444

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Implication

Controlled comparison evaluates retrieval quality and indexing costs in retrieval-augmented generation systems, suggesting distinct trade-offs in quality and cost.

How Chunk Size and Embedding Model Choice Affect Retrieval-Augmented Generation Quality and Cost: A Controlled Comparison on Consumer Hardware

Discussion

Member takes

Implication

Key Points

Cite This Study

How Chunk Size and Embedding Model Choice Affect Retrieval-Augmented Generation Quality and Cost: A Controlled Comparison on Consumer Hardware

Discussion

Member takes

Implication

Key Points

Cite This Study

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