LLM Fine-Tuning vs RAG: When to Use Which

Posted on Sat 18 April 2026 in GenAI • Tagged with fine-tuning, rag, llm, retrieval-augmented-generation, ai, machine-learning, gpt

LLM Fine-Tuning vs RAG: When to Use Which

A practical decision framework for teams building with LLMs — with real trade-offs, cost analysis, and when to combine both

Table of Contents

The Core Question
What Is RAG?
What Is Fine-Tuning?
Head-to-Head Comparison
When to Choose RAG
When to Choose Fine-Tuning
When …

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