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When would you use fine-tuning vs RAG vs prompt engineering? How do you decide?

ML Concept: 5-7 minutes to answer

llm-engineeringfine-tuningragpromptingmust-know
Updated Jan 12, 2026

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Question

When would you use fine-tuning vs RAG vs prompt engineering? How do you decide?

Expected time to answer: 5-7 minutes

Difficulty: intermediate

Tags: llm-engineering fine-tuning rag prompting must-know

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