Fine-Tuning vs RAG vs Prompt Engineering: Decision Framework [2026]

Originally published at kunalganglani.com — read it there for inline code, hero image, and live links. Fine-Tuning vs RAG vs Prompt Engineering: Decision Framework [2026] Fine-tuning vs RAG vs prompt engineering is the decision every production LLM team faces in 2026 — and most teams get it wrong by treating these three techniques as competing alternatives on a single spectrum. They're not. Each solves a fundamentally different problem: fine-tuning changes how a model behaves,…