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API vs. RAG vs. Fine-Tuning vs. Custom AI: Which to choose?

This story is from 2026-09-15. It is preserved in the archive; the latest stories are on the live feed.

Building an AI-powered application does not always mean training your own model. Today, developers can build AI features by calling a foundation model through an API, connecting an LLM to private data with RAG, fine-tuning an existing model, or developing a custom AI model from the ground up. These…

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  1. 2026-09-15 08:03 · DEV Community — AI
    API vs. RAG vs. Fine-Tuning vs. Custom AI: Which to choose?

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