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Two glowing data streams converging, retrieval versus long-context on a dark studio surface

Engineering · Jul 19, 2026 · 12 min read

2M-token context vs RAG in 2026: cost, latency and when each actually wins

Gemini 3.5 Pro's 2M-token context reopened the long-context vs RAG debate. Here is the real cost math, the accuracy that breaks mid-window, and a decision framework for backend and ML engineers in 2026.

Manu Shukla

#RAG #long-context #LLM