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Long-Context Techniques

Structural tactics against 'lost in the middle' in 1M-token contexts.

3 hours2 resources1 prereqs

Tactics:

  1. Instructions at start AND end (critical rules in two places)
  2. XML / markdown sectioning — wrap each doc in a tag
  3. Short summary on top, detail below
  4. Narrow with "look only at sources: <ids>"
  5. End-anchored sampling — put the most critical info in the final user message

Test: Needle-in-a-haystack benchmark — can the model find a random fact in the context when asked?

Prerequisites

Context Window
The total tokens the model can hold in one turn. Must-know.
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Resources(2)

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Long-Context Techniques · Prompt Engineer Roadmap | Şükrü Yusuf Kaya