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Lesson 4 · 10 min

Planning — single-step vs multi-step

ReAct is reactive. For long tasks you also want a plan. The hybrid wins.

Two extremes

  • Pure ReAct (reactive): decide each step on the fly. Cheap to start, drifts on long tasks because the model loses sight of the goal.
  • Plan-then-act: produce a full plan first, then execute it step by step. Better on multi-step, but the plan can be wrong and the model rarely re-plans cleanly when reality diverges.