{
  "schema_version": "1.0",
  "surface_type": "guide_answer",
  "guide_id": "what-is-reranking",
  "question": "How do I estimate reranking cost impact in retrieval-heavy agent workflows?",
  "canonical_url": "https://www.unitcostai.com/guides/what-is-reranking",
  "related_tool_url": "https://www.unitcostai.com/tools/ai-workflow-cost",
  "formula": "reranking_cost = rerank_docs_per_request * rerank_cost_per_doc * requests",
  "assumptions": [
    "Rerank docs per request is measured from real query traces",
    "Reranking is separate from retrieval and generation costs",
    "Quality gain is evaluated before increasing rerank document count"
  ],
  "example": "20 docs per request at 0.00002 per doc for 100000 requests gives 40 reranking cost."
}