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You want to track cost separately for two different runs in LangChain. Which approach correctly achieves this?

hard📝 Application Q8 of 15
LangChain - LangSmith Observability
You want to track cost separately for two different runs in LangChain. Which approach correctly achieves this?
AUse two separate <code>with get_openai_callback() as cb:</code> blocks, one per run
BRun both chains inside one callback context and reset cb.total_cost manually
CCall <code>get_openai_callback()</code> once and run both chains without context
DUse a global variable to store cost and update it after each run
Step-by-Step Solution
Solution:

  1. Step 1: Understand callback context isolation

    Each with get_openai_callback() as cb: block creates a fresh callback tracking instance.

  2. Step 2: Explain why separate contexts are needed

    To track costs separately, use separate contexts so costs don't accumulate together.

  3. Final Answer:

    Use two separate with get_openai_callback() as cb: blocks, one per run -> Option A

  4. Quick Check:

    Separate contexts track costs separately = D [OK]
Quick Trick: Use separate 'with' blocks for separate cost tracking [OK]
Common Mistakes:
MISTAKES
  • Trying to reset total_cost manually inside one context
  • Running chains without callback context
  • Using global variables instead of callback

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