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LangChain community showcases multi-model pipeline token cost attribution solution

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AIMPACT message: On April 26 (UTC+8), in a community highlight published by LangChain’s official account on April 26, 2026, they introduced a practice shown by Simon Budziak: using LangChain’s UsageMetadataCallbackHandler and get_usage_metadata_callback(), together with LangGraph to enable per-node tracking in multi-model pipelines for cost attribution. A complete guide has been provided via a link. (Source: InFoQ)
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