Source record

Published by LangChain Blog (T1.5 source). The original is at https://www.langchain.com/blog/how-to-build-a-model-router-in-the-harness.

Pipeline notes

The summary and note below are generated by the signal pipeline — they are Beyond Desk’s reading, not quotations from the source.

LangChain details a model router built into their Open SWE coding agent harness that reduced median cost per coding task by 64% with no measurable quality drop, by routing each task to the appropriate model tier instead of always defaulting to a frontier model.

Firsthand production write-up with concrete cost metrics and a reusable pattern for scaling coding agents economically.

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