Source record

Published by LangChain Blog (T1.5 source). The original is at https://www.langchain.com/blog/tuning-the-harness-not-the-model-a-nemotron-3-ultra-playbook.

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 tuned the harness (system prompts, tool descriptions, middleware) around NVIDIA's Nemotron 3 Ultra open model, achieving agent performance comparable to Opus 4.8 at roughly 8x lower cost, without modifying the model itself.

Firsthand playbook showing that adjusting scaffolding alone can close the gap with a frontier model, with a specific cost ratio attached.

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