Tuning the harness, not the model: a Nemotron 3 Ultra playbook
3.78T1.5 sourceLangChain Blog
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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.
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The summary and note below are generated by the signal pipeline — they are Beyond Desk’s reading, not quotations from the source.
SummaryLangChain 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.
Why it mattersFirsthand playbook showing that adjusting scaffolding alone can close the gap with a frontier model, with a specific cost ratio attached.
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