Harness
A Harness denotes the orchestration framework or engineering layer that wraps a large-language-model (LLM) to control execution flow, manage context, and integrate external tools. Performance differentiation is now dominated by harness design rather than base model selection.
Core Insights
- Orchestration Priority: Stanford research indicates that LLM performance variance is primarily determined by orchestration code quality, superseding architectural improvements. Orchestration Over Architecture: Harness Engineering for Optimal LLM Performance
- Engineering Shift: Development focus moves from weight training to structural control, implementing robust prompt-engineering, retrieval augmentation, and decision trees.
- Optimization Vector: Harnesses enable fine-grained control over latency, cost, and reliability, decoupling application logic from model non-determinism.