Harness Engineering: The Layer That Matters More Than the Model (opens in new tab)

Last Updated on May 27, 2026 by Editorial Team Author(s): Can Demir Originally published on Towards AI. Why the same model behaves like a different system depending on what surrounds it — and the anatomy of a good harness For the past two years, almost every conversation in AI has started with the same question: “Which model is best?” Opus or GPT or Gemini? Which one hallucinates less, which one writes cleaner React, which one holds the longest context? After the introduction, the article lay...