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The Harness Effect: Why Your AI Coding Agent's Wrapper Matters More Than Its Model

This story is from 2026-09-08. It is preserved in the archive; the latest stories are on the live feed.

What is the harness? Claude Opus scored 93% inside Cursor on Terminal-Bench 2.0. The same model scored 77% inside Claude Code — a 16-percentage-point swing on the same benchmark, with the same model weights, the same training data. The only variable was the harness: the layer between the model API…

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  1. 2026-09-08 05:40 · DEV Community — AI
    The Harness Effect: Why Your AI Coding Agent's Wrapper Matters More Than Its Model

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