March 24, 20267 min readLATEST
The Harness Problem: Why the Same Model Feels Like a Genius in One Tool and an Intern in Another
Claude on Cursor and Claude on Claude.ai are the same model — but they feel completely different. The gap isn't the AI. It's the harness. Here's what that means, with real Terminal-Bench numbers showing an 18-point swing from scaffolding alone.
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