Why AI Agent Reliability Depends More on the Harness Than the Model

Hacker NoonHacker Noon
• February 25, 2026 at 05:16 AM
Why AI Agent Reliability Depends More on the Harness Than the Model

The APEX-Agents benchmark tested frontier models on real professional tasks (banking, consulting, law) Models score above 90% on coding puzzles and multiple-choice tests, then fail at the kind of work an analyst does on a Tuesday morning.

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