// Hacker Noon · 25 February 2026

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.

Hacker Noon

@hacker-noon · Evangelos Pappas

hackernoon.com

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