#trajectory scoring

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A row of rack-mounted server blades running isolated agent sandboxes, one blade's activity light still lit and its drive tray partly drawn while the blades either side sit dark and fully seated

The Hardest Unsolved Problems in AI Agent Evaluation and Reliability

A benchmark score describes a trajectory that has already ended. The hardest problems in agent evaluation are about the ones still running, the ones nobody re-ran, and the ones no aggregate number shows.

By Brecht Corbeel · August 26, 2026 · 15 min read

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