#pass@k

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A life-test rack of identical fixture channels running the same trial in parallel, most channels at rest with their indicator flags settled while one actuator arm is caught mid-stroke and its flag mid-flip

AI Agents & Systems

Measuring AI Agent Reliability: What the Evidence Actually Supports

A single successful run shows a system can succeed once. Pass@k, pass^k, and repeated-trial statistics are how anyone finds out whether it succeeds reliably — and task length changes the answer.

By Brecht Corbeel · August 12, 2026 · 17 min read

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