#reward hacking

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A sealed task cartridge caught mid-slide into a dock on a rotating carousel inside a bright vault of shelved cartridges, its foil seal intact and its latch not yet closed

How Benchmark Contamination Actually Works in Agentic Evaluation

A single-turn quiz question can be memorized whole. An agentic benchmark is an entire environment — a repository, a test suite, a live shell — and each of those can leak, get gamed, or get recognized as a test in ways a static question bank cannot.

By Brecht Corbeel · August 12, 2026 · 18 min read

A sheepdog trial course on a bright upland field with hazel hurdle gates at measured intervals, a small group of sheep caught between two gates and one animal drifting wide of the gate mouth

Agent Evaluation

Evaluating Trajectories, Not Answers

Measuring an agent is not measuring a model with extra steps. The object under test is a route through an environment, and a single success indicator reads only its last term.

By Brecht Corbeel · August 8, 2026 · 18 min read

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