METR · March 3, 2026

Playable agent demos need deeper inspection and explicit acceptance criteria

Why it matters

A METR researcher tested Opus 4.6 on simplified terminal reimplementations of two existing games. Initial playthroughs found recognizable gameplay alongside missing or broken mechanics, without a predefined scoring rubric. A July follow-up uncovered additional problems that the original inspection missed. The tasks benefited from documented rules and reduced scope, and more complete versions failed on initial attempts. This is a qualitative study of deliverable inspection, not a measure of general game-development productivity.

My takeaway: Define required behavior and excluded scope before evaluation. Test interactions and uncommon states beyond the happy path, then revisit apparently successful deliverables with a domain expert. Record reruns and specification changes, and avoid converting rough human effort estimates into measured productivity gains.
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