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arXiv — cs.AI preprintsInternational9 October 2026

AgentHorizon: Evaluating Agentic Judges for Long-Horizon Computer-Use Tasks

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arXiv:2610.11050v1 Announce Type: new Abstract: Computer-use agents are capable of completing complex tasks, increasing the use of automatic judges to determine success, either for training or for evaluation without human involvement. Despite their flexibility, their reliability on long tasks spanning multiple applications remains unclear. A trajectory, composed of long sequences of screenshots and actions, may appear complete, but in reality violates constraints from the instruction or introduces an unwanted side effect. To identify these errors, a judge needs to examine the trajectory with r
— arXiv — cs.AI preprints

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