HalluWorld
Language models are evaluated on hallucinations across controlled reference worlds spanning gridworlds, chess, and realistic terminal environments. Each environment has a fully specified ground truth, allowing automatic evaluation of whether model claims are correct. Questions test perception, memory, causal reasoning, uncertainty/abstention, and compound reasoning under varying levels of observability, complexity, and conflicting information.
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We read the headline results of 523 launch posts from 52 labs, and none of them list this benchmark.
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