RiddleBench: A New Generative Reasoning Benchmark for LLMs

AbstractWhile Large Language Models (LLMs) show remarkable capabilities, their complex reasoning skills require deeper investigation. We introduce **RiddleBench**, a new benchmark of 1,737 challenging puzzles designed to test reasoning beyond simple pattern matching. Our evaluation of state-of-the-art models reveals significant limitations, including hallucination cascades (uncritically accepting flawed peer reasoning) and poor self-correction due to strong self-confirmation bias. We also find that model performance is fragile, degrading when faced with reordered constraints or irrelevant information. RiddleBench serves as a resource for diagnosing these issues and guiding the development of more robust LLMs.