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Despite showing initial promise, GPT-5 encountered difficulties when challenged to a digit-based Zendo game, revealing potential limitations in its logical reasoning capabilities. A user tested the AI’s ability to discern patterns and deduce a secret rule through examples and counter-examples. While GPT-5 proposed generating a Python script to aid in the process, its output wasn’t flawless. The user observed instances where the AI struggled with accuracy, even in simple observations. After multiple rounds, GPT-5 successfully identified the hidden rule, but not without making a notable mistake along the way. This experiment emphasizes the importance of rigorously evaluating large language models (LLMs) in tasks requiring precise logical deduction. The discussion originated on Reddit.