Humanity's Last Exam (HLE) is a comprehensive benchmark test designed to evaluate advanced AI systems on complex reasoning, knowledge, and analytical tasks. Created by leading AI researchers, the exam covers diverse domains including mathematics, science, law, medicine, and humanities. OpenAI's GPT series has demonstrated strong performance on many standardized tests, but HLE represents an elevated challenge with stricter evaluation criteria. The market closes on June 30, 2026, providing a clear resolution date based on the actual test results when published by the creators. The market is resolvable because HLE maintains transparent scoring methodologies and publicly releases results. With current odds at 54% YES, traders are pricing in a slightly better-than-even chance that GPT will surpass the 50% threshold, reflecting cautious optimism about the model's advanced reasoning capabilities balanced against the exam's rigorous standards. The prediction reflects both confidence in OpenAI's continuous model improvements and uncertainty around the specific benchmark difficulty level. Early price action suggests mixed sentiment, with recent volume indicating active debate among traders about whether GPT's current generation will definitively cross this performance milestone on what is considered one of the most demanding AI evaluation frameworks available.