The World’s Toughest AI Exam Tests Reasoning, Not AGI Yet

A new benchmark called Humanity’s Last Exam aims to measure how close today’s AI models come to human-level knowledge by presenting 2,500 carefully vetted, PhD-level questions across 100+ subjects. Launched in 2025, it has been attempted by top models like GPT-4o, Google Gemini The top score reported so far is 48.4% (Gemini 3 Deep Think), far below typical human expert performance (~90%). The test prioritizes precise, non-searchable knowledge and verifiable answers, filtering out questions AI could answer via web search. While a high score would indicate expert-level capability in specific domains, researchers say it does not by itself signal AGI or autonomous, general intelligence.