OpenAI has released GPT-5, described as the "best model in the world" and their first unified AI system. It offers expert-level intelligence across multiple fields with improved reasoning capabilities, faster response times, and reduced hallucinations. New features include customizable personalities, enhanced voice capabilities, Study Mode for learning, and integration with Gmail and Google Calendar. GPT-5 comes in standard, mini, and nano versions, with free access for all users and higher usage limits for paid subscribers. The model represents a significant advancement toward OpenAI's goal of developing artificial general intelligence (AGI) and is being rolled out to ChatGPT Team users immediately, with Enterprise and Edu users gaining access on August 14.