> ChatGPT_

On November 30, 2022, OpenAI quietly released a free research preview of a chatbot called ChatGPT. There was no major press event, no splashy marketing campaign. The product was based on GPT-3.5, a model fine-tuned using a technique called Reinforcement Learning from Human Feedback (RLHF), where human trainers ranked model outputs by quality and a reward model was trained on those rankings to guide the model toward more helpful, harmless, and coherent responses. Within five days, ChatGPT had one million users. Within two months, it had reached 100 million monthly active users, making it the fastest-growing consumer application in history, a record that still stands.

The world was not prepared. Teachers discovered students submitting AI-generated essays. Programmers found that ChatGPT could write working code from natural language descriptions. Lawyers realized it could draft legal briefs. Journalists watched it produce passable news articles. Customer service departments began exploring whether they could replace human agents. The New York City public school system banned ChatGPT from school devices. Universities scrambled to rewrite academic integrity policies. Stack Overflow banned AI-generated answers. The disruption was so sudden and so pervasive that it felt less like a product launch and more like a change in the weather.

Microsoft, which had invested $1 billion in OpenAI in 2019, moved quickly to deepen the partnership, announcing a $10 billion investment in January 2023 that valued OpenAI at $29 billion. The investment gave Microsoft exclusive rights to commercialize OpenAI's technology, which it integrated into Bing, Office 365, Azure, and a new product called Microsoft Copilot. Google, caught flat-footed, declared a "code red" and rushed to release its own chatbot, Bard (later renamed Gemini). The competitive scramble that followed, with every major tech company racing to ship AI products, represented the largest reallocation of corporate resources since the mobile revolution.

ChatGPT's impact extended far beyond technology. It forced a global conversation about the future of work, education, and human creativity. Economists debated whether AI would eliminate jobs or create them. Philosophers asked whether a system that could pass the bar exam and write poetry had anything resembling understanding. Regulators in Europe, China, and the United States began drafting AI governance frameworks. The product that OpenAI had released as a modest research preview had, within weeks, become the defining technology of its era. November 30, 2022, will likely be remembered as one of those rare dates when the trajectory of civilization visibly shifted.