ChatGPT

Overview ChatGPT is OpenAI's flagship conversational AI assistant, launched in November 2022 and, four years later, still the product most people mean when they say "AI." It runs on the GPT 5 family of models as of 2026, with older GPT 4 tier models still available for lighter work, and it sits inside an ecosystem — custom GPTs, DALL E 3 image generation, Sora video, Advanced Voice, plugins, memory across chats — that no competing assistant has matched in breadth. Sam Altman's OpenAI built ChatGPT as a research demo of the underlying InstructGPT model and accidentally shipped the fastest growing consumer product in history. In the years since it has hardened into three real products stacked on one another: a free chatbot most of the world has tried, a $20/month Plus subscription that most paying users sit on, and a $200/month Pro tier plus a Team/Enterprise stack aimed at organizations. The API and Assistants platform live underneath, powering an enormous developer ecosystem. The one line positioning: ChatGPT is the assistant with the widest ecosystem and the deepest consumer mindshare — the pick when you want writing, images, voice, and light research in a single tab, and the pick when whoever you're working with already knows how to use it. It is not always the sharpest model on hard reasoning — Claude and Gemini both win specific benchmarks — but the total product surface is larger than either competitor's, and for most day to day work that surface matters more than…