ChatGPT

ChatGPT is a conversational AI product developed by OpenAI that allows users to interact with large language models through a natural chat interface. Launched in November 2022, it reached 100 million users within two months, making it one of the fastest-growing consumer applications in history and bringing AI capabilities to mainstream public attention.

The product has evolved significantly since launch. It now supports text, image, audio, and video inputs, can browse the web, execute code, generate images, and use external tools through plugins and integrations. ChatGPT is available as a free tier (using GPT-4o mini), a Plus subscription ($20/month with access to GPT-4o and reasoning models), and Team and Enterprise tiers for organizations. The product runs on OpenAI's successive model generations, from GPT-3.5 at launch through GPT-4, GPT-4o, and GPT-5.

ChatGPT's impact extends beyond its direct user base. It established the conversational interface as the default paradigm for interacting with AI, influenced how every major tech company positioned its AI products, and created an ecosystem of plugins and integrations. Apple integrated ChatGPT into Siri and system-level features on iOS before its subsequent partnership with Google's Gemini, and the product continues to compete directly with Claude, Gemini, and other conversational AI systems for consumer and enterprise users.