ChatGPT is OpenAI's flagship AI assistant, offering conversational AI, code generation, image generation (via DALL-E), web browsing, and document analysis. As of mid-2026, it runs models from the GPT-5.5 series and offers six subscription tiers from free to enterprise. It is used by hundreds of millions of people for writing, research, coding, and productivity tasks, and includes a GPT Store for custom agents. Key features: - GPT-5.5 series models with multimodal input (text, images, files, voice) - Web search and real-time information retrieval - DALL-E image generation built in - Code interpreter and file analysis - Custom GPTs via the GPT Store - Deep Research mode for long-horizon research tasks (Plus and above)
Free ($0); Go ($8/month); Plus ($20/month); Pro ($100 or $200/month); Business ($25-$30/user/month); Enterprise (custom).