ChatGPT is OpenAI's flagship AI chatbot and the most widely used AI assistant in the world. Powered by the GPT-5.2 model family, it offers conversational AI capabilities spanning text generation, code writing, data analysis, image generation, document understanding, and real-time web browsing. ChatGPT supports multimodal input including text, images, files, and voice, with advanced features like extended thinking for complex reasoning tasks. The platform includes Codex, an integrated coding agent for software development tasks, and Prism, an AI-native research workspace for deep analysis. Memory functionality allows ChatGPT to remember user preferences and context across sessions for personalized interactions. ChatGPT is available across web, iOS, Android, macOS, and Windows, with six subscription tiers ranging from a free plan to the $200/month Pro plan. Business and Enterprise plans offer team collaboration, centralized billing, SSO, and advanced security features for organizational deployment.