ChatGPT
OpenAI's conversational AI product that brought large language models to mainstream awareness, powered by GPT-3.5 and later GPT-4.
Impact
Launched November 2022, ChatGPT reached 100 million users in 2 months -- the fastest-growing consumer application in history. It demonstrated that LLMs could be useful assistants, sparking massive investment in AI.
Architecture
ChatGPT combines a pre-trained GPT model with instruction tuning and RLHF alignment to produce a helpful, harmless conversational agent. The product includes web browsing, code execution, image generation, and plugin capabilities.