1. ChatGPT, developed by OpenAI, is an AI-powered chatbot that generates text after a user enters a prompt using LLM technology. It's available for public use and can be integrated into various applications like programming scripts, emails, and more.
2. The most recent model used by ChatGPT is GPT-4o, with both free and paid versions available (ChatGPT Plus). The service updates its models regularly.
3. There have been concerns about the accuracy of information generated by ChatGPT, as well as potential legal issues such as defamation due to false statements. OpenAI allows users in certain jurisdictions to object to the processing of their personal information.