CEO Sam Altman said using the chatbot will be like talking with a doctorate-level expert in any topic.

The A.I. start-up said its new flagship technology was faster, more accurate and less likely to make stuff up.

Here’s a rundown of all of the changes you can expect to see in ChatGPT.

OpenAI on Thursday launched GPT-5, an upgraded version of the AI model behind ChatGPT that the company claims is significantly faster and more capable than its predecessor. The launch comes as the AI ...