Before launching, GPT-4o broke records on chatbot leaderboard under a secret name

Enlarge (credit: Getty Images)

On Monday, OpenAI employee William Fedus confirmed on X that a mysterious chat-topping AI chatbot known as "gpt-chatbot" that had been undergoing testing on LMSYS's Chatbot Arena and frustrating experts was, in fact, OpenAI's newly announced GPT-4o AI model. He also revealed that GPT-4o had topped the Chatbot Arena leaderboard, achieving the highest documented score ever.

"GPT-4o is our new state-of-the-art frontier model. We’ve been testing...