Copilot uses OpenAI's GPT-4, which means that since its launch, it has been more efficient and capable than the standard, free version of ChatGPT, which was powered by GPT 3.5 at the time. At the time, Copilot boasted several other features over ChatGPT, such as access to the internet, knowledge of current information, and footnotes.Also: I was a Copilot diehard until ChatGPT added these 5 featuresIn May 2024, however, OpenAI supercharged the free version of its chatbot with GPT-4o. The upgrade gave users GPT-4 level intelligence, the ability to get responses from the web, analyze data, chat about photos and documents, use GPTs, and access the GPT Store and Voice Mode. After the upgrade, ChatGPT reclaimed its crown as the best AI chatbot.