Microsoft Copilot is a generative artificial intelligence chatbot developed by Microsoft. Based on the GPT-4 series of large language models, it was launched in 2023 as Microsoft's primary replacement for the discontinued Cortana. From Wikipedia
The new Copilot Agent, available in preview for Pro+ and Enterprise users, automates bug fixes, feature additions, and more, leveraging Anthropic’s Claude 3.7 Sonnet model with developer oversight.