Microsoft Copilot Studio

GPT-5.1 Lands in Copilot Studio as OpenAI Pushes Speed, Reasoning, Personalization Forward
Microsoft and OpenAI have released GPT-5.1 in Copilot Studio for US customers, offering two versions—Instant and Thinking—for enhanced reasoning and personalization, thereby supporting enterprise-scale adoption and allowing organizations to test advanced AI capabilities in a controlled environment.