Microsoft is making GPT-5.1 available in Microsoft Copilot Studio, alongside OpenAI’s release. It is available as an experimental model for U.S. customers in early release cycle Power Platform environments. The GPT-5.1 series brings improved adaptability in thinking time in both chat and reasoning. Experimental models give customers the opportunity to test cutting-edge capabilities before they reach general availability, and to evaluate performance against their use cases and existing models to prepare for deployment. As experimental models, Microsoft recommends using them in non-production scenarios while it completes its evaluation gates. This approach allows customers to stay ahead of the curve, experimenting with the latest AI models while Microsoft ensures they meet quality standards.