Microsoft is preparing to host OpenAI's upcoming AI models, GPT-4.5 and GPT-5, as part of its ongoing collaboration with the AI research lab. GPT-4.5, codenamed Orion, is expected to launch as early as next week and will be OpenAI's last non-chain-of-thought model. It promises improvements over GPT-4 but lacks advanced reasoning capabilities. GPT-5, slated for release in late May 2025, will integrate OpenAI's o3 reasoning model, marking a significant leap in AI capabilities. This model aims to unify OpenAI's technologies into a seamless system, potentially advancing toward artificial general intelligence (AGI). Microsoft is expanding its server capacity to accommodate these models and is expected to showcase its integration of GPT-5 at its Build developer conference on May 19, coinciding with Google I/O. OpenAI plans to provide free access to these models for users, while also addressing user feedback by removing the need for manual model selection. The competition between Microsoft, OpenAI, and Google is intensifying as these tech giants race to lead in AI innovation.