What sets these new models apart from OpenAI's other models (like GPT-4o and GPT-4.5) is their simulated reasoning capability, which uses a simulated step-by-step "thinking" process to solve problems. Additionally, the new models dynamically determine when and how to deploy aids to solve multistep problems. For example, when asked about future energy usage in California, the models can autonomously search for utility data, write Python code to build forecasts, generate visualizing graphs, and explain key factors behind predictions—all within a single query.