OpenAI has expanded access to its advanced reasoning model, o1, allowing select third-party developers to utilize the model through its API. This rollout includes updates to the Realtime API and the introduction of new versions of GPT-4o and GPT-4o mini. Additionally, OpenAI has made ChatGPT Search available for free to all users, enhancing its capabilities to provide conversational answers with linked sources. The new features aim to position ChatGPT as a competitive alternative to traditional search engines like Google. Furthermore, OpenAI has announced a free course titled 'Reasoning with o1' to help users effectively leverage the new model for various tasks, including coding and planning. The o1 model is touted as being significantly more powerful than its predecessor, GPT-4, and is designed to improve reasoning accuracy and speed. The company is also integrating ChatGPT with a broader range of applications, including coding and note-taking tools, thereby enhancing its functionality in desktop environments.