OpenAI has released a comprehensive 36-page guide on building AI agents, detailing tools, prompts, and safe deployment strategies. This guide is aimed at developers looking to create full AI workflows, with NorthstarBrain highlighting 5 things to know about the guide. The company has also introduced new AI models, including o3 and o4-mini, designed for advanced reasoning tasks. The o3 model debuted at the fifth position in the WebDev Arena, showcasing a significant improvement over its predecessor, o3-mini, with a score increase of approximately 100 points. This ranking is based on approximately 150,000 community votes, with the current top three models being Claude 3.7 Sonnet, Gemini 2.5 Pro, and GPT-4.1. OpenAI's latest model, GPT-4o, has replaced the previous GPT-4 model in ChatGPT as of April 30, 2025. CEO Sam Altman bid farewell to GPT-4, acknowledging its impact on the field. The new model promises smarter, faster, and more nuanced AI interactions. In addition to model updates, OpenAI has announced new shopping features within ChatGPT, allowing users to search for products, compare options, and make purchases directly through the platform. This feature is available to all users, including those on the free tier.