This episode explores the release of GPT 4.1, GPT 4.1 Mini, and GPT 4.1 Nano, focusing on improvements designed to enhance developer experience. Against the backdrop of previous model releases (like GPT 4.0 and GPT 4.5), the hosts and guests discuss the rationale behind the version numbering and the models' architectural underpinnings. More significantly, the conversation delves into the advancements in instruction following, coding capabilities, and the introduction of 1 million context models. For instance, the discussion highlights the challenges and innovations in achieving long context capabilities, illustrated by the development of new evaluation benchmarks like GraphWalks. As the discussion pivots to practical applications, the panel explores the interplay between different model types (reasoning vs. non-reasoning) and their suitability for various tasks, such as agentic workflows and code generation. Finally, the episode concludes with insights into fine-tuning options, pricing strategies, and the future direction of OpenAI's model development, emphasizing the importance of developer feedback and data sharing for continuous improvement.