OpenAI made significant advancements in 2025, introducing a range of new models, APIs, and tools like Codex, which have enhanced the capabilities for developers. Key developments include the convergence of reasoning models from o1 to o3/o4-mini and GPT-5.2, the introduction of Codex as a coding interface, and the realization of true multimodality with audio, images, video, and PDFs. Additionally, OpenAI launched agent-native building blocks such as the Responses API and Agents SDK, and made strides in open weight models with gpt-oss and gpt-oss-safeguard. The capabilities curve saw remarkable improvements, with GPQA accuracy jumping from 56.1% to 92.4% and AIME reaching 100% accuracy, reflecting rapid progress in AI's ability to perform complex tasks. This matters because these advancements empower developers with more powerful tools and models, enabling them to build more sophisticated and versatile applications.
