OpenAI has officially announced GPT-5.4, a new flagship model designed for professional work, and it is much more than a routine model refresh. Announced on March 5, 2026, GPT-5.4 is rolling out across ChatGPT, the API, and Codex, while GPT-5.4 Pro is being positioned as the higher-performance option for the toughest tasks. According to OpenAI, the goal with GPT-5.4 is to combine advanced reasoning, stronger coding, better tool use, native computer-use capabilities, and improved professional output quality into a single model.