OpenAI has released GPT-5.4, once again its most powerful reasoning model. The new model combines advanced capabilities in reasoning, programming, and professional workflows in a single system. GPT-5.4 is now available in ChatGPT, the API, and Codex, and is aimed particularly at professional users who need to tackle complex tasks. Direct comparisons to top models from Anthropic, Google, or xAI are not yet available, neither on Arena.ai nor on Artificial Analysis. The focus on coding and work-