GPT-5.4, OpenAI’s most recent frontier AI model, is now available via the API and Codex, as well as in ChatGPT as GPT-5.4 Thinking. The update focuses on stronger reasoning, coding, and agentic workflows aimed at professional productivity.
The coding functions of GPT-5.3-Codex combine with the software tool, document, spreadsheet, and presentation performance enhancements of GPT-5.4. The Thinking mode of ChatGPT enables users to see the logical path that leads to their final answer and allows them to modify their instructions during the answer process.
The system provides built-in computer operation functions that enable AI systems to handle software applications, perform operational tasks, and browse the internet. The system enables handling of 1 million tokens while delivering better token processing efficiency than GPT-5.2.
The Thinking system of GPT-5.4 replaces the Thinking system of GPT-5.2 in Plus users, Team users, and Pro users while GPT-5.4 Pro serves enterprise customers who need to run their most demanding tasks.