OpenAI’s new flagship GPT model is made for AI agents

Remember when AI models could only tell you what to do? Now, the latest LLMs can actually do things with the help of agentic AI software, and OpenAI’s new flagship model is the newest of the bunch.

GPT-5.4 is out now on ChatGPT (where it goes by the name GPT-5.4 Thinking) as well as on the OpenAI API and OpenAI’s coding tool Codex (a version of which just came out for Windows).

This new GPT arrives with a number of new and revamped tricks, starting with its improved spreadsheet skills...