GPT-5.4 Thinking

GPT-5.4 Thinking is an extension of the earlier GPT-5 models, oriented toward more complex professional work. The key changes relative to previous versions include improved handling of agentic workflows, noticeably enhanced computer use and tool search, more reliable context retention during long reasoning chains, and greater token efficiency compared to GPT-5.2. OpenAI also highlights improvements in deep web research, particularly for highly specific queries. In ChatGPT, the Thinking variant adds the ability to display a reasoning plan upfront, allowing the user to redirect the response before it is completed.