GPT-5.4 Thinking in ChatGPT

GPT-5.4 brings together the best of recent advances in reasoning, coding, and agentic workflows into a single frontier model. It incorporates industry-leading coding capabilities while improving how the model works across tools, software environments, and professional tasks involving spreadsheets, presentations, and documents.

In ChatGPT, GPT-5.4 Thinking can now provide an upfront plan of its thinking, so you can adjust course mid-response while it's working and arrive at a final output that's more closely aligned with what you need without additional turns. GPT-5.4 Thinking improves deep web research, particularly for highly specific queries, while better maintaining context for questions that require longer thinking. It also has improved context window management that supports its ability to think for longer.