GPT-5.4 is coming soon: double the context window of GPT-5.2, more reliable performance on long-running tasks, and a new "extreme" thinking mode.

GPT-5.4 is coming soon: double the context window of GPT-5.2, more reliable performance on long-running tasks, and a new "extreme" thinking mode.

GPT-5.4 is OpenAI's most capable model yet, combining coding, computer operation, and reasoning in a single package for the first time.