GPT-5.4 Pro is OpenAI's most advanced variant of the GPT-5.4 family, optimized for maximum performance on complex, high-stakes professional tasks. It builds on GPT-5.4's unified architecture with enhanced multi-path reasoning evaluation and greater analytical depth, making it ideal for scientific research, legal analysis, financial modeling, and complex decision-making. The model features a 1 million+ token context window, native computer-use capabilities, and state-of-the-art agentic tool use. It is available to Pro and Enterprise ChatGPT plan users and via the OpenAI API.