GPT-5.4 Pro

GPT-5.4 Pro is the performance-oriented variant of OpenAI's GPT-5.4 line, released on March 5, 2026 alongside the base model in both ChatGPT and the API. OpenAI positions it specifically for users who want maximum performance on complex tasks, sitting above the standard GPT-5.4 release, which itself is described as the company's most capable and efficient frontier model for professional work. Together, the two tiers mark a consolidation of OpenAI's recent advances in reasoning, coding, and agentic workflows into a single product family, with Pro reserved for the most demanding workloads.

The GPT-5.4 family is engineered around unified professional use: it brings together stronger reasoning, the coding capabilities inherited from GPT-5.3-Codex, and more capable tool, software-environment, and document workflows spanning spreadsheets, presentations, and other office artifacts. GPT-5.4 Pro inherits that same professional focus, making it best suited to complex workflows that mix long-horizon reasoning with tool use, code generation, and structured document work, such as agentic automation, deep research, and advanced analysis pipelines, where the extra performance headroom over the base model is most likely to matter.