OpenAI has added a new model called ChatGPT 5.4 Thinking to its ChatGPT platform. The model is designed for tasks that require more complex reasoning and multi‑step analysis, and it is offered as an optional mode for Plus, Team and Pro subscribers. While the existing ChatGPT 5.3 Instant remains the default for everyday conversations, 5.4 Thinking lets users see a brief plan of how the AI will tackle a request, enabling real‑time adjustments. The upgrade aims to make ChatGPT more useful for professional workflows such as document creation, spreadsheet analysis, and presentation design. Read more →