OpenAI launches GPT 5.4 in ChatGPT; claimed to support up to 1M tokens of context

OpenAI has launched GPT-5.4, a new version of its artificial intelligence model, in ChatGPT. The company says the model is its “most capable and efficient frontier model for professional work”. The new AI model is available in ChatGPT as GPT-5.4 Thinking, and it is also being released through its developer API and the coding platform Codex. The update combines improvements in reasoning, coding and task automation into a single system. OpenAI said the new model is designed to help users complete tasks involving documents, spreadsheets, presentations and software tools. A second version called GPT-5.4 Pro is also being released for users who need higher performance on complex tasks.