OpenAI dropped GPT‑5.4 this week, and the company said ChatGPT power users should notice improvements right away. The launch comes just days after the launch of GPT-5.3 Instant, a more conversational model geared toward everyday users. OpenAI wrote that GPT-5.4 is the "most capable and efficient frontier model for professional work." So, obviously, GPT-5.4 is designed for professionals and developers. The company also announced the launch of GPT-5.4 Thinking and GPT‑5.4 Pro, aimed at people who want peak performance. Here are three improvements that OpenAI made. ## Improved efficiency OpenAI said that GPT-5.4 operates more efficiently than ever. It wrote that it was the company's "most token-efficient reasoning model yet, using significantly fewer tokens to solve problems when compared to GPT‑5.2, translating to reduced token usage and faster speeds." Basically, that means GPT-5.4 can solve problems and deliver answers with fewer tokens.…