OpenAI just dropped GPT-5.4, and it’s a massive upgrade for anyone doing serious work with AI. This new model is the first to combine top-tier reasoning, coding from GPT-5.3-Codex, and native computer-use abilities—all in one package. In ChatGPT, GPT-5.4 Thinking can now show you its plan mid-response, letting you steer it in real-time for way better results. For developers, it’s a game-changer: the model can operate computers directly, handle up to 1 million tokens of context, and use tools more efficiently with a new tool search feature. The biggest win? It’s significantly more token-efficient than GPT-5.2, meaning faster speeds and lower costs. On professional benchmarks, it matches or beats human experts in 83% of cases. Why it matters: GPT-5.4 closes the gap between AI being a helpful assistant and a true autonomous agent, making complex, multi-step professional work finally practical and cost-effective.