GPT-5 is more than an upgrade. It aims to be a single, smarter system that blends reasoning, multimodality, cost efficiency, and usability into one.

OpenAI has launched Harmony, a mandatory new response format for its gpt-oss models, designed to structure agentic workflows with dedicated developer tools

If you’re wondering what all the hoopla is about, and what makes GPT-5 better than, or different from, the company’s previous AI models, here’s a quick rundown of some of the key new features and functionality.