Kleo is a GPT designed to efficiently assist Upper-Secondary educators in Iceland. This AI tool leverages the Icelandic national curriculum to improve various aspects of the educational process including lesson planning, material development, and student engagement. It facilitates smoother pedagogical processes by providing teachers with intelligent assistance in their daily tasks. While the primary function of Kleo is based on the Icelandic national curriculum, it is also adaptable to the unique needs of educators, making it a versatile tool in the educational sphere. With Kleo, educators can enhance their pedagogical techniques by aligning them with the national curriculum standards while also stimulating the interest and participation of their students. Significantly, Kleo is built on ChatGPT, a powerful language model capable of understanding and responding to user inputs, which is a key requirement for facilitating easy interaction with the platform. Despite its robust framework, using Kleo requires an account with ChatGPT Plus, a premium version of ChatGPT. Overall, Kleo stands as a promising AI tool for revolutionizing educational practices in the context of Iceland's Upper-Secondary education system.