The thematic scope of the conference includes, among others: • Optimization in Machine Learning • Applications of Fractional Calculus in Optimization Problems These areas reflect the dynamic development of modern optimization methods and their influence on applied mathematics, data science, and engineering. The proceedings of GPCO 2026 will be published in one of the following forms: • a monograph • a special issue of Optimization: A Journal of Mathematical Programming and Operations Research • a special issue of the International Journal of Applied Mathematics and Computer Science (AMCS)