Lean Manufacturing is the key to operational excellence and sustainable competitive advantage. Lean Manufacturing maturity is considered as a significant factor for companies who seek to achieve high organizational outcomes and effectiveness. In this paper, the emphasis is placed on the effect of Generative Artificial Intelligence (GenAI) in improving the comprehensiveness and implementation of Lean Management within manufacturing companies. Through the incorporation of GenAI, organizations can achieve greater levels of operational Lean maturity faster. Exploring the relationship between Generative AI and Lean Manufacturing maturity could offer benefits in terms of discovering the future of technology and its implementation into continuous improvement enhancement and Sustainable lean initiatives.