Rapid changes and increasing technological complexity have led organizations to use innovative strategies to maintain competitiveness and growth. One of these effective strategies is open innovation, which allows organizations to benefit from external knowledge, ideas, and technologies in addition to internal resources. By adopting open innovation, companies can increase their innovation capacity and strengthen their value creation and adaptability. This study aims to provide a comprehensive model to assess the readiness of companies to establish corporate accelerators and implement open innovation in them. Corporate accelerators, as a platform for cooperation between companies and startups, provide opportunities for knowledge exchange, technology development, and co-creation. The model proposed in this study facilitates the effective flow of external knowledge and technology into organizations and helps companies to benefit from innovative capacities in a sustainable manner. In this study, a comprehensive literature review on the subject of open innovation and corporate accelerators was first conducted, and an interview protocol was developed based on that. Then, in the qualitative phase, data were collected through semi-structured interviews with experts and coded using thematic analysis. Finally, the proposed model was developed by integrating the findings of the literature and the analysis of the interviews. The results of the study show that the proposed model increases the innovation capacity in organizations and accelerates internal innovation processes by providing the necessary tools and mechanisms for collaboration between companies and startups. As a practical framework, this model provides guidance for managers and policymakers in developing sustainable innovation.