This article proposes and demonstrates the Evolutionary Model of Symbiotic Relationships for Innovation, which aims to evaluate the propensity to establish mutualistic symbiotic relationships between corporations and startups, considering evidence of the complementarity of strategic assets for innovation of these organizations. Inspired by the concept of symbiosis, the goal is to identify the pairs with the greatest complementarity of strategic resources necessary for the generation and capture of the value of innovation projects and determine if this relationship promotes gains for both parties. Results show a correlation between the propensity indicated by the model and the selection actually performed.