Rationale is an AI tool powered by Generative Pre-training Transformer (GPT) and in-context learning. It's primary function is to aid in decision-making by providing well-balanced analytical insights. Rationale's capabilities are enhanced by leveraging the power of GPT4 and in-context learning, to facilitate nuanced understanding of complex situations and scenarios. The tool is designed to present multiple perspectives or 'two sides of the coin' to provide a comprehensive view of the decision scenario. Rationale's features include the analysis of pros & cons, cost-benefit studies, Strengths, Weaknesses, Opportunities, and Threats (SWOT) analysis, multi-option assessment, and predicting potential outcomes. These features help users and businesses make well-informed and rounded decisions, thereby decreasing the chances of bias and errors in the decision-making process. Rationale, through its focus on in-context learning, adapts and improves its decision support capabilities as it is exposed to more scenarios, making it a progressive AI tool for enhanced decision-making.