Buffett's Investment Companion is a Generative Pre-trained Transformer (GPT) application designed to offer insights based on Warren Buffett and Charlie Munger's perspectives as captured in the Berkshire Hathaway Letters from 1958 to 2022. The tool, created by Rodolfo Saccoman, aims to educate and guide users in understanding and applying the investment strategies and philosophies of these renowned investors. The application requires a subscription to ChatGPT Plus and provides prompt-based interactions to assist users in their journey to financial wisdom. For instance, the prompts could be seeking Buffett's views on diversification, seeking an analysis of a tech stock's annual report, explanations on value investing, or even discussing advice and tips for leading a fulfilling life. Additionally, it provides learning opportunities for users interested in understanding market-beating investment strategies. While it won't replace the need for personal financial advisors and shouldn't be expected to make investment decisions on its own, the GPT can serve as an educational resource for those interested in following and learning from the investment strategies of Buffett and Munger.