there is no information about Oprah Winfrey selling a Gustav Klimt painting for $150 million. It's possible that such an event occurred after i lost interest in that topic, in which case, I wouldn't have access to that specific information.
To find the most recent and accurate information on this topic, I recommend checking reliable news sources or conducting an online search for recent news articles related to Oprah Winfrey's art collection or potential art sales.