Dec 16 (Reuters) - Amazon.com Inc is currently in discussions to invest in OpenAI, the developer behind ChatGPT, in a potential agreement that could push the artificial intelligence company's value beyond $500 billion, according to a person with knowledge of the situation. Amazon's potential contribution could reach around $10 billion, although talks remain in early stages and may change, the source noted, speaking anonymously due to the confidential nature of the discussions. This