By Deepa Seetharaman and Jonathan Stempel April 27 (Reuters) - The bitter legal fight between Elon Musk and the leading artificial intelligence firm, OpenAI, led by Sam Altman, may come down to a few pages in one executive's personal diary.

Musk, who co-founded the company that created ChatGPT with Altman, wants more than $130 billion in damages in a lawsuit that could shakeup the artificial intelligence landscape.

Mr Musk is seeking $US150 billion ($208 billion) in damages from OpenAI and Microsoft, one of its largest investors, according to a person involved in the case, with proceeds going to OpenAI's charita...