Elon Musk is suing Sam Altman, Greg Brockman, and OpenAI, reportedly over the definition of Artificial General Intelligence (AGI) and its implications on licensing agreements with Microsoft. The lawsuit is related to Microsoft's exclusive licensing of OpenAI's GPT-3 language model and its claims to GPT-4, which it asserts has not reached the level of AGI. The definition of AGI and its potential attainment by GPT-4 are central to the dispute. The lawsuit's details are not publicly available, but the issue has sparked a discussion on the definition and implications of AGI.