Elon Musk has been in an ongoing feud with OpenAI, which he cofounded in 2015.Grzegorz Wajda/SOPA/Getty ImagesOpenAI just secured $6.6 billion in its latest funding round.The company asked investors not to back its rivals like Elon Musk's xAI, per Reuters.Musk, who is in an ongoing feud with OpenAI, called the company "evil."Elon Musk is once again throwing shots at the artificial intelligence company he co-founded.OpenAI, which Musk co-founded with CEO Sam Altman and 9 other people in 2015, said on Wednesday that it completed a record funding round of $6.6 billion at a $157 billion valuation, making it the most valuable startup in the world.That funding round, which included big-name investors like Thrive Capital, Microsoft, and Nvidia, had a stipulation that Musk isn't so happy with: Don't support OpenAI's rivals.According to anonymous sources speaking with Reuters, OpenAI asked investors for an exclusive funding agreement, in which they would refrain from backing five of its competitors.The list, according to the report, was Perplexity, Glean, Anthropic, Ilya Sutskever's Safe Superintelligence, and Musk's xAI, which developed Grok.The Financial Times also reported that OpenAI sought exclusivity.On Wednesday, Musk responded to posts on X criticizing OpenAI's request.