OpenAI announced its decision to cease providing AI models to Cursor, the coding tool company recently acquired by Elon Musk's SpaceX. This move stems from OpenAI's lack of confidence that SpaceX will adhere to its terms of service, citing past contract violations by Musk's companies. Specifically, OpenAI mentioned that X, formerly Twitter, breached its contract after Musk's acquisition. Michael Truell, a Cursor co-founder and now a SpaceX executive, indicated that discussions were underway to resolve the issue.Hours later, Anthropic, a rival AI firm with an existing partnership with SpaceX, committed to increasing compute support for Claude models in Cursor. OpenAI’s blog post emphasized the need for custom contracts with large partners like SpaceX to ensure safety and compliance. Elon Musk responded on X.com, stating he "couldn't care less" about OpenAI's decision. He further accused OpenAI CEO Sam Altman and President Greg Brockman of being "untrustworthy." Musk reiterated his claim that they "stole an open source nonprofit."