GoKawiilElon Musk arrives at federal court in Oakland, Calif., on April 30, 2026. Elon Musk invested in OpenAI early on believing it would be a non-profit, but is now suing OpenAI and its CEO Sam Altman for allegedly deceiving him by developing OpenAI into a for-profit company.
Elon Musk and Sam Altman criticized each other in new posts on X, highlighting the billionaires' long-standing tussle over OpenAI's evolution.
Musk and Altman helped to start OpenAI in 2015 as a nonprofit artificial intelligence research lab alongside a band of engineers and scientists.
In 2018, Musk left OpenAI's board after donating tens of millions to the organization, although he later objected to Altman's efforts to construct "an opaque web of for-profit OpenAI affiliates" in a lawsuit that went to trial in California this year. A jury ruled in favor of Altman, and Musk said he would appeal the case.
Weeks later, Musk's company SpaceX — which controls the X social platform, the xAI lab that challenges OpenAI and the Starlink broadband internet service — completed its landmark initial public offering. SpaceX raised a record $75 billion as it promoted plans to launch data centers into space, in addition to ambitions in enterprise AI applications and interplanetary transportation. Meanwhile, OpenAI has filed confidentially for its own IPO.
This week, SpaceX released the Grok 4.5 generative AI model, while OpenAI debuted its own GPT-5.6 Sol. For days, Musk and Altman have hyped up their respective releases, but on Saturday the rivalry got personal.
In response to a post about Apple filing suit against OpenAI on Friday over alleged theft of trade secrets, Musk wrote, "Scam Altman strikes again …"
The Tesla and SpaceX CEO has used the "Scam Altman" moniker to refer to the OpenAI CEO on several occasions over the past year. Minutes after his post, Musk doubled down, writing, "He takes scamming to a whole new level."
Next, Musk published a photo of Altman that included the words, "I'm doing this because I love it."
"By 'this' he means scamming," Musk wrote, including two rolling-on-the-floor-laughing emojis.
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