The long-standing rivalry between Elon Musk and Sam Altman escalated on social media this weekend, as the two billionaires traded personal insults and criticisms following a lawsuit filed by Apple against OpenAI. The public feud, which unfolded on the X platform, comes as both Musk’s xAI and Altman’s OpenAI move to solidify their positions in the artificial intelligence market. The tensions were punctuated by the release of new generative AI models from both camps: SpaceX’s Grok 4.5 and OpenAI’s GPT-5.6 Sol.
A History of Conflict
Musk and Altman share a history that began in 2015 when they co-founded OpenAI as a nonprofit research laboratory alongside a team of scientists and engineers. Musk exited the organization’s board in 2018 after donating tens of millions of dollars to the venture. In the years since, their relationship has soured. Musk filed a lawsuit in California accusing Altman of breaching the company’s original nonprofit mission by building an “opaque web of for-profit OpenAI affiliates.” While a jury ruled in favor of Altman earlier this year, Musk has vowed to appeal the decision. The discord flared again this week following news that Apple had initiated legal action against OpenAI, alleging the theft of trade secrets.
Personal Attacks and Social Media Exchanges
On Saturday, Musk reacted to the news of Apple’s lawsuit by labeling the OpenAI CEO “Scam Altman,” a moniker he has used repeatedly over the past year. In a series of posts on X, Musk continued his critique, writing, “He takes scamming to a whole new level,” and sharing a photo of Altman captioned, “I’m doing this because I love it,” to which Musk added, “By ‘this’ he means scamming.” Altman responded to the barrage of posts by questioning Musk’s own business ventures, specifically the development of space-based data centers. “[H]omeboy you’re the one sellling public market investors on short-term space datacenters,” Altman wrote. Musk replied to that comment, stating, “We start flying them next year. Maybe you can come see them if your parole officer approves.” Altman later framed the attention from Musk as a byproduct of their competitive landscape. “[T]here are a lot of benchmarks that suggest 5.6 sol is the best model in the world right now, but the most reliable way to tell is that elon is obsessed with me again,” Altman wrote.
Technological Competition: GPT-5.6 vs. Grok 4.5
The social media sparring coincides with a busy week for both companies. OpenAI and SpaceXAI—the division of Musk’s company focusing on enterprise AI applications—both launched new flagship models. According to industry assessments, the models serve different primary functions: | Feature | OpenAI GPT-5.6 Sol | SpaceXAI Grok 4.5 | | :— | :— | :— | | Primary Strength | Broad reasoning, business, cybersecurity | Autonomous coding, developer workflows | | Key Attribute | Outperforms on abstract reasoning | Highly efficient and lower cost to use | Both models are designed as “agentic” systems, capable of handling multi-step tasks autonomously.
Stakes for the Billionaire Leaders
The public conflict occurs against the backdrop of massive wealth and high-stakes business maneuvers. Musk, whose net worth is estimated at $917.3 billion, recently saw his company SpaceX complete a landmark initial public offering that raised $75 billion. OpenAI has also reportedly filed confidentially for its own IPO. As the two executives continue to trade barbs, the broader industry remains focused on the performance and implications of their latest technological releases.
Find more reporting in our Technology section.
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