Elon Musk and Sam Altman co-founded OpenAI with a shared goal: build powerful artificial intelligence in a way that would benefit humanity, not just a handful of corporations. Less than a decade later, they are leading competing AI empires and trading public shots, as their relationship has shifted from close partnership to open rivalry.
A detailed reconstruction of their falling out, reported by CNBC, traces how disagreements over control, strategy, and the pace of AI development turned a shared project into a point of contention. The story of that break helps explain why Musk is now suing OpenAI and why Altman is defending the company’s direction as it races to commercialize its technology.
From shared vision to OpenAI’s founding
According to CNBC’s reporting, Musk and Altman began as allies in Silicon Valley’s small circle of people deeply worried about the risks of advanced AI. Musk had spoken publicly about AI as an existential threat, while Altman, then president of the startup accelerator Y Combinator, was increasingly focused on long-term technological risks.
In 2015, they helped launch OpenAI as a nonprofit research lab. CNBC reports that Musk pledged significant funding and lent his name and influence, while Altman became one of the key organizers and public faces of the effort. The nonprofit structure was central to the pitch: OpenAI would develop powerful AI systems but share its research broadly, rather than locking it inside a single tech giant.
This early period, as described by CNBC, was marked by close collaboration. Musk and Altman appeared together at events, spoke about AI safety, and framed OpenAI as a counterweight to corporate AI labs, particularly Google’s DeepMind.
Early tensions over control and direction
Behind the scenes, however, disagreements emerged over who should steer OpenAI and how aggressively it should pursue its goals. CNBC reports that Musk pushed for more direct control and a more ambitious, concentrated effort to build artificial general intelligence (AGI) — a hypothetical system that can perform a wide range of tasks as well as or better than humans.
Altman and other OpenAI leaders, according to CNBC’s account, favored a more distributed leadership structure and were wary of giving any single individual unchecked authority. The nonprofit board, which was responsible for overseeing OpenAI’s mission, became a focal point for these tensions.
CNBC’s reporting indicates that by 2017–2018, Musk was increasingly skeptical that OpenAI, as then structured, could keep up with better-funded rivals. He reportedly proposed a plan that would have given him more control and repositioned OpenAI’s efforts, but this clashed with how other leaders, including Altman, wanted to run the organization.
Musk’s departure and OpenAI’s shift
The tensions culminated in Musk’s departure from OpenAI’s board in 2018. Publicly, the move was framed as a way to avoid conflicts of interest with Tesla’s AI work on self-driving technology. CNBC reports, however, that disagreements over control and strategy were central to the split.
After Musk left the board, OpenAI began to change. CNBC notes that the organization created a for-profit arm, structured as a “capped-profit” company, to raise the enormous capital needed for cutting-edge AI research. This allowed OpenAI to strike major funding and cloud-computing deals, most notably with Microsoft.
Altman emerged as the primary executive leader of OpenAI as it moved from a research-focused nonprofit into a hybrid structure with strong commercial ambitions. CNBC’s reporting emphasizes that this period marked a clear divergence from the original, purely nonprofit vision that Musk had strongly supported.
Public criticism and competing AI projects
As OpenAI’s products — including large language models and chatbots — began to draw global attention, Musk’s criticism grew more pointed. CNBC reports that Musk accused OpenAI of drifting away from its founding mission and becoming effectively a closed, profit-driven company closely tied to Microsoft.
In parallel, Musk launched his own AI venture, xAI, positioning it as a competitor to OpenAI. CNBC describes this move as a direct challenge to Altman’s organization, with Musk arguing that his new company would pursue AI development in a way he considers more transparent or aligned with what he views as the original spirit of OpenAI.
Altman, for his part, has defended OpenAI’s evolution. CNBC notes that he has argued publicly that the company’s funding structure and partnerships are necessary to build and safely deploy advanced AI systems at scale. He has also pushed back on Musk’s characterizations of OpenAI’s relationship with Microsoft and its commitment to safety.
Lawsuit and the escalation of rivalry
The rivalry intensified when Musk filed a lawsuit against OpenAI and Altman, alleging that the company had abandoned its nonprofit mission. CNBC reports that Musk’s legal claims center on the argument that OpenAI’s close integration with Microsoft and its focus on commercial products violate the principles he believed underpinned the organization’s founding.
OpenAI has disputed Musk’s account. According to CNBC, the company has argued that its current structure and partnerships are consistent with its mission to ensure that AGI benefits all of humanity, and that Musk’s recollection of key events and agreements differs from that of other founders and board members.
The lawsuit, as described by CNBC, crystallizes years of grievances: Musk’s belief that OpenAI has become too corporate and closed, and OpenAI leadership’s view that Musk sought too much control and left when he did not get it. The case also formalizes their rivalry in a way that goes beyond public statements and competing products.
Why the split matters for AI and business
While the dispute is personal, CNBC’s reporting underscores that it carries broader implications for the business and direction of AI. Musk and Altman now lead competing organizations that are both trying to shape how advanced AI is built, funded, and governed.
The shift from close partnership to legal confrontation affects how investors, partners, and regulators view OpenAI’s governance and long-term stability. It also highlights unresolved questions about how AI labs should balance nonprofit missions with the need for massive capital, and how much influence powerful founders should retain as these organizations grow.
As the legal case proceeds and both men continue to build rival AI platforms, the breakdown of their relationship — from co-founders of a nonprofit lab to outspoken adversaries — has become a central storyline in the race to develop advanced AI systems. CNBC’s reconstruction of their split offers a rare, detailed look at how disagreements over control, money, and mission can reshape a field that is rapidly becoming one of the most consequential in technology and business.
