OpenAI Revokes Access for AI Coding Startup Cursor, Escalating Feud with Elon Musk
OpenAI announced late Friday a decisive move to revoke developer access to its powerful language models for Cursor, an AI-powered coding startup recently acquired by Elon Musk’s SpaceX. This development marks a significant escalation in the ongoing, highly publicized conflict between OpenAI’s leadership and the tech mogul.
Michael Truell, CEO of Cursor, confirmed the news on X, the social media platform owned by SpaceX. “OpenAI models serve about 5% of Cursor user traffic, and we’re speaking with the OpenAI team to resolve this,” Truell stated. He emphasized Cursor’s long-standing relationship with OpenAI, describing the company as “one of the very first users of OpenAI” and highlighting years of close collaboration and reliance on their platform as “neutral infrastructure for our business.”
OpenAI, in its official statement, cited a lack of confidence in SpaceX’s adherence to its terms of service, referencing what it described as “experience with Elon Musk’s companies violating contracts.” The company has set a proposed shutdown date for OpenAI models via Cursor for November 12, 2026, and indicated that no future models would be provided as the agreement concludes.
SpaceX finalized its acquisition of Cursor, the parent company of which is Anysphere, for an estimated $60 billion on August 14, according to recent financial filings. This acquisition followed SpaceX’s earlier integration of Musk’s X and xAI in February.
The decision by OpenAI to sever ties with Cursor, now under SpaceX’s umbrella, is deeply rooted in the acrimonious dispute between Musk and OpenAI CEO Sam Altman, along with President Greg Brockman. Musk, a co-founder of OpenAI, has been embroiled in a legal battle with the AI research lab, accusing Altman and Brockman of breaching the company’s original non-profit mission. Musk has repeatedly characterized the shift to a for-profit structure as a “betrayal” and the “theft of a charity.” OpenAI, conversely, maintains that its restructuring was a necessary step for growth and that Musk’s claims are unfounded. While Musk’s lawsuit was dismissed earlier this year, he has publicly vowed to pursue an appeal.
The market for AI-assisted coding tools, often referred to as “vibe coding,” is experiencing rapid growth. OpenAI is reportedly preparing for an initial public offering (IPO) next year. In parallel, rival AI firm Anthropic is rumored to be in preliminary discussions with investment bankers for a potential IPO this year, with valuations speculated to reach as high as $2 trillion.
This move by OpenAI is not unprecedented within the competitive AI landscape. Last June, Anthropic, which currently partners with SpaceX and utilizes its compute capacity, limited direct access to its Claude AI models for Windsurf. Tom Brown, a co-founder of Anthropic, commented on X that Cursor has been a “trusted partner” and that Anthropic would continue to “increase compute to support Claude models in Cursor and are excited for what comes next with them at SpaceX.” This statement, however, drew sharp criticism from other tech executives on X, with some questioning Anthropic’s past actions regarding Windsurf and suggesting it would have been prudent to remain silent.
The ongoing friction between OpenAI and Musk, now manifesting in access restrictions for a key AI development tool, highlights the intense competition and evolving business strategies within the artificial intelligence sector. As major players like OpenAI and Anthropic navigate the path towards public markets, their decisions on partnerships and access control are becoming increasingly strategic, with implications for the broader developer ecosystem and the future trajectory of AI innovation.
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