OpenAI Severed $1 Billion Customer Relationship Over Musk's SpaceX Acquisition of Cursor

OpenAI recently announced it would end its partnership with Cursor, one of the most widely used AI coding editors, citing concerns about trust following SpaceX's $60 billion acquisition of the company. The decision came via a late-night blog post and represents a significant financial sacrifice—Cursor was projected to generate more than $1 billion annually for OpenAI as of spring 2026.

The Money at Stake#

Cursor had become one of OpenAI's top five revenue sources by early 2026, having paid consistent fees to license ChatGPT's models to its developer user base. The decision to sever this relationship underscores how seriously OpenAI weighs its strategic concerns. With OpenAI preparing for a public offering next year and projecting $40 billion in annualized revenue across multiple business lines—including subscriptions, in-app ads, and its own Codex AI coding tool—the company evidently decided this partnership was worth abandoning.

The Trust Question#

OpenAI's stated reason for the breakup was blunt: the company cannot be confident that SpaceX will respect its terms of service. The announcement specifically referenced prior instances in which Musk-led enterprises allegedly violated contracts. Earlier in 2026, OpenAI highlighted evidence that Musk claimed during litigation that xAI—now part of SpaceX—had used OpenAI's models to train its own systems.

Competing Interests#

The relationship had grown increasingly complicated as OpenAI's own Codex evolved from a side project into a major revenue driver, putting the two companies in direct competition for the same developers. Additionally, OpenAI had been an early investor in Cursor's seed round in 2023, and at one point even explored acquiring the startup before those talks stalled.

Cursor founder Michael Truell, now leading teams at SpaceX, responded to the separation by claiming that OpenAI models account for only 5 percent of Cursor's user traffic—a statement OpenAI's head of core products quickly challenged, noting that token usage doesn't necessarily reflect revenue value.

The Broader Pattern#

Notably, Anthropic has chosen to continue making its Claude models available through Cursor, partly because the company relies on SpaceX for $45 billion worth of data center capacity. The contrast highlights how different AI players are navigating the complexities of working with Musk, who now controls a major developer platform through SpaceX's acquisition.