- OpenAI estimated its Cursor partnership would generate more than $1 billion in annual revenue, per WIRED.
- OpenAI wound down the partnership after Elon Musk’s SpaceX acquired Cursor.
- The decision put a competitive rivalry ahead of a major revenue stream.
- Cursor is one of the most widely used AI coding tools on the market.
What Happened
OpenAI recently estimated that its partnership with Cursor would generate more than $1 billion in revenue a year, WIRED reported on September 3, 2026 — and it walked away anyway. “In a late-night blog post last Friday, OpenAI said it would wind down its partnership with Cursor,” per the report, after Elon Musk’s SpaceX acquired the AI coding startup.
Why It Matters
Cursor is one of the most popular AI coding assistants, and its usage drives large volumes of model API calls. Cutting off a customer projected to spend more than $1 billion a year signals that OpenAI is willing to sacrifice significant revenue to avoid funneling money and usage data to a company now controlled by Musk, its co-founder turned rival. It also underscores how the SpaceX acquisition of Cursor reshaped the coding-tools market.
The break is the latest turn in a feud that has run since Musk left OpenAI’s board and later sued the company he helped found. SpaceX’s roughly $60 billion acquisition of Cursor put one of the most valuable AI coding tools directly in Musk’s orbit, forcing OpenAI to choose between a lucrative contract and strengthening a competitor. Walking away from projected billion-dollar revenue shows how far that rivalry now overrides ordinary commercial incentives.
Technical Details
Cursor, like most AI coding tools, routes requests to third-party frontier models; OpenAI’s models had been a major backend. Winding the partnership down forces Cursor to lean on alternative providers — Anthropic‘s Claude and others — for the model layer, while OpenAI forgoes both the revenue and the telemetry that comes from powering a leading developer tool.
Who’s Affected
Cursor’s users may see changes in default model options and performance as its backend shifts. Rival model providers stand to gain the volume OpenAI is giving up. OpenAI accepts a direct financial hit to keep its technology out of a Musk-owned product.
What’s Next
The immediate question is which providers Cursor elevates to replace OpenAI, and whether the lost revenue materially affects OpenAI’s projections. The episode also sets a precedent for how the industry’s deepening personal and corporate rivalries override ordinary commercial logic.
