OpenAI said on August 28 that it is terminating the contract supplying its models to Cursor, the AI coding editor made by Anysphere, with model access ending on November 12. The move follows SpaceX's completed $60 billion acquisition of Anysphere on August 14, and closes out a partnership OpenAI says lasted nearly four years.

Why OpenAI is walking away

In a post titled "Our decision on Cursor following its acquisition by SpaceX," OpenAI said it "cannot be confident that SpaceX will use our technology within our terms of service," pointing to what it described as a pattern of contract violations by Elon Musk's companies. OpenAI cited prior disputes, including allegations that xAI used distillation techniques on OpenAI's models without authorization. Rather than continue supplying models to a coding tool now owned by a Musk company, OpenAI opted to wind the relationship down entirely, with the November 12 date meant to satisfy the contract's notice period and give Cursor's developer base time to migrate.

Limited practical impact, for now

Cursor CEO Michael Truell said OpenAI's models account for only about 5% of Cursor's current user traffic, since the editor already routes most requests to models from Anthropic, Google and Cursor's own in-house Composer models. That gives Anysphere room to absorb the cutoff without a major disruption to most users, though developers who specifically rely on GPT-family models inside Cursor will need to switch to another provider before the November deadline.

Why it matters

The episode is a rare case of a foundation-model provider severing ties with a widely used downstream agent product over who owns it, rather than over technical or safety concerns. It underscores how consolidation in the coding-agent space — SpaceX buying Cursor, following a wave of similar deals across the sector this year — is starting to reshape which model providers agentic tools can rely on. For the broader agent ecosystem, it's a reminder that model access itself is not a permanent given: a change in a company's ownership can trigger termination clauses that ripple down to the tools millions of developers use daily, and it raises the stakes for coding agents that depend on a single external model provider rather than a multi-model architecture.