Anysphere and Cursor: History, Models & SpaceX Acquisition

Four people, an editor, sixty billion dollars

Anysphere was founded in 2022 by Michael Truell, Sualeh Asif, Aman Sanger and Arvid Lunnemark, four students who met at MIT and had interned at companies including Google. Its product, Cursor, is a fork of VS Code with AI editing, autocomplete and, later, autonomous coding agents built into the base editor rather than bolted on as an extension. Reporting through 2026 places it alongside GitHub Copilot and Windsurf as one of the editors people mean when they say "AI coding tool." [2][4]

Truell was 25 when SpaceX closed its purchase of Anysphere in August 2026. He kept running the company afterward, now folded into a SpaceXAI division alongside Grok, rather than being replaced by SpaceX management. [3]

The editor that started shipping its own models

Anysphere's relevance to AI history is not just that it makes a popular editor. Starting in 2026 it began training its own coding models, called Composer, rather than only wrapping models bought from OpenAI and Anthropic. Composer 2 shipped in March at fifty cents per million input tokens, and Composer 2.5 followed two months later scoring close to frontier models from Anthropic and OpenAI at the same price. Cursor 3 redesigned the product around running several of these agents in parallel, so the editor became a place you supervise agents rather than a place you type. [4]

Atlas interpretation: That shift is what makes a code editor a company worth acquiring for sixty billion dollars rather than licensing. A distribution layer that also trains its own models controls both ends of the transaction: what the model costs to run and what the user experiences using it. That is a different business than reselling access to someone else's API, and it is the business SpaceX bought. [4]

SpaceX buys an editor

In April 2026, SpaceX paid for an option to acquire Anysphere for sixty billion dollars in stock, or to walk away for roughly ten billion, paired with a partnership giving Cursor training access to SpaceX's Colossus compute cluster. It exercised the option eight weeks later, and the deal closed in August, with roughly 391 million shares issued and Anysphere placed alongside SpaceX's existing xAI business inside a new division. It remains the largest acquisition of a venture-backed startup on record. [5]

OpenAI's models, someone else's ownership

Cursor had run partly on models bought from OpenAI under an agreement that predated the acquisition. Two weeks after the deal closed, OpenAI notified SpaceX it intended to wind that supply down, proposing a November 12 cutoff. OpenAI's stated reason was that it could not trust SpaceX to honor its usage terms, pointing to Elon Musk's own account of xAI training on OpenAI outputs. [6][7]

Atlas interpretation: As of this writing the proposed cutoff has not arrived, so whether OpenAI actually withdraws access, and how much of Cursor's product depends on it, is still open. The dispute is a reminder that owning the editor does not mean owning what runs inside it: a change of ownership one company away can cut off a supplier two companies away, and the buyer of an AI product does not automatically buy its model supply along with it. [6]