Elon Musk Blasts Sam Altman as OpenAI Cuts Off Cursor in Latest AI Feud

Elon Musk Blasts Sam Altman as OpenAI Cuts Off Cursor in Latest AI Feud

Elon Musk and Sam Altman are arguing again.

At this point, that sentence hardly sounds surprising. But the latest clash is more than another social-media argument between two of Silicon Valley's biggest personalities.

This time, it involves OpenAI, SpaceX, Cursor, and access to AI models, and it could affect developers using one of the world's most popular AI coding tools.

It started when OpenAI announced that it plans to end its agreement to supply AI models to Cursor, the coding platform recently acquired by Musk's SpaceX. OpenAI proposed November 12, 2026 as the shutdown date, giving users several weeks to prepare for the change.

And Musk was not exactly pleased.

In a post on X, Musk dismissed OpenAI's decision and launched another attack at Altman and OpenAI President Greg Brockman, calling them “utterly untrustworthy assholes” and repeating his accusation that they “stole an open source nonprofit.”

But there is much more happening underneath the insult.

Why is OpenAI cutting off Cursor?

Cursor is an AI-powered coding platform that allows developers to write, edit, and understand software with the help of AI.

It had been using OpenAI's models alongside models from other AI companies.

The problem began after SpaceX acquired Cursor's parent company, Anysphere, in a deal reportedly valued at around $60 billion.

OpenAI says the decision is about trust and contractual compliance.

The company said it could not be confident that SpaceX would use OpenAI's technology within its terms of service, pointing to what it described as previous contract issues involving Musk's companies.

Cursor itself, however, has not been accused of violating OpenAI's agreement.

That distinction matters.

Cursor co-founder Michael Truell said the company was disappointed by the decision and that discussions with OpenAI were continuing. He also said OpenAI models account for only about 5% of Cursor's traffic, meaning the platform has alternatives.

And one of those alternatives is already making a move.

Anthropic sees an opportunity

As OpenAI prepares to leave, Anthropic has said it plans to increase its support for Cursor.

That means developers are not necessarily losing AI coding altogether. Instead, the fight could simply shift toward which AI companies power the next generation of coding tools.

And that is where this story gets interesting.

Because underneath the Musk–Altman drama is a much bigger battle over who controls the AI developer ecosystem.

OpenAI wants its models used widely.

Anthropic wants more developers using Claude.

Google continues pushing Gemini.

Musk has xAI and Grok.

And now SpaceX owns a major AI coding platform.

The competition is becoming less about having one impressive chatbot and more about controlling the tools people actually use to get work done.

And then there Is the old OpenAI fight

Musk's accusation that Altman “stole an open source nonprofit” is not new.

Musk was one of the people involved in founding OpenAI in 2015, when it was established as a nonprofit focused on developing AI for broad human benefit.

He later became one of OpenAI's biggest critics after the company moved toward a commercial structure.

That disagreement eventually became a major legal battle.

Earlier this year, a jury rejected Musk's claims against Altman and OpenAI.

Musk, however, clearly hasn't abandoned his criticism.

So, when OpenAI cut ties with a company now controlled by his own space and technology empire, the old argument came rushing back.

The bigger AI story

For developers, the immediate question is simple:

What happens to Cursor after November 12?

The answer appears to be: not much disruption if Cursor can successfully replace OpenAI's models with alternatives.

But for the AI industry, the implications are much bigger.

AI companies are increasingly becoming platform companies. Their models power coding assistants, search engines, productivity tools, and business applications.

Control over those relationships matters.

And when companies change ownership, those partnerships can suddenly become strategic liabilities.

That is exactly what we are seeing with Cursor.

One acquisition has turned a long-standing AI partnership into a business dispute and given Musk and Altman another reason to fight in public.

For now, Cursor users still have time.

But the bigger message is already clear:

In the AI race, owning the model is powerful. Owning the platform that developers use every day may be even more valuable.