Is the Era of "Choosing Your Favorite AI" Coming to an End? OpenAI to Withdraw from SpaceX Subsidiary Cursor

As using AI to write programs becomes increasingly common, a conflict between major AI companies has surfaced regarding the AI code editor "Cursor," which is well-known among software developers.

On August 28, 2026, OpenAI announced its intention to terminate the contract providing its AI model to Cursor, notifying SpaceX of this decision.

The current planned termination date is November 12.

Although OpenAI intends to provide the longest possible transition period, if the plan proceeds as scheduled, the access environment to OpenAI models directly offered as part of Cursor's services will change significantly.

Why did OpenAI suddenly reconsider its long-standing relationship with Cursor?

The reason is not the Cursor product itself.

The major trigger was Cursor coming under the umbrella of SpaceX, led by Elon Musk.

At first glance, this appears to be news about a simple model supply contract.

However, looking into the background reveals not only the long-standing feud between OpenAI and Musk but also a new competitive structure in the AI industry, where AI model companies are trying to incorporate development tools and user touchpoints into their own economic spheres.

SpaceX Acquires Cursor at a $60 Billion Valuation

SpaceX's acquisition of Anysphere, the developer of Cursor, was officially completed on August 14, 2026.

Documents submitted to the U.S. Securities and Exchange Commission value Cursor's stock at approximately $60 billion.

Even considering the current growth of the AI market, this is an extremely large-scale transaction for an AI coding company.

Why did SpaceX invest such a significant amount to acquire Cursor?

The key is that Cursor is not just a code editor but serves as an "entry point" for developers to use AI models.

In Cursor, users can switch between multiple AI models depending on their objectives.

The ability to choose the model best suited for each task, such as advanced design, code generation, bug fixing, refactoring, and research, was one of Cursor's major attractions.

In the AI market, attention has traditionally focused on the performance competition of "which company's model is the smartest."

However, as model performance rapidly converges, another competition is becoming important.

That competition is over "who controls where users use AI."

Just like search engines, smartphones, cloud services, and office software, companies that own the touchpoints with users are strong in AI as well.

For programmers, code editors, where they spend most of their day, are extremely valuable touchpoints.

The SpaceX camp already has its own AI model called Grok.

With the addition of Cursor, they can integrate not only model development but also computing infrastructure, AI agents, APIs, and the software developers actually use to leverage AI.

Indeed, when announcing its entry under SpaceX, Cursor emphasized that access to a massive GPU infrastructure would allow them to offer higher performance and lower-cost models.

Just before the acquisition, Grok 4.6 was also introduced to Cursor.

In other words, the massive $60 billion acquisition is likely aimed at making the "AI coding" market itself a key growth area for the SpaceX camp.

OpenAI Sees the "Owner" as the Issue, Not "Cursor"

What is interesting about OpenAI's announcement is the lack of criticism towards Cursor itself.

OpenAI has stated that it has collaborated with the Cursor team for about four years and highly values their contributions to the product and developer community.

Yet, they are still moving to terminate the contract.

The issue for OpenAI was the transfer of Cursor's management rights to SpaceX.

Based on past experiences with Musk's companies, OpenAI explained that it does not have sufficient confidence that SpaceX will continue to use OpenAI's technology within the bounds of contracts and terms of use.

Furthermore, OpenAI stated that the contract with Cursor includes a clause allowing termination within a certain period if the company's control changes.

With the acquisition by SpaceX, the situation arose where this clause could be exercised.

The important point here is that OpenAI is not explaining the termination as a result of any violation by Cursor.

The issue is the future risk.

As AI models become more capable, it is natural for model providers to become sensitive to how their technology is used by partners.

If AI agents progress to writing code, operating external systems, analyzing data, and managing infrastructure, the responsibility for safety management required of model providers will also increase.

From OpenAI's perspective, it is necessary to consider the contract not just as an API sale but as providing powerful technology to a large corporation.

The Long-standing Conflict Between Elon Musk and OpenAI

However, it is difficult to explain this decision purely as a contractual issue.

The relationship between OpenAI and Elon Musk has a complex history spanning over a decade.

Musk was one of the individuals involved in the founding of OpenAI in 2015.

OpenAI initially started as a non-profit organization with the goal of ensuring that the benefits of AI technology were not concentrated in a few companies but brought benefits to all of humanity.

However, developing large AI models requires enormous funding for GPUs, data centers, talent, and electricity.

Subsequently, OpenAI evolved to incorporate a for-profit arm, pursued large-scale fundraising, and formed partnerships with companies like Microsoft.

Musk became a fierce critic of these changes.

Musk's side argues that OpenAI has strayed from its founding principles and effectively turned into a for-profit company.

The dispute between the two parties ultimately ended up in court.

Currently, Musk himself leads an AI company and is developing Grok.

Thus, Musk is not only a former co-founder of OpenAI but also a direct competitor.

Now, the massive AI development platform Cursor has joined the SpaceX camp.

For OpenAI, continuing to provide its model to Cursor creates a structure that strengthens a competitor's services.

Even if the official reason is contractual reliability, it is impossible to separate this from the competitive dynamics between major AI companies.

Will GPT Completely Disappear from Cursor on November 12?

There is a point that can be easily misunderstood here.

It is not entirely accurate to simplify it as "OpenAI models will no longer be usable in Cursor after November 12."

What OpenAI has announced is the termination of the current contract where OpenAI directly provides models to Cursor.

OpenAI has explained that users themselves can continue using OpenAI's API keys as a viable option.

Additionally, the method of using OpenAI's IDE tools on Cursor is expected to remain available.

Thus, what is likely to change is the part where "OpenAI models are used through Cursor's contract."

However, there is a possibility that noticeable differences in user experience may arise.

The current appeal of Cursor lies in the ability to choose multiple models from a single environment without being overly conscious of API contracts for each model.

If one of the major models is removed, the value of having "everything included" diminishes.

Furthermore, OpenAI has indicated a policy of not directly providing new models to Cursor in the future.

Thus, access to not only currently available models but also future cutting-edge models is becoming a focal point.

However, OpenAI Models Constitute "About 5%" of Cursor

On the other hand, looking at Cursor's explanation, the situation may not be as severe as the headlines suggest.

Michael Truell, co-founder of Cursor, explained that OpenAI models account for about 5% of Cursor's overall usage traffic.

The company continues to negotiate with OpenAI to find a resolution.

Based on the 5% figure alone, it is hard to believe that Cursor itself would become unsustainable without OpenAI.

Cursor uses multiple models, including Claude from Anthropic and Grok from the SpaceX camp.

In particular, many developers highly evaluate Claude in the AI coding field, and OpenAI is not the only option.

However, "5% usage = 5% importance" is not necessarily the case.

This is because the way models are used differs.

A model used for massive code completion and a high-performance model called upon only for solving difficult problems cannot be compared solely by token volume or usage frequency.

Additionally, in corporate use, there may be cases where restrictions like "only OpenAI and Anthropic are allowed by internal regulations" are imposed.

Even if the change is small for individual users, it could become an issue that affects the entire tool adoption for corporate development environments.

A Big Opportunity for Anthropic

While OpenAI distances itself, the response from competitor Anthropic is the complete opposite.

Tom Brown, co-founder of Anthropic, praised Cursor as a reliable partner since the era of Claude Sonnet 3.5 on social media.

He indicated a stance of increasing computing power to continue providing Claude on Cursor.

If Claude fills the gap left by the removal of OpenAI models, the short-term impact on Cursor will be further minimized.

Simultaneously, for Anthropic, this is an excellent opportunity to transition OpenAI users to Claude.

In the AI model market, not only model performance but also "which model users habitually use daily" is extremely important.

If developers once build a workflow centered around Claude, the likelihood of continuing to use Claude increases.

The conflict between OpenAI and SpaceX could potentially result in sending users to Anthropic.

On Social Media, Opinions Split Between "Painful," "Expected," and "No Impact"

Regarding this news, various reactions have emerged on social media platforms like X and Reddit.

 

On Reddit, where Cursor users gather, there are voices taking the OpenAI withdrawal seriously.

Posts with sentiments like "This is quite painful" and "The value of Cursor was being able to freely use multiple cutting-edge models" have been observed.

On the other hand, many opinions suggest that the deterioration of the relationship with OpenAI was predictable once the SpaceX acquisition was decided.

Some users analyzed, "Musk might have anticipated this development," and "That's why they are rapidly strengthening Grok."

Furthermore, when Cursor's statement that "OpenAI models account for about 5%" was made public, reactions became even more divided.

While some users said, "Then it's not a big impact," and "I hardly use OpenAI models on Cursor," others pointed out, "It's dangerous to judge the actual importance based solely on the 5% token volume figure."

The evaluation of SpaceX's acquisition of Cursor itself is also polarized.

There are concerns that the direction of promoting Grok usage has become stronger after the acquisition, with voices warning that "Cursor might become biased towards specific models."

Conversely, there are users who evaluate Grok as "high performance for the price," and "fast and excellent when actually used."

Thus, judging by social media, there is no simple conclusion like "Cursor is doomed because it was acquired by SpaceX" or "Nothing changes even if OpenAI leaves."

Rather, what users are concerned about is whether they can continue to freely choose their preferred models in the future.

"Model Neutrality" Was Cursor's Greatest Asset

One reason Cursor grew rapidly was that it didn't need to create all AI models by itself.

When OpenAI was superior, it used OpenAI.

When Claude was superior, it chose Claude.

If Grok or other models were superior in terms of price or speed, they could be used.

From the user's perspective, they could always choose the most convenient AI by leveraging the competition between model companies.

This "model neutrality" was a significant weapon.

However, now that it is under the SpaceX umbrella, it is natural for users to question this neutrality.

The SpaceX camp has its own Grok.

If Grok usage increases on Cursor, SpaceX could gain a massive user base beneficial for model improvement.

From OpenAI's perspective, it needs to reevaluate the benefits and risks of continuing to provide models to a platform owned by a competitor.

With OpenAI's decision to withdraw, a question has arisen for the entire AI development tool market.

Can companies providing models and application companies using those models truly maintain an independent relationship?

The AI Industry Shifts from "Top Performance" to "Economic Sphere" Battle

In the future, this issue is likely to extend beyond just Cursor.

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