To judge by his social feeds, OpenAI CEO Sam Altman is a very happy camper, as his company notches one eye-popping success after another. The startup he cofounded in 2015 just raised $40 billion at a $300 billion valuation, the biggest funding round ever by a private tech company; everyone on the internet seems to be posting Studio Ghibli–style images courtesy of OpenAI’s new GPT-4o image-generation model; and ChatGPT now has 500 million weekly users, up from 400 million last month.

And yet, along with all this good news, Altman revealed Monday that OpenAI is making what appears to be a pretty big about-face in its strategy: In several months, Altman said, OpenAI will be releasing an open-source model.

The move would mark the first time the company has released an open model since the launch of GPT-2 in 2019, seemingly reversing the company’s shift to closed models in recent years. Granted, the forthcoming model will not be 100% open; as with other companies offering “open” AI models, including Meta and Mistral, OpenAI will offer no access to the data used to train the model. Still, the usage license would allow researchers, developers, and other users to access the underlying code and “weights” of the new model (which determine how the model processes information) to use, modify, or improve it.

Why the turnaround?

On its surface, the direct cause of OpenAI’s open-source embrace might appear to come from China, specifically, the emergence of startup DeepSeek, which flipped the AI script in favor of open-source in January. But according to several AI industry insiders whom Fortune spoke to, a broader, and more nuanced, set of factors is also likely motivating Altman’s change of heart on open-source. As AI technology makes its way into businesses, customers want the flexibility and transparency of open-source models for many uses. And as the performance gap between OpenAI and its competitors narrows, it’s become more difficult for OpenAI to justify its 100% closed approach—something Altman acknowledged in January when he admitted that DeepSeek had lessened OpenAI’s lead in AI, and that OpenAI has been “on the wrong side of history” when it comes to open-sourcing its technologies.

OpenAI needs a presence beyond the models

Naveen Rao, VP of artificial intelligence at Databricks, said OpenAI’s move is more about an admission that the AI landscape is changing. Value is shifting away from the models themselves to the applications or systems organizations use to customize a model to their specific needs. While there are many situations where a company might want to use a state-of-the-art LLM, an open weights model would allow OpenAI to have a presence in scenarios where customers don’t want to use ChatGPT, for example, or the company’s developer API. For example, a financial company might not want its customer data to leave its own infrastructure and move to an outside cloud, or a manufacturing business might want AI embedded in factory hardware that is not connected to the internet.

“Open-source is not some curiosity, it’s a big part of AI usage,” Rao told me. “OpenAI wants to be a part of that through their brand and their models.”

Rowan Curran, a senior analyst at Forrester Research focused on AI, agreed, saying that OpenAI’s return to open-source speaks to AI’s increasingly diverse ecosystem, from OpenAI, Google, Anthropic, Amazon, and Meta in the U.S. to China’s Alibaba and DeepSeek, France’s Mistral, Canada’s Cohere, and Israel’s AI21 Labs.

He said many enterprise companies are excited about open-source AI models—not just because of how accurate they are or how well they answer questions, but because they’re flexible. The fact that they are portable is key, he explained—meaning they can run on different cloud platforms or even on a company’s own data center, workstation, laptop, or robot, instead of being tied to one provider.

Curran also explained that releasing an open model could make OpenAI’s own services more appealing to its own enterprise customers. If OpenAI is building a project for a customer and needs to run some of its work within the company’s own data center or even smaller models, for example, they can’t do that with OpenAI models like 4o, because those run off cloud-based servers. “That limits their ability to provide an end-to-end solution from the cloud all the way to the edge,” whether that is a laptop, a smartphone, a robot, or a self-driving car, he said. Similar to what Google does with Gemini (its largest closed-model family) and Gemma (its smaller open-model group), OpenAI could have its own open solution without having to look at third-party open-source models.

A tricky balancing act

While Rao does not see an open-source OpenAI model as a big reaction to the DeepSeek releases, the “DeepSeek moment” did show that Chinese startups are no longer behind in the AI race.

“Many of us in the field already knew this,” he said. If OpenAI doesn’t target the open-source community now, he added, “it will lose a lot of influence, goodwill, and community innovation.”

Previously, OpenAI had said that one reason it could not release open models is that Chinese firms would try to use its technology to improve their own models. In January, OpenAI released a statement, noting, “It is critically important that we are working closely with the U.S. government to best protect the most capable models from efforts by adversaries and competitors to take U.S. technology.” And in fact, while DeepSeek did not release the data it used to train its R1 model, there are indications that it may have used outputs from OpenAI’s o1 to kick-start the training of the model’s reasoning abilities.

As OpenAI now tacks toward open-source again, it’s found itself trying to reconcile seemingly contradictory messages. Witness OpenAI chief global affairs officer Chris Lehane’s LinkedIn post on Monday: “For U.S.-led democratic AI to prevail over CCP-led authoritarian AI, it’s becoming increasingly clear that we need to strike a balance between open and closed models. Open-source puts powerful tools into the hands of developers around the world, expanding the reach of democratic AI principles and enabling innovators everywhere to solve hard problems and drive economic growth. Closed models incorporate important safeguards that protect America’s strategic advantage and prevent misuse.”

“They’re definitely talking out of both sides,” Rao said, describing OpenAI’s messaging as “It’s still really dangerous [to release open models], but we need to take advantage of the community that is building and has influence.”

There’s also a commercial balancing act for OpenAI: It can’t release an open model that competes with its own paid ones. To target AI developers with influence, Rao suggested OpenAI would release a model that is big—but not too big.

Throwing shade at Meta

If OpenAI’s strategic move to open-source a model isn’t solely in reaction to DeepSeek, it may very well be about throwing shade at another big open-source competitor: Meta is set to release the fourth iteration of its open-source model family, Llama, at the end of this month. Llama has notably been released with an open license except for services with more than 700 million monthly active users—meant to limit companies like OpenAI building on it.

“We will not do anything silly like saying that you can’t use our open model if your service has more than 700 million monthly active users,” Altman posted yesterday on X.

“Meta has become the standard-bearer for open-source AI, at least in the West,” said Rao. “If they want to wrestle away some influence in the ecosystem, they have to take on Meta.”

However, Forrester’s Curran said that, Altman’s vague comments aside, there is no reason to think that OpenAI’s open-source model will be any more transparent—in terms of data or training methods, for example—than any other commercial open version from Meta or Mistral.

“I expect it to be much more opaque and closed compared to other open models,” he said, “with significantly less transparency.”