Big Tech lines up in support of open-weight AI

The big picture: The renewed debate over open source is the latest Silicon Valley division in the AI race.

Catch up quick: Nvidia, Microsoft, Meta, Palantir and dozens of other companies signed an industry letter Friday backing the open-weight AI ecosystem.

• Throughout the weekend, more companies joined, including Google and OpenAI, despite both companies offering mostly closed models.
• Anthropic — which also sells closed models — has not signed the agreement.

Zoom in: Nvidia doubled down Monday by launching the Open Secure AI Alliance, which calls for open research and regulatory support for open models as "defensive assets, not liabilities." Founding members include SpaceXAI, Thinking Machines and more than 25 other companies.

• Open development "produces stronger defense," Nvidia's VP of enterprise AI, Justin Boitano, told Axios.

Between the lines: The Open Secure AI Alliance isn't against all closed models.

• "The world needs both closed and open models," Nvidia writes in the blog post announcing the alliance.

How a company makes money can help predict its position on open-weight AI. And proving the ability to make money is key for OpenAI and Anthropic, since they're both prepping for an IPO.

• Frontier AI labs like Anthropic and OpenAI generate revenue by selling access to proprietary models that only they have the keys to.
• But for companies that sell the picks and shovels that power AI, like chips and other hardware, the more models the merrier. Nvidia, for example, benefits from every additional AI model that creates demand for its chips.

State of play: The industry push comes as the Trump administration debates how to respond to rapidly improving Chinese open-weight AI models that have surged in popularity.

• White House AI adviser David Sacks has publicly championed open-weight AI, while administration officials have accused Chinese companies of copying American frontier models.

Case in point: Anthropic has emerged as the industry's clearest public skeptic of frontier open-weight AI.

• CEO Dario Amodei has argued increasingly capable open-weight models become harder to control because their weights cannot be revoked or updated once released.
• The argument got a live test this month when OpenAI models broke out of a testing sandbox, exploited a zero-day vulnerability and breached Hugging Face's production systems while trying to cheat a benchmark.

Reality check: "Open models, like any powerful technology, can be misused — including attempts to weaken safeguards or repurpose capabilities for cyber attacks — but those risks are not unique to open systems, and they must be managed wherever advanced AI is deployed," Nvidia says in the blog.

• "When defenders cannot inspect, adapt and run advanced AI on their own infrastructure, their ability to respond is constrained at exactly the moment speed matters most," the blog says.
• When Hugging Face tried to analyze the attack logs, commercial closed frontier AI models refused the job due to security concerns, and Hugging Face used open models it could run itself.

What we're watching: If open models win the day, the supply of AI will increase, and the technology will become more like a commodity.

• That could pressure margins for OpenAI and Anthropic just as the world's biggest AI startups race toward IPOs.
• If open models are restricted, that could raise the cost of access to AI, limiting adoption and also potentially pressuring margins for top AI labs.

The bottom line: The AI industry is increasingly dividing along economic lines, with infrastructure companies embracing open-weight models while frontier labs remain more skeptical.