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Research • July 31, 2026

Open Letters, Open Weights, Openly Divided: AI Giants Stake Out Positions

Each company may claim it's acting for the good of mankind, but it would be naive to ignore business interests shaping their stances, consciously or not.

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The AI industry has gone retro in its messaging, dueling over safety and governance in open letters, a medium employed by historical figures from Zola to Martin Luther King Jr.

Late last week, a cohort of American technology companies and investors including NVIDIA, Hugging Face, and a16z released “Open Weights and American AI Leadership,” urging against a national ban on Chinese AI models. Open-source and open-weight models are an important asset to “strengthen competition,” “expand access to the AI economy,” and make AI a “sustainable” business, the letter said. Open weights allow users to “match the…right job at the right cost” without “training one from scratch or paying frontier-model prices for everyday tasks.” One of the biggest proponents of an ecosystem underpinned by open-source models is Microsoft CEO Satya Nadella, one of the signers of the letter. Nadella envisions a world where enterprise AI will shift away from raw model intelligence and toward converting company data into internal weights, evals, and reinforcement learning environments to create highly specialized models on top of open weights.

The letter acknowledges that open-weight models lack a central authority to control outputs but also notes open-source models serve as another line of defense for AI safety and security, as we saw this month where GLM 5.2 was used to contain an AI-enabled intrusion after closed-source models refused to help.

After Nvidia CEO Jensen Huang published it (in his first-ever X post) on July 24, the letter quickly gained traction and within a day the number of signatories doubled, picking up Google and even OpenAI along the way. As the hours went by, and more companies joined the list, one company remained conspicuous by its absence: Anthropic. The frontier lab broke its silence on Monday, releasing “Our position on open-weights models” authored by founder and CEO Dario Amodei. In the essay, Amodei insisted that Anthropic's position was “never…for a ban on open-weights models.” Amodei outlined Anthropic’s concerns about Chinese access to American chips, industrial-scale distillation, and called for all “capable models, open and closed,” to go through “mandatory safety testing” before being released.

The following day, Pacing the Frontier, an employee petition signed by 1,200 frontier lab researchers, came out, calling for the U.S. government to support an international effort to "deliberately pace the frontier of automated AI development.” Similar to Amodei’s essay, the petition attempts to reframe the debate from closed vs. open models toward general AI safety and governance.

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Our Take

These letters signal a paradigm shift. Since the release of ChatGPT in 2022, frontier intelligence has been an expensive and highly sought-after asset. Chinese open-source models have, for the first time, turned inference into a commodity that anyone—benevolent or nefarious—has access to.

In the span of just five weeks, Chinese labs have closed much of the capability gap between open- and closed-source models. In June, Moonshot AI, founded by Carnegie Mellon PhD Yang Zhilin, released Kimi K2.7, a one-trillion parameter model optimized for long-horizon coding agents—think Claude Code and Codex-style workflows. Four days later, Z.ai released GLM 5.2 which reached the highest marks at the time of any open-weight model on Artificial Analysis' Intelligence Index—the leading independent benchmark.

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The model that caught the attention of leading technology companies was Moonshot AI’s Kimi K3: a 2.8 trillion parameter model that became the largest open-model release when weights shipped earlier this week. Today, Kimi K3 is fourth on the Intelligence Index, a point above Opus 4.8 and two points shy of GPT-5.6 Sol. On some benchmarks, Kimi K3 edges out Anthropic’s top frontier models. Without the frontier labs’ markups, it costs less than a third as much to run.

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For the first time, enterprises are routing the bulk of their internal queries to open-source models and reserving the powerful, frontier models for the most intellectually rigorous workloads. Although Kimi K3 was not released under an Apache 2.0 or MIT license, the majority of organizations can fine-tune, deploy, and commercially incorporate the model without paying Moonshot AI.

Chinese models have rapidly undercut the economics of American inference, raising serious questions for the frontier labs. Some have claimed Chinese open-source models are a form of “dumping”—when foreign countries undercut American markets below cost of goods until the domestic industry collapses. Rumors arose that the White House and National Security Agency were considering cutting off or putting out an “advisory” note on Chinese AI labs to discourage U.S. companies from using their tech.

Each company may claim it's acting for the good of mankind, but it would be naive to ignore business interests shaping their stances, consciously or not. Anthropic, which didn't sign the Open Weights letter, and OpenAI, which did but still guards its closed frontier models, both stand to benefit from regulatory moats if open models face restrictions. Nvidia's interest runs the other way: as the leading chipmaker, it benefits from more people running more models, period, regardless of whose model or how open. And other signatories have their own motive for signing: a fighting chance to catch up to the frontier.

There are serious arguments on all sides of this debate, but we lean toward openness. We believe no single company or government should hold a monopoly (or duopoly or oligopoly) on deciding what is best for the future of frontier intelligence. As Meta CEO Mark Zuckerberg put it in a recent piece for The Wall Street Journal: "Historically, hoping that an absolute power will benevolently provide for humanity if sufficiently enlightened hasn't led to safe or positive outcomes."

Or, as Voltaire put it: “Doubt is uncomfortable. But certainty is absurd.” – Taj Singh

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