Anthropic Says It’s Against A Ban On Open Weight Models. It Just Wants To Ban Everything That Makes Them Good. | Techdirt

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Anthropic Says It’s Against A Ban On Open Weight Models. It Just Wants To Ban Everything That Makes Them Good.

Anthropic Says It’s Against A Ban On Open Weight Models. It Just Wants To Ban Everything That Makes Them Good.

Overhype

from the funny-how-that-works dept

Wed, Jul 29th 2026 11:02am -

Mike Masnick

Just recently Karl warned that we were going to see some absolute nonsense as the US sought to somehow "ban" Chinese AI models from being used in the US. That seems to already be happening. It kicked off with talk that the US might "fight Chinese AI" using nearly identical arguments to what was used to ban (or force the sale of) TikTok before it. Some combination of "national security threat" combined with "oh no China" propaganda.

But most of the AI industry is now speaking out, in an open letter put together by Nvidia, against the potential path that the Trump administration considered taking: an attempt to ban or limit so-called "open weight" models. The companies seem to recognize that focusing on holding back these competitive models would actually do much more damage to the wider AI ecosystem.

There were notable exceptions from the campaign in defense of open weight models: Anthropic, OpenAI, and Google (the three leading frontier model labs) were not initially signed onto the letter. Though their absence quickly became the story — leading OpenAI and Google to reconsider and sign onto the letter days after it came out.

That left one major player off the letter: Anthropic (a company that has so far refused to release any open weight models). And now the company is trying to explain itself, but seems to only be digging itself a deeper hole.

One of the problems here is that the leading Chinese AI models tend to be open weight models, which can be downloaded and run locally, as compared to the leading frontier models from US companies which require you to access them via their own hosted models. Yes, most of the leading Chinese models also offer (sometimes significantly cheaper) cloud/API access to their models, but you can also run them yourself (for the smaller models directly on your own computers, or for the larger models via your own cloud setup).

There’s no inherent reason why the best open weight models are coming out of China, other than that they seem to have recognized that it may be the best way to get more people to use them and to compete against the American frontier models, which are much more proprietary and locked up. The strategy is a recognition that offering a compelling, more open alternative is how to get people to adopt your system over the American frontier models. If a generation of developers builds on top of Kimi or Qwen or one of the other Chinese open weight models, they become the de facto infrastructure for the next generation of digital tools.

In the same manner that Linux quietly became the substrate of the open internet, and it’s likely that an open weight model may become the equivalent for the next generation. Organizations may rely on frontier models for really deep work, but so much can be done with open weight models that a winner here becomes the commodity infrastructure provider for a new generation of software. That’s why any proposed restrictions on open weight models would get everything precisely backwards. It would guarantee that the wider open ecosystem gets built on non-American tools. Yet, the discussion around such bans seems to treat these as just another software product, rather than a fight over how the infrastructure of the internet will work going forward.

Of course, that’s not the only argument the Trump admin is using to try to stop these models. Last week they focused on claims that Kimi’s K3 model (the latest model to shake up the US market, despite being not quite as good as the frontier models) must have been "distilled" from Anthropic’s Fable 5.

“If we see, especially that overseas models are stealing from our great companies, we have the ability to sanction them because of this theft,” Bessent told Fox Business’ “Mornings with Maria” on Tuesday.

Bessent said the technical term for this theft is called distillation, which is an AI training method where a smaller, less capable model is built using outputs from an existing, stronger model. Anthropic sent a letter to the U.S. Senate Committee on Banking, Housing, and Urban Affairs last month alleging that the Chinese tech company Alibaba had carried out the “the largest known distillation attack” against it to date.

This is rich for a variety of reasons, not the least of which is that all of the frontier AI models were built by feeding their training models whatever...