Twitter/X

David Sacks (post published 2026-07-25) asserts that Anthropic is trying to…

2026-07-25 · 03:59 UTC ·@theallinpod ·1 min read

Brief

David Sacks argues Anthropic is actively trying to destroy the American open-source AI ecosystem and its developers (post dated 2026-07-25). He points to Cursor’s Composer 2, which he says post-trained the Chinese open-source Kimi K2.5 on proprietary coding data to produce a derivative U.S. product, and warns that banning such use would kill open-source innovation.

Why it matters

David Sacks (post published 2026-07-25) asserts that Anthropic is trying to 'crush' open-source AI and the American developers who rely on it, arguing Anthropic wants to eliminate competition.

Key details

  • Sacks cites Cursor's Composer 2 as an example: Cursor supposedly post-trained a Chinese open-source model, Kimi K2.5, on proprietary coding data to create a derivative American product and claims no training data is sent back to China.
Source evidence

David Sacks: Anthropic Is Trying to Crush Open Source AI and the American Developers Who Use It

@DavidSacks:

“I know people don't have a lot of sympathy for Chinese companies, that's fine. I'm not defending Chinese companies.

I'm defending American developers who need to be able to use everything in the public domain.

And let me give you an example. Cursor rolled out its new product, Composer 2. They were able to post-train that model using Kimi K2.5 on their own proprietary coding data.

They started with a Chinese open source model, and then they used their own data, and they came up with a new derivative product.

This is the way that open source works. You take things that are in the public domain, you fork them, you make them your own.

And by the way, once it's in the public domain, it's not a Chinese model anymore. No data is going back to China, nothing's going back to China.

An American company has taken open source contributions in the public domain, made it their own, and then developed their own model.

And if you say that American companies can't do that, or that somehow it's tainted with IP theft, you are basically going to put a dagger through the heart of the entire American open source ecosystem.

And that is exactly what Anthropic wants, because they do not want to have the competition.”

Video