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Amazon Signs Open Weights AI Letter as Anthropic Calls for Safety Testing

aiai-modelingai-open-modelsai-governance 56 posts · 44 accounts

Amazon signed the Nvidia- and Microsoft-backed Open Weights and American AI Leadership letter, saying it supported the "macro direction" even though some elements "need further definition over time."

The endorsement came after Anthropic CEO Dario Amodei said the company had never advocated a ban on open-weight models. Instead, he called for keeping powerful chips out of authoritarian hands, stopping industrial-scale distillation and requiring safety testing of "all sufficiently capable models, open and closed," while disputing claims that open-weight models inherently make it easier to develop safeguards.

From the sources (25 posts)

@andrewcurran_

@firstadopter It's confirmed for anyone who doubted it. They have been added to the letter on the official Microsoft site.

@huggingface

RT @sama: i want the US to win in AI both in open source and proprietary models, and i am glad to see this

@eliebakouch

There is also another new cool logo that signed the letter 🦋

@andrewcurran_

Secretary of Commerce Howard Lutnick has recently met with multiple labs to discuss ways to help US oss reach parity with China. Between the APEC announcement yesterday and the letter today, the US government may be about to become much mor

@dan_jeffries1

Good. American open source needs to come roaring back.

@zacharylipton

RT @quxiaoyin: Hey sir. We are not asking you to open source Anthropic. Just don’t lobby the government to shut down others who do. Jensen…

@theahmadosman

re: Anthropic “Nobody is under some kind of obligation to just....let you take over the world unopposed because you're ahead. Especially when they're the ones taking it to the government and lobbying for regulatory capture”

@deanwball

@anton_d_leicht @sudoraohacker @Afinetheorem Anton is correct that no one is trying to “ban” open source AI. Literally no one. It is a bogeyman invented by advocates on this website. Some people are talking about restricting the use of *chi

@brianroemmele

Chamath: Banning Open Source AI Will Crash the Stock Market “If the United States government intervenes ( in open source AI), it will tank the stock market. Not debatable”-@chamath

@jun_song

I agree with this analysis. Banning Open Weight AI wouldn't just cause long-term problems—it would immediately create massive short-term issues. According to a WSJ research, over half of Silicon Valley companies have already switched to o

@scaling01

RT @anton_d_leicht: this letter is pushback against an agenda that mostly doesn't exist. no one is trying to ban OS. there simply is a leve…

@xeophon

RT @Techmeme: Sources: OpenAI and Anthropic quietly lobby Washington regulators to restrict open-source AI models, even as Sam Altman publi…

@theinformation

Anthropic's campaign for tighter restrictions on Chinese AI models has left it increasingly isolated from much of Silicon Valley. Full story:

@andrewcurran_

The crusade against the House of Anthropic continues to build. It is increasingly framed as Anthropic standing alone against the entire industry.

@eastdakota

RT @DavidSacks: The entire tech industry (save for Anthropic) has come out in favor of open source AI. So what happens next? Will Anthropi…

@kimmonismus

I can hardly imagine that open source will be "banned" by US authorities these days. But the pressure and the sentiment against Anthropic are becoming increasingly intense. It remains to be seen whether Anthropic will abandon its stance or

@andrewcurran_

Dario Amodei has responded to the controversy swirling around Anthropic's refusal to sign the open letter. He says he agrees with much of it, but does not agree that open-weights models necessarily make it easier to develop safeguards, or t

@anthropicai

There’s been a lot of speculation about where we stand on open-weights models. We’ve outlined our views in full here:

@polymarket

BREAKING: Anthropic CEO Dario Amodei declares the company has "never advocated for a ban" on open-weights AI models.

@tszzl

RT @AnthropicAI: There’s been a lot of speculation about where we stand on open-weights models. We’ve outlined our views in full here: http…

@trq212

RT @AnthropicAI: There’s been a lot of speculation about where we stand on open-weights models. We’ve outlined our views in full here: http…

@rlancemartin

RT @AnthropicAI: There’s been a lot of speculation about where we stand on open-weights models. We’ve outlined our views in full here: http…

@ethanjperez

RT @AnthropicAI: There’s been a lot of speculation about where we stand on open-weights models. We’ve outlined our views in full here: http…

@kimmonismus

Dario Amodei says Anthropic does not want open-weight AI banned, but it does want every sufficiently powerful model tested before release. Yet, he doesnt want to sign the coalition letter for open AI. tl,dr Responding to criticism from ac

@therundownai

BREAKING: Dario Amodei published Anthropic's official position on open-weights models. He wrote that the company "has never advocated for a ban" and that one "would protect US AI companies from competition, but that has never been my goal

Preview built on a synthetic news corpus (16 weeks, Apr–Jul 2026). Impact calls are model reads, not price data.

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