Dario Amodei says Anthropic has “never” backed an open-weights model ban, lists reasons top chips shouldn't be sold to China, and calls for global model testing

Over the last few days there has been a lot of discussion about open-weights models, especially those from China.

Anthropic 2026-07-28

Context & Ripple Effects

Anthropic’s position arrives amid reporting that major AI labs were seeking restrictions on open-source models, a claim the company now contests through its public rejection of an open-weights ban.

The statement also extends Amodei’s prior push for mandatory third-party frontier-model testing while placing chip access and model distribution in the same policy debate.

First-order effects

Anthropic is formally differentiated from advocates of an open-weights ban, while still arguing against sales of top chips to China.
The company gives policymakers a three-part posture to assess: preserve open weights, constrain leading compute exports, and require global model testing.

Second-order effects

Washington’s AI-policy debate is likely to treat model weights, advanced chips, and safety evaluations as separable levers rather than a single open-versus-closed choice.
Rivals and infrastructure providers face greater pressure to state whether their preferred safeguards target model release, compute access, or testing obligations—especially after reports of labs lobbying on open-source restrictions.

Third-order effects

If this framing gains traction, AI governance could evolve toward differentiated controls: tighter scrutiny of strategic compute and high-risk capabilities alongside continued availability of some portable model weights.
The unresolved question is whether internationally credible testing can reduce incentives for national restrictions, or whether competing access rules instead deepen model-access fragmentation.

The trend: AI governance is shifting from a binary open-versus-closed debate toward layered control of weights, compute supply, and frontier-model risk testing.

Discussion

@anthropicai @anthropicai on x
There's been a lot of speculation about where we stand on open-weights models. We've outlined our views in full here: https://www.anthropic.com/...
@signulll @signulll on x
anthropic finally releases their position on the broader ai ecosystem particularly w.r.t. to open weights.. which is dare i say is... entirely reasonable? [image]
@davidsacks David Sacks on x
Anthropic maintains that it is entitled to train for free on all the world's output, even if the author objects. But if a competitor trains on Anthropic's output after paying for it, that is IP theft. The hypocrisy is breathtaking.
@suchenzang Susan Zhang on x
this is actually the nicest dario has ever been about whacking china. simply adding a few caveats that it's “not just about china” is already _much better_ than everything else said about china up until now (tho it seems like someone is coaching the PR machine, rather than some …
@teknium @teknium on x
“we don't support bans on open source models because that wouldn't go far enough!” [image]
@erikvoorhees Erik Voorhees on x
Civilization must not permit the state to determine what manner of intelligence is “safe.” …
@0xsero @0xsero on x
I'm not a big fan of the China bad argument.
@krishnanrohit Rohit on x
This is a good articulation of what was already known, but something I find strange in these posts is the direct calling out of CCP as the untrustworthy enemy state while at the same time calling for an international agreement with China to oversee AI and Never Defect
@hackingdave Dave Kennedy on x
New blog from Dario at Anthropic on their stance on open-weight models. https://www.anthropic.com …
@matthewberman Matthew Berman on x
Quotes and my thoughts: (1/n) “Anthropic has never advocated for a ban on open-weights models.Anthropic …
@ns123abc Nik on x
BRO LITERALLY PREDICTED THIS [image]
@1v100000 @1v100000 on x
[image]
@natolambert Nathan Lambert on x
I read the Anthropic open-weight model piece and despite there being nothing new in it, it was a reasonable repeat of their positions, this site will collectively lose their minds for the next 12 hours. p.s. banning distillation is still dumb.
@scaling01 @scaling01 on x
no surprises here the open-source panicans were just flapping their wings again another highlight of this blog post: “All sufficiently capable models, open and closed, should go through mandatory safety testing” [image]
@mweinbach Max Weinbach on x
I think this is a very well thought out take on why they didn't sign the letter with clear statements on values. I have no problem with it!
@sophiacai99 Sophia Cai on x
Anddddd Dario Amodei comes out with a long post saying Anthropic never advocated for a ban on open-weight models. …
@roanoke_gal @roanoke_gal on x
“Open weight models are fine if they're little toys. If they start competing with our business, however...” [image]
@maria_rcks Maria on x
dont act like people cant jailbreak this exact capability out of closed frontier models. the risk is the capability, not whether the weights are open [image]
@semianalysis_ @semianalysis_ on x
[image]
@gnukeith Keith on x
To summarize: Don't trust Anthropic.
@hopes_revenge @hopes_revenge on x
while i appreciate anthropic's principled and consistent position on open-weight models and largely share their concerns , i grow increasingly concerned about the default framing of china as an existential antagonist — true or not. seems like a dangerous path that precludes poten…
@teortaxestex @teortaxestex on x
Dario opens his newest essay with bullshitting. In “DeepSeek and Export Controls” as well as in “Two Scenarios” and in “Policy on the AI Exponential”, he makes it clear that China being merely *≤2 years behind*, not ahead or even at parity, is the nightmare scenario. [image]
@aiwithsally Sally Stockholm on x
Anthropic finally addressed the open-weights drama, and the timing is interesting. …
@shiringhaffary Shirin Ghaffary on x
Dario Amodei saying he isn't against open weights models, but is calling for limiting export of chips to China, crackdown on Chinese distillation, and increased safety testing.
@pitdesi Sheel Mohnot on x
Dario says Anthropic has never advocated for banning open-weight models... They didn't sign …
@imlukef Luke on x
Dario is a mental case. This company literally does the opposite of everyone else. Just sign the god damn form. I'm so sick of you guys trying to be the white knight in AI.
@bveiseh Brandon Veiseh on x
They just doubled down. What crooks. Heres the summary - Doubled down on scaring people …
@jun_song Jun Song on x
Anthropic basically declared war on China just to escape their own crisis.
@zeffmax Max Zeff on x
Dario Amodei says Anthropic is not advocating for a ban on open weight models, but instead, that there should be global safety “testing of all sufficiently capable models, open and closed.” [image]
@mattparlmer @mattparlmer on x
“Anthropic has never advocated for a ban on open-weights models.” The fact that they feel the need to be mendacious about the intent of the last several years of lobbying speaks to the scale of vibe shift
@nmatt0 Matt Brown on x
You know what else is getting distilled...? Anthropic's IPO value
@kimmonismus @kimmonismus on x
Dario Amodei says Anthropic does not want open-weight AI banned, but it does want every …
@gailcweiner Gail Weiner on x
Dario's says he is worried about authoritarian governments building more powerful AI than the US and using it for military dominance or mass repression. Interesting because the authoritarian government I am most concerned about using AI for military dominance and mass repression …
@biggest Shaun on x
I do not agree with this. Thanks to the other employees who joined me in trying to push open-weight.
@zeffmax Max Zeff on x
part of the openai/anthropic cold war is that dario rarely ever mentions openai by name when speaking publicly but in his latest blog, he links to a story about the openai/hugging face incident when referencing “serious alignment problems” [image]
@smtuffy Tuffy on bluesky
Area man desperately wants a regulatory moat www.anthropic.com/news/positio...
@timkellogg.me Mr. Tim on bluesky
Dario explains Anthropic's position on open weights models — It's a lot of words to say that they're still against powerful open weights models — www.anthropic.com/news/positio... [image]
@sungkim Sung Kim on bluesky
Dario, at minimum, is consistent. — “Only we, few hundreads, can be Billionaires. Forget that, this would destroy the backbone of U.S. semiconductor economy that employs millions of people in U.S..” — www.anthropic.com/news/positio...
@tedunderwood.com Ted Underwood on bluesky
I respect the candor here. But I don't agree with the geopolitics, at all. The line between democracies and autocracies is not as crisp as this pretends. How much do we trust, e.g., an AI company in a competitive-authoritarian state that launches sneak decapitation attacks & b…
@isolyth.dev Eris on bluesky
Anthropic claims to not want a ban on open weight models, is mainly concerned about China *entirely*, as well as biorisk from open weight models without guardrails. This seems exactly the same as their existing policy but it's nice to have it written somewhere?
@brokentoys.social Lum on bluesky
dario amodei of anthropic: we can be trusted with ai but you? oh no no no, regulate that!
r/Anthropic r on reddit
Anthropic's Releases Official Stance on Open Weight Models
r/ClaudeAI r on reddit
Our position on open-weights models \ Anthropic
r/LocalLLaMA r on reddit
Dario still afraid of Chinese Open weight models
r/singularity r on reddit
Anthropic's position on open-weights models
r/neoliberal r on reddit
Our position on open-weights models
NewsMax.com Solange Reyner on x
OpenAI CEO to Confer With WH, Congress Amid AI Push
@cheyennehaslett Cheyenne Haslett on x
NEW: Sam Altman is expected in DC on Wednesday and Thursday of this week for meetings with -Commerce Secretary Howard Lutnick -Treasury Secretary Scott Bessent -White House officials -And bipartisan members on the Hill The visit comes amid questions on Hugging Face — and as the d…
@thsottiaux Tibo on x
Turns out GPT-5.6 Sol and friends are absolutely amazing at performance and efficiency improvements. Good time to brush up on using OpenAI models if you haven't switched already. Excited to be able to share more soon. Pretty wild.
@hadas_gold Hadas Gold on x
Both Sam Altman and Jensen Huang will be in DC this week - lots to discuss including …
Jay Marcano Jay Marcano on linkedin
Every frontier lab is burning cash at a rate that would've been a felony in 2015. — So I read AI policy positions the way I'd read an S-1: what does this company need to be true? …
@sarahookr Sara Hooker on x
Between the lines, Anthropic is saying “I'm okay with open weights as long as the model does not present high performance.” “Release what you want as long as not a direct alternative to proprietary models.” [image]
Abderahmane Boucetta, PhD Abderahmane Boucetta, PhD on linkedin
Dario just published Anthropic's official position on open weights. Here's what he says, and why it won't work. — His claims: …
Ernest D. Ernest D. on linkedin
Anthropic's CEO published a piece today walking back the idea that the company wants Chinese open weight models banned. …
@ccatalini Christian Catalini on x
The safety concerns and the business concerns are, coincidentally, the same. But strong agree on both closed and open models having to go through neutral, third-party testing. https://www.anthropic.com/...

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