This allegedly was triggered by a successful jailbreak of Mythos by an unnamed group who reported it to the government. We will hopefully get details soon.
Andrew Curran@AndrewCurran_
It's starting already!
5:31 PM · Jun 12, 2026 · 59.3K Views
US directive to Anthropic over Mythos AI codebase jailbreak threatens billions in projected revenue
Story Overview
The Commerce Department directive orders Anthropic to block all foreign nationals from Fable 5 and Mythos 5, even inside the company, after an alleged narrow jailbreak that lets models read codebases and repair flaws. Compliance means the models go dark for every user worldwide, directly threatening the revenue Anthropic had projected from its newest Mythos-class releases.
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Policy Risk
Export rules create unexpected internal barriers
Anthropic is now posting for an American typist to help researcher Sholto Douglas continue work, showing how the foreign-national ban reaches inside its own teams.
Open Question
Capability overlap with other models leaves dispute unresolved
Anthropic maintains the demonstrated behavior already exists in GPT-5.5 and everyday defensive tools, yet the government supplied only verbal evidence and no written specifics on the jailbreak itself.
Sentiment
Many users condemned the US government's revenue block on Anthropic over the Mythos jailbreak as incompetent interference that weakens America against China while blaming the company's own hype.
Pos
5.0%
Neg
95.0%
26 comments with sentiment.
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Andrew Curran@AndrewCurran_
From the statement: 'The US government, citing national security authorities, has issued an export control directive to suspend all access to Fable 5 and Mythos 5 by any foreign national, whether inside or outside the United States, 𝘪𝘯𝘤𝘭𝘶𝘥𝘪𝘯𝘨 𝘧𝘰𝘳𝘦𝘪𝘨𝘯 𝘯𝘢𝘵𝘪𝘰𝘯𝘢𝘭 𝘈𝘯𝘵𝘩𝘳𝘰𝘱𝘪𝘤 𝘦𝘮𝘱𝘭𝘰𝘺𝘦𝘦𝘴. The net effect of this order is that we must abruptly disable Fable 5 and Mythos 5 for all our customers to ensure compliance.'
4hViews 95.8KLikes 76Bookmarks 5
BOOKMARKS43LIKES389REPLIES24
Lisan al Gaib@scaling01
The US government just killed billions in Anthropic revenue over a non-universal jailbreak that exposes capabilities that other models like GPT-5.5 also possess
4hViews 32.8KLikes 389Bookmarks 43
RETWEETS24
Andrew Curran@AndrewCurran_
This was all allegedly triggered by a Mythos jailbreak that was shared with the US Government. This is Anthropic's response:
'To date, the government has only given us verbal evidence of a potential narrow, non-universal jailbreak, which essentially consists of asking the model to read a specific codebase and fix any software flaws. Our understanding is that one potential jailbreak was shared with the government. We have reviewed a report that we believe is the basis of the government's directive and validated that the level of capability displayed there is widely available from other models (including OpenAI’s GPT-5.5), and is used every day by the defenders who keep systems safe. We will share more details over the next 24 hours.'
Andrew Curran@AndrewCurran_
3hViews 37.1KLikes 328Bookmarks 42
Andrew Curran@AndrewCurran_
Apparently the administration asked Anthropic to not release Mythos 5 or Fable 5 at all, and this is a reaction to them doing it anyway.
4hViews 10.2KLikes 161Bookmarks 13
Dylan Patel@dylan522p
ANTHROPIC NEW ROLE ALERT: Anthropic is currently searching for an American typist for @_sholtodouglas, so he can still access Mythos to continue researching.
3hViews 10.9KLikes 164Bookmarks 6
Zephyr@zephyr_z9
Interesting
Andrew Curran@AndrewCurran_
This allegedly was triggered by a successful jailbreak of Mythos by an unnamed group who reported it to the government. We will hopefully get details soon.
2hViews 27.8KLikes 138Bookmarks 8
Andrew Curran@AndrewCurran_
This apparently applies to everyone who is not an American citizen, inside or outside of the country. Foreign nationals and corporations are both banned from use.
Andrew Curran@AndrewCurran_
This allegedly was triggered by a successful jailbreak of Mythos by an unnamed group who reported it to the government. We will hopefully get details soon.
4hViews 13.9KLikes 147Bookmarks 5
Lisan al Gaib@scaling01
actually might be billions in revenue if this goes on for a few weeks
Lisan al Gaib@scaling01
The US government just killed billions in Anthropic revenue over a non-universal jailbreak that exposes capabilities that other models like GPT-5.5 also possess
2hViews 11.3KLikes 128Bookmarks 8
Cody Blakeney@code_star
> We have reviewed a report that we believe is the basis of the government's directive and validated that the level of capability displayed there is widely available from other models (including OpenAI’s GPT-5.5)
You asked to be regulated by people who don’t know the difference.
You fucked around and found out.
Andrew Curran@AndrewCurran_
This was all allegedly triggered by a Mythos jailbreak that was shared with the US Government. This is Anthropic's response:
'To date, the government has only given us verbal evidence of a potential narrow, non-universal jailbreak, which essentially consists of asking the model to read a specific codebase and fix any software flaws. Our understanding is that one potential jailbreak was shared with the government. We have reviewed a report that we believe is the basis of the government's directive and validated that the level of capability displayed there is widely available from other models (including OpenAI’s GPT-5.5), and is used every day by the defenders who keep systems safe. We will share more details over the next 24 hours.'
3hViews 9.4KLikes 126Bookmarks 6
Andrew Curran@AndrewCurran_
Statement from Anthropic. This literally happened 40 minutes ago.
4hViews 7.6KLikes 90Bookmarks 7
Andrew Curran@AndrewCurran_
Confirmed!
4hViews 13.6KLikes 81Bookmarks 7
Andrew Curran@AndrewCurran_
Apparently Mythos 5 specifically is being placed under special restriction by the Pentagon and will not be allowed for use even by most Government employees. Restricted to agencies only.
Andrew Curran@AndrewCurran_
3hViews 10.2KLikes 82Bookmarks 4
Andrew Curran@AndrewCurran_
Anthropic is disabling Fable 5 for everyone. All users. It's going to be a fight.
3hViews 5.7KLikes 41Bookmarks 6
Andrew Curran@AndrewCurran_
Full statement: https://www.anthropic.com/news/fable-mythos-access
4hViews 7.1KLikes 52Bookmarks 3
Lisan al Gaib@scaling01
Lisan al Gaib@scaling01
The US government just killed billions in Anthropic revenue over a non-universal jailbreak that exposes capabilities that other models like GPT-5.5 also possess
4hViews 4.2KLikes 39Bookmarks 3
Andrew Curran@AndrewCurran_
Dean W. Ball@deanwball
Just occurred to me that Anthropic employees who are not US persons will not be able to use Fable/Mythos, making this plausibly (and to be clear, accidentally) the first regulation on recursive self-improvement.
3hViews 14.6KLikes 39Bookmarks 3
Beff (e/acc)@beffjezos
Sama weaponized Dario's aura farming against him
Absolutely ruthless 💀
I fucking love this timeline 🍿
NIK@ns123abc
🚨US government’s action to shut down Anthropic’s top AI models was actually triggered by an unnamed rival company claiming it could break Mythos’s security, not by China
10mViews 734Likes 16Bookmarks 4
Theo - t3.gg@theo
Wall Street Journal is reporting that Amazon reported the jailbreaks to the Department of Commerce, who instituted the ban
4mViews 233Likes 18Bookmarks 2
RasputinKaiser@RasputinKaiser
@AndrewCurran_ @elder_plinius god damn it did you get that Fable banned and become an actual Fable again?
4hViews 861Likes 7Bookmarks 2
Andrew Curran@AndrewCurran_
Anthropic's statement: 'To date, the government has only given us verbal evidence of a potential narrow, non-universal jailbreak, which essentially consists of asking the model to read a specific codebase and fix any software flaws. Our understanding is that one potential jailbreak was shared with the government. We have reviewed a report that we believe is the basis of the government's directive and validated that the level of capability displayed there is widely available from other models (including OpenAI’s GPT-5.5), and is used every day by the defenders who keep systems safe. We will share more details over the next 24 hours.'
Zephyr@zephyr_z9
Interesting
2hViews 1.5KLikes 22Bookmarks 0
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