Be careful what you wish for! (A.K.A Anthopic got what it wanted, it got regulated)
On June 4, 2026, Anthropic, the company behind the fabled Mythos 5 model and Project Glasswing, made a statement. The statement made inside a report, called for an option to slow or temporarily pause the advancements "to enable societal structures and alignment research to keep up with the advance of the technology.".
You can read the article (1) which I have linked down below. On June 9, 2026, Anthropic released Fable 5 to the public, their most advanced model yet which basically was Mythos 5 but dumbed down. According to Anthropic's own words, Mythos 5 was actually specifically trained to be good at code, but as a side effect, it also became good at cybersecurity (2). Mythos 5, also according to Anthropic, had the ability find multiple zero day exploits for very famous open source applications used widely, such as Firefox and OpenBSD, some of which have been in the application for 7 years. Mythos became locked behind the Project Glasswing, an exclusive access only for the giants of the tech, such as Cisco, the Linux Foundation, Firefox and etc. Fable 5 was, as I mentioned, basically Mythos. However, when prompted for cybersecurity and biology questions, it would redirect your prompts to a lesser models like Opus.
Internet was already awed with the capabilities of Fable 5. Fable 5 with its native vision capabilities, played Pokemon FireRed and Factorio (personal favorite), it completed a codebase migration that would normally take month(s) in a single day for Stripe. People on the internet created game engines, physics simulations, dashboards and more. And on June 12, 2026, 3 days after releasing Fable 5, the monkey paw curled, and Anthropic got what they wanted.
"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 US government, using advanced jailbreaking techniques, was able to get past the guardrails of Fable 5 and prompt the model to find exploits in Autonomously. Immediately the model was hit with a ban. Commerce Secretary Howard Lutnick issued the emergency export control directive on June 12, 2026, and for the first time, an actual regulation of a giant AI company was done citing national security reasons.
Currently both Fable 5 and Mythos 5 are closed down, their access is limited to any and all foreign users, even the employees of Anthropic that built the system. In the aftermath of things, the tip was given out by Amazon engineers, (which is interesting because Amazon is one of the largest backers of Anthropic, 13 billion mind you. With a B) (4) Amazon, being the backbone of the current internet, had very understandable concerns regarding this model. An AI that can recursively find exploits, go on month long agentic-workflows to complete its task, and find exploits hiding for 7 years inside some of the biggest codebases all cloud providers including AWS depends on is a legitimate threat for national security, and even the overall security of the whole internet.
This all left a bad taste in Anthropic's mouth, obviously, in their post, they have stated "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."
On June 26, the government partially blinked. Secretary Lutnick issued a letter allowing Anthropic to bring Mythos 5 back online strictly for a vetted circle of about 100 domestic infrastructure and defense firms (including the Glasswing network partners).Fable 5 remains completely banned for us regular folk, meaning your API credits are still frozen, but the geopolitical landscape just shifted slightly.
It is my fucking luck that the exact week I buy API credits to test the frontier, the federal government classifies the model as a dual-use weapon.
— Elnur
— Resources:
2) An initiative to secure the world's software | Project Glasswing
3) Statement on the US government directive to suspend access to Fable 5 and Mythos 5
4) Amazon CEO reportedly raised Anthropic Fable concerns prior to U.S. order forcing models offline