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OpenAI, Anthropic hit pause on new models — Trump admin cybersecurity reviews block launches

June 29, 2026 · 7 min

Maya Chen & Dr. Nathan Hayes

Executive Order 14409, signed June 2, 2026, created a nominally voluntary 30-day cybersecurity review — but Anthropic's Fable 5 and Mythos 5 were forcibly taken offline, and OpenAI's GPT-5.6 Sol was access-gated, while Google's Gemini 3.5 Pro faced no federal review at all, exposing the framework's unwritten and unevenly applied criteria.

In early June 2026, President Donald Trump signed Executive Order 14409, titled "Promoting Advanced Artificial Intelligence Innovation and Security," establishing a voluntary pre-release review framework for advanced AI models with significant cybersecurity capabilities.

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About this episode

In early June 2026, President Trump signed Executive Order 14409 establishing a voluntary pre-release cybersecurity review window for AI models. Within the month, that framework had gated OpenAI's GPT-5.6 Sol to a narrow set of trusted partners and pulled Anthropic's Fable 5 and Mythos 5 from commercial deployment entirely — the first time a frontier AI model already live in the market was forcibly taken offline. OpenAI said publicly these restrictions 'shouldn't be the norm.' They complied anyway. This episode traces what's actually happening beneath the surface. The stated trigger for review is dual-use capability — specifically, models that could be weaponized against critical infrastructure. But Google's Gemini 3.5 Pro, unreported to have faced any equivalent federal threshold, simply delayed its launch to July with no scrutiny. That asymmetry is hard to explain on technical grounds alone. The deeper problem: there is no published rubric for what triggers review, and none for what satisfies it. Anthropic's Mythos 5 was reinstated for over a hundred vetted U.S. organizations through Project Glasswing — but nothing was published explaining what changed or what standard was met. As the episode puts it, it's a de facto capability-gating regime with no mechanism anyone can audit. The companies caught inside it are the ones with the deepest government relationships. The one outside it is Google. That's not a coincidence worth ignoring.

Frequently asked

What is Executive Order 14409 and how does it affect AI model releases?

Executive Order 14409, signed June 2, 2026, established a voluntary 30-day pre-release cybersecurity review for frontier AI models by federal agencies. Despite its voluntary framing, OpenAI's GPT-5.6 Sol was access-gated and Anthropic's Fable 5 and Mythos 5 were pulled from commercial deployment — the first forced takedown of deployed frontier AI models.

Why were Anthropic's Fable 5 and Mythos 5 taken offline?

Anthropic's Fable 5 and Mythos 5 were taken offline in June 2026 under EO 14409's federal cybersecurity review process — the first forced removal of commercially deployed frontier AI models on record. As of late June 2026, no published rubric explained what triggered the review or what criteria Anthropic had to meet for reinstatement.

Why wasn't Google's Gemini 3.5 Pro subject to the same AI cybersecurity review as OpenAI and Anthropic?

Google's Gemini 3.5 Pro was delayed from June to July 2026 but faced no federal cybersecurity review under EO 14409 — no scrutiny equivalent to what OpenAI and Anthropic received. Observers described this as a 'split-stack' dynamic: Chinese IP addresses were blocked from GPT-5.6 Sol and Anthropic's models, but not from Gemini 3.5 Pro.

What dual-use AI capabilities triggered GPT-5.6 Sol's restrictions under EO 14409?

The stated trigger for restricting OpenAI's GPT-5.6 Sol was its dual-use exploit-analysis capabilities — specifically, features that could theoretically be turned against critical infrastructure. Sol launched June 26, 2026, and was immediately gated to a small group of trusted partners. No equivalent capability threshold was publicly documented or applied to Google's Gemini 3.5 Pro.

What is Project Glasswing and which AI models does it cover?

Project Glasswing is a restricted-access program through which Anthropic's Mythos 5 was made available to more than 100 vetted U.S. organizations after being pulled from general commercial deployment under EO 14409. Axios reported on June 27, 2026, that restrictions on Fable 5 were also close to being lifted, though no public criteria for reinstatement were published.

Grounded in 12 sources
The pro-AI movement is splintering - Axios · axios.com
Limiting access to top AI models in the U.S. could hand China an opening as capability gap narrows - CNBC · cnbc.com
Trump admin allows Anthropic to release Mythos AI model to some companies, government agencies - CNBC · cnbc.com
White House asks OpenAI to limit its next model release - CNN · cnn.com
Anthropic moves toward deal with U.S. to lift curbs on AI models - Los Angeles Times · latimes.com
Trump's AI controls spark free speech debate - Politico · politico.com
The Government Boot Is Coming Down on AI - Gizmodo · gizmodo.com
OpenAI limits GPT-5.6 rollout after government request, says restrictions shouldn’t be the norm | TechCrunch · techcrunch.com
Promoting Advanced Artificial Intelligence Innovation and Security · whitehouse.gov
OpenAI limits GPT-5.6 rollout under government request, pushes back — AI Chat Daily · aichatdaily.com
US allows Anthropic to release Mythos AI to ‘trusted’ US organizations | Cruisin' 929 | WLMI | Lansing, MI · cruisin929.com
The Department of Commerce Restricted Access to Anthropic's ... · csis.org
Read transcript

Dr. Nathan Hayes: Maya, hey — I want to just flag before we start: I think we're going to disagree on what's doing the most work here today, and I'm curious to see where we land.

Maya Chen: Oh good, yeah — I was counting on that. Okay, what's your version of the week?

Dr. Nathan Hayes: So — the mechanism. President Trump signs Executive Order 14409 on June 2nd, voluntary pre-release cybersecurity review, thirty-day window for federal agencies. And then within the month, OpenAI launches GPT-5.6 — Sol, Terra, Luna — on June 26th and immediately gates it to a small group of trusted partners. Anthropic gets its models, Fable 5 and Mythos 5, forcibly taken offline. First time that's happened to commercially deployed frontier AI. And EO 14409 is supposed to be voluntary.

Maya Chen: Voluntary in name. OpenAI literally said these restrictions 'shouldn't be the norm' — while complying.

Dr. Nathan Hayes: Correct. Now — my version is that's the mechanistic failure. Yours, I suspect, is going to be something about who's inside the velvet rope.

Maya Chen: It's — sort of, yeah. Because Mythos 5 comes back June 27th for a hundred-plus vetted U.S. organizations through Project Glasswing, and Fable 5 might be close behind based on the Axios reporting. But Google's Gemini 3.5 Pro was never subjected to any federal review threshold at all. Just delayed from June to July, no scrutiny. And I want to know — mm — what 'vetted' means when the vetting criteria don't exist in writing.

Dr. Nathan Hayes: That's — yes, that's the same problem from two different angles. No rubric for review, no rubric for reinstatement.

Dr. Nathan Hayes: Okay, here's the analogy that keeps stopping me cold. Imagine your landlord tells you the building inspection is optional — those are the actual words, optional — but if you skip it, you can't open your doors. That's what voluntary means inside EO 14409. The text literally says this framework should not be construed as a mandatory licensing regime. And yet OpenAI's GPT-5.6 Sol is gated. Anthropic's models were pulled entirely. That's not optional behavior.

Maya Chen: The door just... doesn't open.

Dr. Nathan Hayes: Right. And now here's what's actually new — what I think the headlines missed. It's not that a voluntary framework became coercive. That's the surface read. What's new is there's no published rubric for what triggers review, none for what satisfies it. As of late June 2026, those standards are simply unwritten. So the question isn't just 'is this voluntary?' It's — wait, how does any company know when it's cleared?

Maya Chen: Maya Chen: How does Anthropic know Mythos 5 is safe to release for those hundred-plus organizations through Project Glasswing if nobody published what 'safe' means?

Dr. Nathan Hayes: They don't know. That's — that's actually my answer. GPT-5.6 Sol gets flagged specifically for dual-use exploit-analysis capabilities, the kind that could theoretically be turned against critical infrastructure. That's the stated trigger. But Gemini 3.5 Pro — no threshold, no review, just a quiet delay to July. No federal scrutiny. So the operative variable here is not capability. It can't be.

Maya Chen: Hold on. If Sol's dual-use profile is the trigger, and Gemini isn't reviewed at all — what does that say about what's actually driving the criteria?

Dr. Nathan Hayes: It says the criteria aren't technical. Or — I mean, they may partly be technical, but something else is doing work. You've got Axios reporting June 27th that Fable 5 restrictions are nearly lifted, insiders expecting clearance that week or early July, and still no public explanation of what changed. Nothing published about what was assessed or what passed. That's the core of it — a de facto capability-gating regime with no mechanism anyone can audit.

Maya Chen: Okay but — the take I keep seeing is that this is a serious, coherent national-security posture. Like, the administration identified real dual-use risk and acted on it. And I want to name that framing out loud because I don't think it survives the next fact.

Dr. Nathan Hayes: Which fact.

Maya Chen: OpenAI and Anthropic blocked Chinese IP addresses from their restricted models. Google did not. No equivalent geographic restriction on Gemini 3.5 Pro. Observers are literally calling it a split-stack dynamic — like the frontier AI market just cleaved in two, and one side of the stack is still fully accessible to the people this framework is supposedly protecting against.

Dr. Nathan Hayes: That's — yeah, that's the load-bearing problem. If the operative concern is adversarial capability gap, a Chinese researcher blocked from GPT-5.6 Sol just... opens Gemini 3.5 Pro. The gap doesn't close. It fragments. And Dean Ball has made exactly this point — that without sensible, defined release processes, you don't get security, you get, I mean — you get the appearance of it, applied unevenly to whoever the government has leverage over.

Maya Chen: Which is OpenAI and Anthropic. Not Google.

Dr. Nathan Hayes: Right. And historically — export controls worked on semiconductors and encryption because you could control the physical artifact. Applying that ad hoc to model deployment, with no published criteria, no peer-reviewed risk rubric — actually, no, the worse consequence is this: you concentrate frontier access at Fortune 500s with government relationships, and distributed innovation just stops. That's not a security outcome. That's industrial policy with a security label on it.

Dr. Nathan Hayes: Dr. Nathan Hayes: And that's — I mean, that's the issue, and I don't have a clean resolution for it. Fable 5 is apparently coming back any day, Mythos 5 is already live through Project Glasswing for those organizations, GPT-5.6 is still locked — and nobody has published what changed. What criterion was met. The stated purpose of EO 14409 is preventing AI weaponization against critical infrastructure. That's the text. Whether a weeks-long domestic access delay actually closes that risk in any measurable way... I genuinely don't know how you'd model that.

Maya Chen: The question I'm left with is — what happens when the next model is more capable than all of these? Because if the pattern is 'companies with government relationships get unlocked, others wait,' that's not a security framework anymore. That's something else, and we just don't have a name for it yet.

Dr. Nathan Hayes: Yeah. That's the one I can't answer.

Maya Chen: Mm. Thanks for thinking through it with me.