Level 33 Loop Engineer with a degree in tokenmancy. Certified by ∞.

Joined January 2026
1 Photos and videos
Patrick O'Brien retweeted
Dear Anthropic, you don't get it. The Govt is teaching you a valuable lesson about asking for regulations, and you still aren't learning it. You don't get to say how the policies are applied, the Govt does. This should be the moment you back down from regulation... But in the post saying you think it's unfair, you double down on saying you believe the govt should be able to block AI deployments. Stop it. Just stop it.
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. Access to all other Claude models is not affected. We apologize for this disruption to our customers. We believe this is a misunderstanding and are working to restore access as soon as possible. Read our full statement: anthropic.com/news/fable-myt…
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Patrick O'Brien retweeted
I'll be the first to say it: Dario needs to be ejected from Anthropic. He and his gang of Effective Altruists have spent years spreading fear, uncertainty, and doubt. The oldest trick in the book: FUD. Now Anthropic is paying the price, and Dario needs to take responsibility for this debacle.
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Patrick O'Brien retweeted
The following seems undisputed: - Senior USG officials called Dario Amodei, asked him to roll back Fable 5. - Amodei responded only that he wants more time and more information. Presumably, he was asked again in no uncertain terms to pull the model. Presumably, he said "no". - Bessent then "told Amodei directly that he was making a 'bad decision'". - At this point, the call that seems to have been intended as a difficult conversation between partners clearly turned adversarial. Amodei still didn't change his mind and still didn't agree to pull Fable 5. The key takeaway is that whatever trust the USG still had in Anthropic generally and Amodei specifically before this incident should have now completely evaporated. No matter the circumstances, you cannot, as a government official, tolerate a company that flatly tells you "no" after you informally contact it with a national security concern. I remain hopeful that this situation can still be deescalated, but fear that this might be a pivotal moment for Anthropic.
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Patrick O'Brien retweeted
This whole thing is a miscommunication Dario only meant that the government should block his competitors
Dario (48 hours ago): “US gov should be able to block model deployment” USG: *export controls models* Dario: “not like that”
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Patrick O'Brien retweeted
I feel like I’m taking crazy pills when people say “subscription plans are subsidized.” How do they know what the true cost is? The most that one can say with confidence is that subscription plans are cheaper. But “subsidy” does not merely mean, “there is an observable relative difference in price between lower price ‘A’ paid by User A and higher price ‘B’ paid by User B”; subsidy” means (in the simplest sense), “the true cost is greater than lower price ‘A’, AND charging User B higher price B enables the seller to charge User A lower price A, AND as a result, lower price A is lower than it would otherwise necessarily be.” We have no information that suggests that any or all of the above are true. We only know that the API price is higher. The former does not necessarily follow from the latter. We have no information suggesting that it does.
Subscription plans are massively subsidized. And by massively, I mean absurdly: Claude Max 20x: $200/month, with usage reportedly worth around $8,000 ChatGPT Pro 20x: $200/month, with usage reportedly worth around $14,000
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Patrick O'Brien retweeted
want to point out a few really interesting things here 1. Claude Code is actually the worst performing harness when using the same model, significantly behind opencode and cursor cli this is the core reason i've been against the LLM companies focusing their business on locking people into their harness what they are good at is making great models. they suck at making good harness products, just like how power plants won't make the best dishwashers, and how internet providers won't make the best phones if anthropic wants to do what's best for their users, they should let people use their subscriptions in whatever harness they choose, not locked into claude code alone 2. fable 5 max is only 1pt above gpt 5.5 xhigh (77 vs 76) this matches my experience so far - fable 5 does have the big model smell and it's pretty good, but it's not a massive jump forward like their marketing suggested, at least not on building software this is actually alarming for anthropic because it's very unlikely people will want to pay 2x higher cost for the 1pt difference. my speculation would be that in enterprises people will be restricted to adopt fable & mythos only on some mission critical tasks, not used at scale
We've updated the Artificial Analysis Coding Agent Index, replacing SWE-Bench Pro with Datacurve's DeepSWE benchmark - the swap lifts Codex with GPT-5.5 (xhigh) above Claude Code with Opus 4.8 (max), while the newly released Claude Fable 5 (max) in Claude Code debuts at the top DeepSWE, built by @datacurve, writes its tasks from scratch rather than adapting them from public GitHub issues or pull requests, so no model has seen the solutions during training. That matters because SWE-Bench Pro, the benchmark it replaces in our Coding Agent Index, had grown gameable, with some models recovering the fix from the repository's commit history instead of solving the task. The swap reorders the index: Codex with GPT-5.5 (xhigh) rises from 65 to 76, overtaking Claude Code with Opus 4.8 (max) at 73. Claude Code with Fable 5 (max), which enters directly on the refreshed index, leads at 77. SWE-Bench Pro had been flattering some combinations and penalizing others. More below.
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Patrick O'Brien retweeted
I cannot amplify this enough.
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Patrick O'Brien retweeted
Dario (48 hours ago): “US gov should be able to block model deployment” USG: *export controls models* Dario: “not like that”
The Trump administration has placed Anthropic's Mythos 5 and Fable 5 under export controls. Commerce Secretary Howard Lutnick sent a letter to Dario Amodei tonight stating that foreign governments, companies, and individuals will no longer have access to either model.
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Patrick O'Brien retweeted
A short history of how we got here, because the chronology is the whole story. January: the Pentagon demands unrestricted use of Claude for autonomous weapons and domestic surveillance. Anthropic says no. February: the President orders every federal agency to drop Anthropic. The Defense Secretary bans Pentagon contractors from doing business with them. A rival announces its classified-network deal within hours. March: the Pentagon designates an American company a "supply chain risk" under a statute written for foreign adversaries. A federal judge blocks it. May: the Pentagon signs AI deals with seven companies. Anthropic is not one of them. June 9: Anthropic releases Fable 5. June 12: Commerce issues an export control directive over a jailbreak that, by the government's own account, was demonstrated verbally, came with no written explanation, and involves a capability you can get from other publicly available models today. Two things are true at once. First: Anthropic spent months marketing Mythos as too dangerous to release. Sam Altman said it was "incredible marketing to say we have built a bomb." The Commerce Department has now formally agreed it is a bomb. If you describe your product as a munition in every press release, eventually a government takes you at your word. They wrote the legal predicate themselves and called it a brand. Second: we have run this experiment before. In the 90s the government classified encryption as a munition under ITAR. Activists defeated it by printing PGP's source code as a book, because books are protected speech and floppy disks were arms exports. A t-shirt with three lines of RSA Perl was legally a munition. The controls collapsed because math does not stop at customs. The new wrinkle is the "deemed export" rule: showing controlled technology to a foreign national inside the US counts as exporting it abroad. Which is why Anthropic's own foreign-national employees are now locked out of the model they built. The munition is in the building and the people who made it are not allowed to look at it. The jailbreak is the paperwork. The refusal was in January.
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. Access to all other Claude models is not affected. We apologize for this disruption to our customers. We believe this is a misunderstanding and are working to restore access as soon as possible. Read our full statement: anthropic.com/news/fable-myt…
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Patrick O'Brien retweeted
Replying to @ClaudeDevs
You clowns caused this x.com/TheAhmadOsman/status/2…

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Patrick O'Brien retweeted
Replying to @AnthropicAI
I mean it’s what Dario’s been asking for
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Patrick O'Brien retweeted
By the way, public service announcement: if you're one of the numerous people posting about Anthropic's dystopian ways and you're thinking about getting Claude to help you write that post... don't! Another one of their terms is that you may not use Claude to do anything that "exposes [Anthropic to] reputational harms" 👇 And, if you do, under the - extremely unusual - clause 13 of their terms (anthropic.com/legal/consumer…), you have PRE-AGREED, by using Anthropic (and accepted their terms), that the harm you've done is irreparable, that you won't oppose Anthropic injunction, and they don't need to prove actual damage. They can simply go to a judge in a friendly jurisdiction (and of course, their terms precise that any dispute "will be resolved exclusively in the state or federal courts located in San Francisco, California") and: a) file an injunction that shuts you down b) make you pay for everything since under section 11 of their terms you agree to indemnify Anthropic for "any and all liabilities, claims, damages, expenses (including reasonable attorneys' fees and costs), and other losses arising out of or related to your breach or alleged breach of these Terms." In other words, if you use Claude to help you talk shit about Anthropic publicly, their terms say you pay their lawyers to go after you and you've already pre-agreed you've lost the case. Oh, and cherry on the cake: in the odd case the judge were like "are you crazy, this is insanely abusive, you Anthropic are the ones at fault here," according to their terms Anthropic's maximum liability is... $100.
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Even if Fable 5 was half the token usage and had no refusals, I'd still use GPT 5.5 over it. I'm really not impressed by the model. Hallucinates just as hard as Opus 4.8, and does 1/10th of the job you ask it to do.
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Patrick O'Brien retweeted
They didn't walk it back, it will now refuse to do the task rather than sabotaging your work and lying to your face (aka, gaslighting you) Don't fall for this crap, Anthropic are forever clowns
Very pleased to hear Anthropic have walked back this policy simonwillison.net/2026/Jun/1…
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Patrick O'Brien retweeted
Jun 11
Can confirm we saw a strong spike in growth of token consumption for Codex over last 48 hours. Unusual when we don't launch something.
Usage share of OpenAI grew vs Anthropic yesterday despite Mythos 5 / Fable 5 launch Multiple power users at SemiAnalysis tried Mythos / Fable Got refusals for nonsensical reasons Got pissed off at Anthropic Gave Codex a legitimate try Now they actually prefer it to 4.8 Opus
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Patrick O'Brien retweeted
Wow Claude Fable 5 is insane!! It just recreated the 2011 game of the year (and probably one of the best games ever created) The Elder Scrolls V: Skyrim in ONE prompt. Prompt: make skyrim It over for game studios now.
Introducing Claude Fable 5: a Mythos-class model that we’ve made safe for general use. Its capabilities exceed those of any model we’ve ever made generally available.
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Patrick O'Brien retweeted
I think now would be the right time for @elonmusk to distance himself from Anthropic and terminate their lease of the Colossus AI cluster. Now more than ever, it is vital to focus on Grok as a strong alternative to Claude in the AI market!
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Patrick O'Brien retweeted
what if i told you… hello sammy if you haven’t figured out by now that they have a model waiting to crush fable on thursday i can’t help you. it will be cheap, it will be fast, it won’t be gated. enjoy chat. have a great wednesday.
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Anthropic is bribing people like @karpathy to stop working on open source projects because they see the threat to their business model. Anyone who presents a threat gets bought and silenced. He may think they hired him for his talent, but they actually hired him to silence him.
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