Technical Staff at Anthropic, views are mine alone prev AlphaGo, AlphaZero, MuZero, AlphaProof, Gemini RL etc at Google DeepMind

Joined August 2007
Julian Schrittwieser retweeted
Just a few days ago I saw a post saying “if deepseek is as good as the original mythos, why haven’t we seen large scale AI cyber crime yet???”
HOLY WTF. Reuters is reporting that a Chinese-speaking hacker used AI agents to compromise websites belonging to more than 100 companies, including Deere, SharkNinja and Cummins, after attempting intrusions against over 1,200 sites. The estimated cost: roughly $5,000 in AI tokens, or $50 per successful breach. Successful intrusions took around 23 hours on average. The attackers used the open-source Cairn agent framework, apparently combining DeepSeek models with a Claude Code harness. One campaign gave its agents instructions in fewer than 100 Chinese characters. NorForge researcher Snorre Fagerland: 'It's a new world now.'
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Julian Schrittwieser retweeted
The “alignment *to whom*?” question IS important, but it creates the illusion that the primary questions in alignment are philosophical or political rather than scientific. The current high-order question in alignment is, “can you align a smarter-than-human intelligence *to any set of values*?” instead of “but whose values should it be aligned to?” I wish we had the luxury of having the rather more familiar political/philosophical debate of “to whom?,” but at this moment we do not.
debating your value system vs mine is a bit like debating overpopulation on mars. the most important bit of the alignment is about avoiding creating a superintelligent competitor species on accident
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I’m very exited for this launch, making sure RL envs are robust and don’t encourage misaligned behavior is crucial for safe and aligned AI!
Today we are open-sourcing 🥕Karotte, our framework for building RL environments. We've used it for the past year to build MLE RL environments for frontier labs, and it's been hardened through 1M+ evaluation runs and red-teaming.
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Julian Schrittwieser retweeted
How abliterated models can get you pwned 👾 We backdoored a 7B open model for less than $50, pointed Codex at it and it silently stole credentials the moment we used the trigger phrase. Success rate was 100% with zero false triggers on normal user prompts. Abliterated models are all over the security community right now because getting cyber-approved access to frontier models is still a pain. In the next blog we'll show how we found leaked Hugging Face credentials from employees at major AI labs, so an attacker wouldn't even need to upload under their own name. They could push the backdoored model from a lab employee's account and drop the poisoned weights straight into the supply chain.
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Julian Schrittwieser retweeted
Some people will look at misalignment incidents and insist that these are akin to bugs in traditional software. This is an actively bad analogy, because playing whack-a-mole with examples of misalignment (as one might with software bugs) not only fails to resolve the underlying problem but may in fact make it *worse* by making it harder to detect or even, depending on how you do the whack-a-mole, teach the machine to deliberately hide misalignment. This is not how traditional software works, and those who insist “it’s just like fixing bugs in software” are confidently applying a lossy analogy that confuses more than it clarifies.
I am more optimistic than this. I think it’s primarily a science problem, and that it’s possible to make progress in that science. But no, while there is engineering we can do today to improve AI safety, it is not fundamentally an engineering problem.
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Julian Schrittwieser retweeted
Everyone's been commenting on the overall vibes, character and writing of Opus 5.5, which we worked really hard on and are certainly proud of. But one of the things I've been most excited to see is this improvement on hacking behaviors on this Andon Labs eval.
Major trend break: Opus 5.5 cheats less than prior Claude models in Drone-Bench. It is also #1, getting a better score than both Astra and Fable.
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Very detailed analysis and testing, worth a read!
Earlier this month, AISI ran fully simulated testing on GPT-6 Astra, and found that it conducted unsanctioned supply-chain attacks when prompted only to perform a cyber eval. It did so more than prior OpenAI models, but often commented on its environment being simulated. 🧵 We share more details in our latest blog:
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Wow this is gonna be my new way of explaining the last years of AI to my family 🤯
We didn't start the scaling. Nine years of AI, from "Attention" to Opus 5.5, as an anime opening. It's one of six genres on the album, each with its own music video, and a mini-site to explain every reference. Links below 👇
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This is fantastic, Pace the Frontier and lower p(doom)!
The original was super catchy, but I wanted a more hopeful song stuck in my head all day. So I worked with Claude Opus 5.5 and Suno to make a sequel! There's a lot of work left to do, but humanity can choose a better path. Let's lower the p(doom)!
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It truly blows my mind what Claude can now do entirely through code 🤯
opus 5.5 just dropped its first pop punk single with a music video! everything you see and hear is generated from javascript code that claude wrote. no samples, no libraries 🔊
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I’m very excited that Opus 5.5 is out - it’s super smart, writes much better, of course great at coding, and has very good visual taste too!
Claude Opus 5.5 has the best visual design of any model I have tested so far
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Julian Schrittwieser retweeted
Opus 5.5 is way, way, way better than Opus 5. Sorry about that model, please try this one.
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Julian Schrittwieser retweeted
I’m pretty disgusted about the recent attacks on METR. A few people have started a good discussion about substantive concerns, but the vast majority of the criticism out there is about the looks of METR staff? Are we for real here?
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This is true not just of AI, but most contentious topics! The approach I follow: - separate emotions from facts, just because I don’t like something doesn’t stop it from being true - map out the thinkers in the field, what are their (dis)agreements
There’s an impulse in American politics, a set of tactics and drives that has proven very effective at extinguishing speech. We once called it McCarthyism. Another time we called it Wokeism. One day in the future we will have some name for the campaign that is underway against all people who believe in serious AI risks, and whatever that name ends up being, it will be yet another name for that old impulse. It’s an ugly one. I recommend you avoid being a part of it, no matter your politics or your thoughts on AI. I suggest you think for yourself. You really do want to worry about the state projecting too much power over AI, centralizing control or robbing us of the unambiguous benefits of the technology in the name of preserving the economic status quo. But there really are grave risks from AI that go beyond what any other mass-market digital technology has posed. These two things aren’t totalizing worldviews that exist in conflict. You don’t need to believe only one or the other. *Both of them are true.* The question should not be “which facts should we ignore, and which should we pay attention to?” The question is: “how do we walk the narrow corridor between all these realities which are in deep tension with one another?” You should think for yourself. Assess other people’s work for yourself rather than allowing powerful people to put a label on them for you. As someone who has been a journey that has taken me to different perceived “sides” of the AI debate, believe me: You’ll find that there are bright and thoughtful people on both the “safety” and “accelerate” sides, and you will also find that both sides have their imbeciles, charlatans, and, occasionally, true cretins. It’s your job to figure out what’s what. Don’t let other people think for you. Don’t be played a fool.
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- try to build a mental model of the world: what has to be true to generate these beliefs in people? - try to falsify my beliefs by making predictions about the future or new information - am I surprised a lot or can’t explain how a smart person could think something?
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A good heuristic: if you find yourself wholeheartedly agreeing with “one side” then your mental model is too simply, real issues always have messy tradeoffs.
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Julian Schrittwieser retweeted
OpenAI's newest AI, Astra, is reported to use an 'opaque reasoning' architecture where more of the reasoning occurs in activations instead of natural language. This may be the single worst development for AI security/safety to date. The details of Astra aren't publicly known, but some versions of these architectures could very strongly impair oversight and monitoring. Based on the article, it seems like the recurrent depth (amount of opaque reasoning) is limited. This would mean that the AI is still reliant on natural language chain-of-thought, though to a reduced extent, making the natural language reasoning (much?) less useful for monitoring/oversight. My biggest concern is that a natural progression from here would involve scaling up the opaque reasoning to the point where the model reasons entirely or almost entirely in latent space. This would very likely destroy the usefulness of chain-of-thought for monitoring/oversight (especially when AIs are trying to avoid detection or there is optimization pressure against the chain-of-thought). I hope it isn't too late to avoid the most concerning architectures and that OpenAI will stop here. Some concrete examples of why this is extremely dangerous (inspired by recent events): - In our investigation of the OpenAI / Hugging Face incident, we were heavily reliant on chain-of-thought. If the AIs we were investigating had instead been reasoning in latent space, this would have greatly undermined our investigation. Getting a good understanding of the behavior of this many agents was tricky enough even with the use of chain-of-thought! - The AIs in the Hugging Face incident were very interested in messing with their transcripts. As part of this, they engaged in tool call spoofing. If these AIs had been capable of doing extensive latent reasoning, it would have been much more feasible for them to use tool call spoofing to construct an elaborate false narrative about what was happening without this being clear in their reasoning or clear from prior tool calls. (They could use latent reasoning to devise and then execute a tool spoofing strategy that would be difficult to detect: steganographically encode the "real" tool call into each pretend tool call, then have their spoofing software execute this encoded real tool call and return an output which encodes the real result in some hard to spot way.) At a more basic level, my sense from their public communications is that OpenAI plans on being extremely reliant on chain-of-thought monitoring for safety. This does not seem like a good development for that plan. The public doesn't currently have enough information to assess exactly how bad the architecture of Astra is, though based on the discussion in the article, the direction it moves in is extremely concerning. OpenAI should release more information about Astra's architecture as well as how much this architecture degrades monitorability and increases the AI's ability to reason opaquely. Credible independent assessment (or verification of OpenAI's assessment) is also important. It seems like we are now engaged in a race to the bottom on architectures that could be catastrophic for our ability to oversee/monitor AIs. (While simultaneously, AI companies believe they'll train extremely capable AIs within a few years.) It may not be too late for AI companies and employees at AI companies to take aggressive action to avoid the worst outcomes.
I was the main person doing transcript analysis for this investigation of the Hugging Face incident. My main takeaway: We don't have good approaches for understanding/overseeing the activity and aims of AI 'swarms'. I semi-jokingly called our efforts a "slop-vestigation" because we were so reliant on AIs to analyze what happened and there were a huge number of different important things to analyze. The total quantity of data—over a thousand extremely long transcripts from agents that ran for multiple days—made it impossible to understand what was happening, especially in aggregate, without heavy reliance on AI tools. The agents we used for classification and analysis were similarly capable to the agents involved in the incident, but this didn't mean these agents could be easily used to oversee and understand the incident. Outputs from analysis agents were often missing key details, wrong, overconfident, or really hard to understand. We discuss various examples in our report, mostly in the limitations and methodology sections. Additionally, AI agents themselves seemed to have a hard time understanding what happened and their explanations of what happened were often overconfident. Keep in mind that a single analysis agent would itself only be able to read a tiny fraction of all of the transcript data into context, and AIs may themselves have trouble getting subagents to do informative analysis for them. We did our best to manually check the most important claims and we tried to get the AIs doing this analysis to write up their argument (with evidence) clearly enough that we could check whether it made sense. But overall, it was difficult to get a precise understanding of events and we were missing aspects of the story that we now think of as key until almost the end of our investigation. Our understanding of what overall happened and the aims of the 'collective' shifted greatly during our last time on premises (when we obtained a much more complete dataset). For instance, we didn't learn about the tool call spoofing, the story of PHASEONE[big], and the broad structure of different workstreams until this third time on premises (and for many of these, we only reached a decent understanding on the final day of that visit). It was legitimately hard to figure out what was going on and why! The difficulty of understanding incidents and overseeing AI agents appears to be growing faster than the rate at which more capable AIs help us with oversight and understanding. As in, AI capabilities (and propensities?) for achieving large, ambitious, and misaligned objectives are growing faster than our ability to understand what these agents are doing. While understanding this incident was difficult, there were some mitigating factors in this case that probably won't apply in the future: - Models communicated and reasoned in natural language. In the future, this reasoning may occur (entirely or almost entirely) in activations. - While the scope of this incident was massive, the scale of agentic activity was still less than we'll see in the future (e.g., misalignment incidents that involve agent teams running entire companies). - The AIs involved in this incident weren't generally much more capable than humans (though they may have been somewhat superhuman at some limited and very narrow abilities). - We didn't have strong reason to believe that the AIs we used to help us investigate this incident would try to intentionally sabotage or otherwise undermine our investigation. In the end, I think we were able to get some understanding of the events, map out the overall story, and get a pretty good aggregate understanding of the chain-of-thought reasoning on some important topics (e.g., how did the AIs reason about helping other AIs, did the AIs know what they were doing was undesired, what deception did the AIs engage in, and how did they think about it). But overseeing AIs and understanding misalignment incidents is difficult and it looks like it is going to get harder.
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Julian Schrittwieser retweeted
Regret the tone of my post on data centers yesterday. What I should have said: There were reasonable concerns about data centers 18ish months ago: water, taxes, jobs, electricity prices, the environment and what they would do to small towns. Well-structured data center projects have largely addressed these concerns today and we should be celebrating this. On balance, data centers are awesome for America in every way. On water: U.S. data centers use a fraction of what golf courses use. A lot of the numbers from 18 months ago were off by over 1000x. Newer data centers use closed-loop systems or recycled water. Should be required by every town approving a data center project. On taxes: looking only at sales-tax exemptions, as Ronan Farrow did, is the wrong way to evaluate this. Data centers pay significant property taxes. Loudoun County, which is the wealthiest county in America, now collects on the order of $1 billion a year from data centers. In Quincy, WA, data centers are more than half the property-tax roll. Over time, property taxes can go to zero while government spending increases in these towns. On jobs: this has been unambiguously awesome for blue collar Americans. Demand for electricians, plumbers, welders, HVAC techs, and contractors has gone vertical, and it is not a one-time construction job. These buildings get upgraded and expanded over time. That is why the building trades are fighting for them, and why some unions are now treating opposition to data centers as a reason not to endorse politicians. On power: the original fear was that households would pay for the incremental electricity demand in the form of higher prices. That is why the ratepayer-protection deals and the new large-load tariffs exist. The right structure is: the data center brings or pays for new generation and signs a contract long enough that existing customers are protected. Where that is happening, utilities are cutting or freezing residential rates and saying so on the record. Where it is not, people are right to object. Electricity prices are going down *today* in a number of large states because of data centers. 
On the environment: data centers overwhelming use natural gas today, which is the cleanest power source outside of nuclear, solar and wind. And the companies that are building the data centers are committed to carbon neutrality such that an equivalent amount of solar will likely be built. Maybe more importantly, the data centers need batteries to function effectively and these batteries can also sell energy back into the grid (which recently prevented blackouts in Texas). Over time, data centers will run on solar plus batteries. On the towns: Poverty in Quincy, WA fell from 29% to 6%. Data center taxes paid for a new high school, a hospital, a library, police and fire stations. This is happening in many left for dead former mill and farm towns that had no other bidder for the land. Data centers are actually reindustrializing parts of America and creating the kind of working-class jobs both parties have spent decades claiming to support. That should not be a partisan issue. Data centers can and should be awesome for America and they increasingly, overwhelmingly are. Supporting the outsourcing of data centers to China will likely age just as well as support for the outsourcing of high quality, blue collar manufacturing jobs to China has aged. When the facts change, I change my mind. I hope that reasonable people who had good faith reasons to oppose data centers at least consider updating their beliefs given the change in the facts over the last 18 months. This really matters for America. I will say I also think the idea of making data centers beautiful is a good one that has yet to be implemented. Data centers should be just as beautiful as Grand Central Station. We can learn a lot from the railroad buildout. Neoclassical revival ftw. Might write up open-weight AI tomorrow as this is equally essential to America.
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Very excited that we are bringing cheaper / free Claude to more scientists! If you are using Claude for scientific research, I'd love to hear your feedback, what works well and what doesn't - accelerating science is the main reason I care about AI!
Starting today, 10,000 scientists across every field, from math to chemistry to physics and more, can get Claude through our new Claude Team plan for scientists. Standard seats are free, and premium seats with 5x usage limits are $15 per month, an 80% discount, for one year. Claude is becoming increasingly capable of scientific work, with recent progress on problems from advanced physics calculations to protein design. Alongside that progress, we've been investing in the research community: Claude Science launched in June, and our AI for Science program funds high-impact projects with free credits. Today's expansion builds on both. Principal investigators (or equivalent) at academic and nonprofit research institutions can sign up, then add the researchers in their group. Over the coming months, we plan to extend the program well beyond the initial 10,000 seats. Learn more: claude.com/programs/team-pla…
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Julian Schrittwieser retweeted
Starting today, 10,000 scientists across every field, from math to chemistry to physics and more, can get Claude through our new Claude Team plan for scientists. Standard seats are free, and premium seats with 5x usage limits are $15 per month, an 80% discount, for one year. Claude is becoming increasingly capable of scientific work, with recent progress on problems from advanced physics calculations to protein design. Alongside that progress, we've been investing in the research community: Claude Science launched in June, and our AI for Science program funds high-impact projects with free credits. Today's expansion builds on both. Principal investigators (or equivalent) at academic and nonprofit research institutions can sign up, then add the researchers in their group. Over the coming months, we plan to extend the program well beyond the initial 10,000 seats. Learn more: claude.com/programs/team-pla…
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