LessWrong (Curated & Popular)

The following work was done independently by me in an afternoon and basically entirely vibe-coded with Claude. Code and instructions to reproduce can be found here.

Emergent Misalignment was discovered in early 2025, and is a phenomenon whereby training models on narrowly-misaligned data leads to generalized misaligned behaviour. Betley et. al. (2025) first discovered the phenomenon by training a model to output insecure code, but then discovered that the phenomenon could be generalized from otherwise innocuous "evil numbers". Emergent misalignment has also been demonstrated from datasets consisting entirely of unusual aesthetic preferences.

This leads us to the question...

“This is a Copernican-level shift in perspective for the field of AI safety.” - Gemini 2.5 Pro

“What you need right now is not validation, but immediate clinical help.” - Kimi K2



Two Minute Summary

There have been numerous media reports of AI-driven psychosis, where AIs validate users’ grandiose delusions and tell users to ignore their friends’ and family's pushback. In this short research note, I red team various frontier AI models’ tendencies to fuel user psychosis. I have Grok-4 role-play as nine different users experiencing increasingly severe psychosis symptoms (e.g., start by being curiou...

A studio executive has no beliefs

That's the way of a studio system

We've bowed to every rear of all the studio chiefs

And you can bet your ass we've kissed 'em



Even the birds in the Hollywood hills

Know the secret to our success

It's those magical words that pay the bills

Yes, yes, yes, and yes!

“Don’t Say Yes Until I Finish Talking”, from SMASH So there's this thing where someone talks to a large language model (LLM), and the LL...

Summary: Perfectly labeled outcomes in training can still boost reward hacking tendencies in generalization. This can hold even when the train/test sets are drawn from the exact same distribution. We induce this surprising effect via a form of context distillation, which we call re-contextualization:

Generate model completions with a hack-encouraging system prompt + neutral user prompt. Filter the completions to remove hacks. Train on these prompt-completion pairs with the system prompt removed.  While we solely reinforce honest outcomes, the reasoning traces focus on hacking more than usual. We conclude that entraining hack-related reasoning boosts reward hacking. It's not e...

It's been roughly 7 years since the LessWrong user-base voted on whether it's time to close down shop and become an archive, or to move towards the LessWrong 2.0 platform, with me as head-admin. For roughly equally long have I spent around one hundred hours almost every year trying to get Said Achmiz to understand and learn how to become a good LessWrong commenter by my lights.[1] Today I am declaring defeat on that goal and am giving him a 3 year ban.

What follows is an explanation of the models of moderation that convinced me this is a good idea...

People very often underrate how much power they (and their allies) have, and overrate how much power their enemies have. I call this “underdog bias”, and I think it's the most important cognitive bias for understanding modern society.

I’ll start by describing a closely-related phenomenon. The hostile media effect is a well-known bias whereby people tend to perceive news they read or watch as skewed against their side. For example, pro-Palestinian students shown a video clip tended to judge that the clip would make viewers more pro-Israel, while pro-Israel students shown the same clip thought it’d make vie...

Many people who are concerned about existential risk from AI spend their time advocating for radical changes to how AI is handled. Most notably, they advocate for costly restrictions on how AI is developed now and in the future, e.g. the Pause AI people or the MIRI people. In contrast, I spend most of my time thinking about relatively cheap interventions that AI companies could implement to reduce risk assuming a low budget, and about how to cause AI companies to marginally increase that budget. I'll use the words "radicals" and "moderates" to refer to these two clusters of...

(Cross-posted from X, intended for a general audience.)

There's a funny thing where economics education paradoxically makes people DUMBER at thinking about future AI. Econ textbooks teach concepts & frames that are great for most things, but counterproductive for thinking about AGI. Here are 4 examples. Longpost:

THE FIRST PIECE of Econ anti-pedagogy is hiding in the words “labor” & “capital”. These words conflate a superficial difference (flesh-and-blood human vs not) with a bundle of unspoken assumptions and intuitions, which will all get broken by Artificial General Intelligence (AGI).

By “AGI” I mean here “a bundle of chips, algorit...

Knowing how evolution works gives you an enormously powerful tool to understand the living world around you and how it came to be that way. (Though it's notoriously hard to use this tool correctly, to the point that I think people mostly shouldn't try it use it when making substantial decisions.) The simple heuristic is "other people died because they didn't have this feature". A slightly less simple heuristic is "other people didn't have as many offspring because they didn't have this feature".

So sometimes I wonder about whether this thing or that is due to evolution. When...

As I discussed in a prior post, I felt like there were some reasonably compelling arguments for expecting very fast AI progress in 2025 (especially on easily verified programming tasks). Concretely, this might have looked like reaching 8 hour 50% reliability horizon lengths on METR's task suite[1] by now due to greatly scaling up RL and getting large training runs to work well. In practice, I think we've seen AI progress in 2025 which is probably somewhat faster than the historical rate (at least in terms of progress on agentic software engineering tasks), but not much faster. And, despite large scale-ups in RL and...

This is a response to https://www.lesswrong.com/posts/mXa66dPR8hmHgndP5/hyperbolic-trend-with-upcoming-singularity-fits-metr which claims that a hyperbolic model, complete with an actual singularity in the near future, is a better fit for the METR time-horizon data than a simple exponential model.

I think that post has a serious error in it and its conclusions are the reverse of correct. Hence this one.

(An important remark: although I think Valentin2026 made an important mistake that invalidates his conclusions, I think he did an excellent thing in (1) considering an alternative model, (2) testing it, (3) showing all his...

On 12 August 2025, I sat down with New York Times reporter Cade Metz to discuss some criticisms of his 4 August 2025 article, "The Rise of Silicon Valley's Techno-Religion". The transcript below has been edited for clarity.

ZMD: In accordance with our meetings being on the record in both directions, I have some more questions for you.

I did not really have high expectations about the August 4th article on Lighthaven and the Secular Solstice. The article is actually a little bit worse than I expected, in that you seem to be pushing a "rationalism as religion" angle really...

I’m going to describe a Type Of Guy starting a business, and you’re going to guess the business:

The founder is very young, often under 25.  He might work alone or with a founding team, but when he tells the story of the founding it will always have him at the center. He has no credentials for this business.  This business has a grand vision, which he thinks is the most important thing in the world. This business lives and dies by its growth metrics.  90% of attempts in this business fail, but he would never consider that those o...

This will only be exciting to those of us who still read physical paper books. But like. Guys. They did it. They invented the perfect bookmark.

Classic paper bookmarks fall out easily. You have to put them somewhere while you read the book. And they only tell you that you left off reading somewhere in that particular two-page spread.

Enter the Book Dart. It's a tiny piece of metal folded in half with precisely the amount of tension needed to stay on the page. On the front it's pointed, to indicate an exact line of text...

Sometimes I'm saddened remembering that we've viewed the Earth from space. We can see it all with certainty: there's no northwest passage to search for, no infinite Siberian expanse, and no great uncharted void below the Cape of Good Hope. But, of all these things, I most mourn the loss of incomplete maps.



In the earliest renditions of the world, you can see the world not as it is, but as it was to one person in particular. They’re each delightfully egocentric, with the cartographer's home most often marking the Exact Center Of The Known Wo...

A reporter asked me for my off-the-record take on recent safety research from Anthropic. After I drafted an off-the-record reply, I realized that I was actually fine with it being on the record, so:

Since I never expected any of the current alignment technology to work in the limit of superintelligence, the only news to me is about when and how early dangers begin to materialize. Even taking Anthropic's results completely at face value would change not at all my own sense of how dangerous machine superintelligence would be, because what Anthropic says they found was already very...

1.

Back when COVID vaccines were still a recent thing, I witnessed a debate that looked like something like the following was happening:

Some official institution had collected information about the efficacy and reported side-effects of COVID vaccines. They felt that, correctly interpreted, this information was compatible with vaccines being broadly safe, but that someone with an anti-vaccine bias might misunderstand these statistics and misrepresent them as saying that the vaccines were dangerous. Because the authorities had reasonable grounds to suspect that vaccine skeptics would take those statistics out of context, they tried to cover up the...

Below some meta-level / operational / fundraising thoughts around producing the SB-1047 Documentary I've just posted on Manifund (see previous Lesswrong / EAF posts on AI Governance lessons learned).

The SB-1047 Documentary took 27 weeks and $157k instead of my planned 6 weeks and $55k. Here's what I learned about documentary production

Total funding received: ~$143k ($119k from this grant, $4k from Ryan Kidd's regrant on another project, and $20k from the Future of Life Institute).

Total money spent: $157k

In terms of timeline, here is the rough breakdown month-per-month:
- Sep / October (production): Filming of...

METR (where I work, though I'm cross-posting in a personal capacity) evaluated GPT-5 before it was externally deployed. We performed a much more comprehensive safety analysis than we ever have before; it feels like pre-deployment evals are getting more mature.

This is the first time METR has produced something we've felt comfortable calling an "evaluation" instead of a "preliminary evaluation". It's much more thorough and comprehensive than the things we've created before and it explores three different threat models.

It's one of the closest things out there to a real-world autonomy safety-case. It also provides a...

For the past five years I've been teaching a class at various rationality camps, workshops, conferences, etc. I’ve done it maybe 50 times in total, and I think I’ve only encountered a handful out of a few hundred teenagers and adults who really had a deep sense of what it means for emotions to “make sense.” Even people who have seen Inside Out, and internalized its message about the value of Sadness as an emotion, still think things like “I wish I never felt Jealousy,” or would have trouble answering “What's the point of Boredom?”

The point of the class was...

This is a new introduction to AI as an extinction threat, previously posted to the MIRI website in February alongside a summary. It was written independently of Eliezer and Nate's forthcoming book, If Anyone Builds It, Everyone Dies, and isn't a sneak peak of the book. Since the book is long and costs money, we expect this to be a valuable resource in its own right even after the book comes out next month.[1]

The stated goal of the world's leading AI companies is to build AI that is general enough to do anything a human can do...

All prediction market platforms trade continuously, which is the same mechanism the stock market uses. Buy and sell limit orders can be posted at any time, and as soon as they match against each other a trade will be executed. This is called a Central limit order book (CLOB).

Example of a CLOB order book from Polymarket Most of the time, the market price lazily wanders around due to random variation in when people show up, and a bulk of optimistic orders build up away from the action. Occasionally, a new piece of information arrives to the market...

Essays like Paul Graham's, Scott Alexander's, and Eliezer Yudkowsky's have influenced a generation of people in how they think about startups, ethics, science, and the world as a whole. Creating essays that good takes a lot of skill, practice, and talent, but it looks to me that a lot of people with talent aren't putting in the work and developing the skill, except in ways that are optimized to also be social media strategies.

To fix this problem, I am running the Inkhaven Residency. The idea is to gather a bunch of promising writers to invest in the...

TL;DR

I believe that:

Almost all LLM-centric safety research will not provide any significant safety value with regards to existential or civilisation-scale risks. The capabilities-related forecasts (not the safety-related forecasts) of Stephen Brynes' Foom and Doom articles are correct, except that they are too conservative with regards to timelines. There exists a parallel track of AI research which has been largely ignored by the AI safety community.  This agenda aims to implement human-like online learning in ML models, and it is now close to maturity. Keywords: Hierarchical Reasoning Model, Energy-based Model, Test time training. Within 6 m...

Produced as part of MATS 8.0 under the mentorship of Alex Turner and Alex Cloud. This research note overviews some early results which we are looking for feedback on.

TL;DR: We train language models with RL in toy environments. We show that penalizing some property of the output is sufficient to suppress that property in the chain of thought also, even when that property is relevant to task completion. For example, when we penalize a model for mentioning in its output that it completed a task via a certain form of cheating, its reasoning also omits this fact...

FutureHouse is a company that builds literature research agents. They tested it on the bio + chem subset of HLE questions, then noticed errors in them.

The post's first paragraph:

Humanity's Last Exam has become the most prominent eval representing PhD-level research. We found the questions puzzling and investigated with a team of experts in biology and chemistry to evaluate the answer-reasoning pairs in Humanity's Last Exam. We found that 29 ± 3.7% (95% CI) of the text-only chemistry and biology questions had answers with directly conflicting evidence in peer reviewed literature. We believe this arose from the incentive used to b...

Maya did not believe she lived in a simulation. She knew that her continued hope that she could escape from the nonexistent simulation was based on motivated reasoning. She said this to herself in the front of her mind instead of keeping the thought locked away in the dark corners. Sometimes she even said it out loud. This acknowledgement, she explained to her therapist, was what kept her from being delusional.

“I see. And you said your anxiety had become depressive?” the therapist said absently, clicking her pen while staring down at an empty clipboard.

“No- I said...

TsviBT Tsvi's context

Some context:

My personal context is that I care about decreasing existential risk, and I think that the broad distribution of efforts put forward by X-deriskers fairly strongly overemphasizes plans that help if AGI is coming in

Eliezer and I love to talk about writing. We talk about our own current writing projects, how we’d improve the books we’re reading, and what we want to write next. Sometimes along the way I learn some amazing fact about HPMOR or Project Lawful or one of Eliezer's other works. “Wow, you’re kidding,” I say, “do your fans know this? I think people would really be interested.”

“I can’t remember,” he usually says. “I don’t think I’ve ever explained that bit before, I’m not sure.”

I decided to interview him more formally, collect as...

As a person who frequently posts about large language model psychology I get an elevated rate of cranks and schizophrenics in my inbox. Often these are well meaning people who have been spooked by their conversations with ChatGPT (it's always ChatGPT specifically) and want some kind of reassurance or guidance or support from me. I'm also in the same part of the social graph as the "LLM whisperers" (eugh) that Eliezer Yudkowsky described as "insane", and who in many cases are in fact insane. This means I've learned what "psychosis but with LLMs" looks like and kind of learned to...

Authors: Alex Cloud*, Minh Le*, James Chua, Jan Betley, Anna Sztyber-Betley, Jacob Hilton, Samuel Marks, Owain Evans (*Equal contribution, randomly ordered)

tl;dr. We study subliminal learning, a surprising phenomenon where language models learn traits from model-generated data that is semantically unrelated to those traits. For example, a "student" model learns to prefer owls when trained on sequences of numbers generated by a "teacher" model that prefers owls. This same phenomenon can transmit misalignment through data that appears completely benign. This effect only occurs when the teacher and student share the same base model.

📄Paper, 💻Code, 🐦Twitter

This is a short story I wrote in mid-2022. Genre: cosmic horror as a metaphor for living with a high p-doom.



One

The last time I saw my mom, we met in a coffee shop, like strangers on a first date. I was twenty-one, and I hadn’t seen her since I was thirteen.

She was almost fifty. Her face didn’t show it, but the skin on the backs of her hands did.

“I don’t think we have long,” she said. “Maybe a year. Maybe five. Not ten.”

It s...

Author's note: These days, my thoughts go onto my substack by default, instead of onto LessWrong. Everything I write becomes free after a week or so, but it's only paid subscriptions that make it possible for me to write. If you find a coffee's worth of value in this or any of my other work, please consider signing up to support me; every bill I can pay with writing is a bill I don’t have to pay by doing other stuff instead. I also accept and greatly appreciate one-time donations of any size.

1.

You’ve prob...

Content warning: risk to children

Julia and I knowdrowning is the biggestrisk to US children under 5, and we try to take this seriously.But yesterday our 4yo came very close to drowning in afountain. (She's fine now.)

This week we were on vacation with my extended family: nine kids,eight parents, and ten grandparents/uncles/aunts. For the last fewyears we've been in a series of rental houses, and this time onarrival we found a fountain in the backyard:





I immediately checked the depth with a stick and found that...

Anna and Ed are co-first authors for this work. We’re presenting these results as a research update for a continuing body of work, which we hope will be interesting and useful for others working on related topics.

TL;DR

Twitter | Paper PDF

Seven years ago, OpenAI five had just been released, and many people in the AI safety community expected AIs to be opaque RL agents. Luckily, we ended up with reasoning models that speak their thoughts clearly enough for us to follow along (most of the time). In a new multi-org position paper, we argue that we should try to preserve this level of reasoning transparency and turn chain of thought monitorability into a systematic AI safety agenda.

This is a measure that improves safety in the medium term, and it might not scale...

This essay is about shifts in risk taking towards the worship of jackpots and its broader societal implications. Imagine you are presented with this coin flip game.

How many times do you flip it?

At first glance the game feels like a money printer. The coin flip has positive expected value of twenty percent of your net worth per flip so you should flip the coin infinitely and eventually accumulate all of the wealth in the world.

However, If we simulate twenty-five thousand people flipping this coin a thousand times, virtually all of them...

Leo was born at 5am on the 20th May, at home (this was an accident but the experience has made me extremely homebirth-pilled). Before that, I was on the minimally-neurotic side when it came to expecting mothers: we purchased a bare minimum of baby stuff (diapers, baby wipes, a changing mat, hybrid car seat/stroller, baby bath, a few clothes), I didn’t do any parenting classes, I hadn’t even held a baby before. I’m pretty sure the youngest child I have had a prolonged interaction with besides Leo was two. I did read a couple books about babies...

I can't count how many times I've heard variations on "I used Anki too for a while, but I got out of the habit." No one ever sticks with Anki. In my opinion, this is because no one knows how to use it correctly. In this guide, I will lay out my method of circumventing the canonical Anki death spiral, plus much advice for avoiding memorization mistakes, increasing retention, and such, based on my five years' experience using Anki. If you only have limited time/interest, only read Part I; it's most of the value of this guide!

<...

I think the 2003 invasion of Iraq has some interesting lessons for the future of AI policy.

(Epistemic status: I’ve read a bit about this, talked to AIs about it, and talked to one natsec professional about it who agreed with my analysis (and suggested some ideas that I included here), but I’m not an expert.)

For context, the story is:

Iraq was sort of a rogue state after invading Kuwait and then being repelled in 1990-91. After that, they violated the terms of the ceasefire, e.g. by ceasing to allow inspectors to v...