
interp @AnthropicAI, phd @stanfordnlp
SF
Joined December 2018
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Aryaman Arora retweeted
inspired by @nickcammarata 's Neural Networks are Already Clean + @treetowntree and @_a9lim , we tried using the lens on neurons…
it worked! many chain lens readouts roundtrip and describe neuron steering behavior well. this cost $5 for all 1.1M MLP neurons in Qwen 27B
🐐
Excited to release a new draft handbook chapter on Language Models and Experimental Syntax!
We review the last ~10 years of work using experimental syntax methods (minimal pairs, acceptability judgments, priming) to ask if LMs can do syntax
w/@qyao23,@kanishkamisra & @kmahowald
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Aryaman Arora retweeted
We recently went viral on X with the claim that neurons are "already clean." But what do we mean by that? Are neurons are a useful basis for interp? We're finally releasing our technical report on LLM neurons--and what we've found is far more interesting than mono/polysemanticity.xitter.twitterapi.xyz/GoodfireAI/status/2120…
In Neural Networks are Already Clean, @nickcammarata argued that neurons were far more legible than previously thought – and that this was great news for interpretability and safety.
Now, we’re releasing the first technical companion to Nick’s essay. It shares our findings from studying thousands of neurons using our novel automated interpretability pipeline, and outlines why we now think of neurons by their computational function, instead of whether or not they are polysemantic. Here’s what we found: 🧵
great model on a great benchmark 👀
Claude Fable 5.2 ranks #1 on FrontierSWE.
Fable 5.2 achieves a score of 69.9%, outperforming GPT-6 Astra (65.5%), Opus 5.5 (62.3%) and Gemini 4 Carbon (61.2%)
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Aryaman Arora retweeted
spending time in taiwan has convinced me of “Asia” as a distinct cultural unit
the people, scenes, and smells here (even in tech hub cities like Hsinchu) remind me more of my childhood trips to India than anything else
Aryaman Arora retweeted
Replying to @thebasepoint
This one but we're about to drop a new version with some stuff added for ICLR, like more models and random seed experiments that control for non-geometric explanations. (And we're doing followup to expand outside of these three settings.) arxiv.org/abs/2606.13934
Aryaman Arora retweeted
I'm Sam, one of Anthropic's co-founders, and I lead much of our safety work. I'm going to have more to share on that work over the coming months.
I thought I'd start by sharing a few thoughts on the latest report from @METR_Evals.
The speed of progress in model capabilities is one of the most important questions in AI safety, and METR’s work here provides the public with an independent, external view into how this is happening inside Anthropic. I’ll talk more about some of the details below, but first some context for those new to this work.
How quickly AI progress is accelerating has many important safety implications, since it determines how quickly the risks from advanced models increase. But, because most research happens within the frontier labs, it’s difficult for external observers and policy makers to get a strong sense of what that rate is. We kicked off the process with METR that led to this report earlier in the year, in anticipation of progress continuing to accelerate.
For this report, we gave METR access to a range of sensitive internal data, including benchmark scores for unreleased models, estimates of how models are progressing, and interviews with our researchers. They had complete independence to form their own conclusions.
Many of their conclusions match my own. AI is speeding up our research, but it’s hard to say exactly how much. While they conclude AI can't yet make the most important contributions to model training on its own, they think the pace of development could, by default, accelerate further.
This work began well before and is separate from the embedded third-party evaluators that are part of our commitment to pacing the frontier, but it’s a good illustration of why we think evaluators are a good idea. The more access reviewers have, the clearer a picture they can form of the situation and the better-positioned they are to highlight situations like this one.
We redacted a lot, and I accept that this makes it harder for others to check METR’s work. But we determined that sharing exactly what is driving the speedup isn’t the right thing to do, both because it’s commercially sensitive and because it risks handing out a roadmap for others to go faster. That would make the risks METR is worried about worse. That’s a tradeoff. I think we made the right call, though we’re continuing to assess the pros and cons here.
In the coming weeks, we plan to share a report with our own analysis of the speed of AI progress within Anthropic, including where we stand against our Responsible Scaling Policy, plus new steps we’re taking to strengthen our safety and security practices as AI keeps improving quickly.
Aryaman Arora retweeted
Put a heart ❤️ next to a coding problem, and Claude & GPT write recursive code 100% of the time (0% baseline). They also can't tell you why!
Excited to share “A Heart Means Recursion” from my summer at @GoogleDeepMind, on how VLMs read & communicate with visual symbols. 🧵
@ interpretability researchers
We asked GPT-6 Astra to edit Qwen3.5-0.8B weights to improve math.
It directly changed only 0.016% of weights, fixing 0.8B's reasoning loops & improving math up to 6x and even instruction following 3x, without gradients or training.
We call this Weight-Space Programming: frontier LLMs can now natively read/write neural network weights! 🧵
Blog: rikiyat.github.io/blog/weigh…
Readers added context they thought people might want to know
LLM was given weights explicitly as text in prompt and used code/forward passes (per authors' logs) to ablate Qwen looping direction, a known thinking-mode issue per model card. Primarily fixed repetition in that mode, not general 'natively' improving weights/math.
rikiyat.github.io/blog/weight-sp…
github.com/RikiyaT/lm_und…
huggingface.co/Qwen/Qwen3.5-0…
huggingface.co/RikiyaT/Qwen3.…
here’s some recent work by @GeorgeMorgulis @johnhewtt and @NathanHu12 on mechanistically understanding generalisation under subliminal learning, which i’ve quite enjoyed reading!
- arxiv.org/abs/2609.16927
- arxiv.org/abs/2604.25783
Mechanistic interpretability was a huge missed opportunity. Many people wanted to join that effort, assuming it meant a mechanistic understanding of generalization. Instead, it was a bait and switch into an extremely niche, esoteric, and largely ill-conceived effort around understanding the roles of individual neurons. This has often been a challenge in alignment and interpretability: compelling initiatives that ought to be broadly defined, or at least mean what we would expect they mean, end up being restricted to a very narrow and esoteric set of topics. For example, if someone says they work on “interpretability” it does not mean what one would naively assume, e.g., interpretable methods, algorithms, representations, or model deconstruction, understanding the data, etc., but rather sparse autoencoders, influence functions, saliency maps. What a waste!
✅ Zhengxuan Wu (@ZhengxuanZenWu) has joined Meta.
DINQ每日人才转会报道!
吴政璇(@ZhengxuanZenWu)从 Google DeepMind 加入 Meta TBD,X 简介已更新为“safety @Meta tbd”。
斯坦福计算机博士,ReFT 共同一作、pyvene 第一作者。从模型内部干预到 Agent 安全评测,他的研究关注如何理解并控制模型行为。
Aryaman Arora retweeted
PhDone!
Very grateful to all my committee members!
@Diyi_Yang @zsoltkira @kartik_goyal_ @PoloChau @sanmikoyejo
Aryaman Arora retweeted
worth noting with the recent "persona neurons" trend: just because a steering intervention induces a persona change, doesn't mean the vector or neuron being steered is persona-specific. models seem to do something like "persona solving" under steering
vgel.me/slime_talk.pdf
Replying to @janbamjan @zetalyrae
yeah, you also see this "absorption into the self" with general concept steering vectors, when you turn them up strong enough
i doubt most of these "persona neurons" people are finding are really persona-specific
no way, the average journalist is not even remotely equipped to evaluate scientific claims, and that’s why we have a duty to be careful about things we claim as scientists 😮
Aryaman Arora retweeted
🟦 Vision transformers emergently learn to segment objects, but how? 100 years ago, Gestalt psychologists had the same question about people. In new work with @Mikey_Lepori, we take inspiration from Gestalt psychology to study how ViTs bind image patches into objects.
Aryaman Arora retweeted
an interpretability "encyclopedia"? for accelerating interp research? 🤯
btw 7M+ neurons for qwen3-32B, gemma 4 31B, and llama 3.3 70B are now on neuronpedia:
neuronpedia.org/qwen3-32b/55…
neuronpedia.org/gemma-4-31b-…
neuronpedia.org/llama3.3-70b…
Aryaman Arora retweeted
New blog: separating forms from estimators, or, why steer by difference of means?
Interp often conflates the form (steering, neuron analysis) with the estimator (diff, SGD on log-loss.) When you can learn by gradient descent, you usually just should.
cs.columbia.edu/~johnhew/for…
Aryaman Arora retweeted
I had tons of fun working on pretraining (& automating the pretraining) of Flint! It's a really good local model and a small preview of what we are cooking!
Introducing Flint, @Recursive_SI’s first model: a fast local coding model built with our automated research system, the Eureka Machine.
• Best-in-class fast local coding
• Up to 2x faster than comparable models: 125+ tokens/sec on a MacBook Pro, 150+ on RTX Spark
• Built from scratch in under 4 months
Private, unmetered intelligence on your own machine. Open weights available now on @huggingface, run it locally on your favorite framework or try it for free on @opencode or @pidotdev.








































