Leon Lang @Lang__Leon
PhD student at the intersection of information theory and deep learning. Two master's degrees in maths and AI. Interested in AI existential safety linkedin.com/in/leon-lang/ University of Amsterdam Joined September 2013-
Tweets5K
-
Followers1K
-
Following553
-
Likes5K
I saw it live in Birmingham, phenomenal.
I saw it live in Birmingham, phenomenal.
108
203
2K
68K
87
Download Video
Leon Lang retweeted
AI automation is NOT just an economic issue! Labor doesn't just give you money, it also gives you power. When the world doesn't rely on people power anymore, the risk of oppression goes up. Right now, popular uprisings can and do regularly overthrow oppressive governments.…
Leon Lang retweeted
@MichaelTrazzi We're currently looking at a 38% chance that one of the hunger strikes convinces a Major AI lab to do anything.
This didn’t happen. How can one best penalise people for wasting the attention of hundreds of thousands of people like that?
This didn’t happen. How can one best penalise people for wasting the attention of hundreds of thousands of people like that?
Leon Lang retweeted
Just in: details of the Anthropic class action settlement filed for court approval. Anthropic agrees to $1.5 BILLION paid to the class members. "The largest publicly reported copyright recovery in history" !
Leon Lang retweeted
Few people are aware of how good Gemini Deep Think is. It's at the point where "Should I ask an expert to chew on this or Deep Think?" is often answered with Deep Think. GPT-5 Pro is more "intellectual yet idiot" while Deep Think has better taste. I've been repeating this a…
I don’t know what’s true here and what selection effects are involved, but it is interesting that almost all comments under this post are like “What do you mean, Claude *does* write 90% of the code now”
I don’t know what’s true here and what selection effects are involved, but it is interesting that almost all comments under this post are like “What do you mean, Claude *does* write 90% of the code now”
Leon Lang retweeted
@Dimillian @AnthropicAI haha literally saw these side by side
Leon Lang retweeted
A new letter from 47 academic researchers in support of @Scott_Wiener's SB 53 was covered this morning in Politico. It's great to see such strong support from across California for this important measure!
Leon Lang retweeted
It's interesting how studies on the negative effects of social media on mental health are mixed: some find an effect, some don't (or only find a very small effect). Some take this as proof that social media is actually fine for mental health. My hypothesis is different. I think…
Leon Lang retweeted
We estimate that Claude Opus 4.1 has a 50%-time-horizon of around 1 hr 45 min (95% confidence interval of 50 to 195 minutes) on our agentic multi-step software engineering tasks. This estimate is lower than the current highest time-horizon point estimate of around 2 hr 15 min.
Leon Lang retweeted
NEW: Anthropic will start training its AI models on user data, including new chat transcripts & coding sessions, unless users choose to opt out by 9/28 (it's a pop-up window that will give you the choice). It’s also extending its data retention to 5 years. theverge.com/anthropic/7675…
Leon Lang retweeted
Honored and humbled to be in @TIME's list of the TIME100 AI of 2025! time.com/collections/ti… #TIME100AI
Leon Lang retweeted
To all undergrads interested in learning about AI: be wary of taking “Intro to AI” as your first AI course. In many programs, the class you actually want first is “Intro to Machine Learning”. AI technology has exploded in the past 15 years thanks to deep neural networks. Yet at…
Leon Lang retweeted
The UK is hopelessly behind on electricity generation and desperately needs to build 20-30 clean, cheap nuclear reactors. But right now our safetyist regulatory system makes that impossible. 🧵 In fact the UK has some of the slowest nuclear approvals in the world, and, as a…
Leon Lang retweeted
I made a 1-page document on the case for AI x-risk. It's intended to inform, not to convince. It mostly links to other articles I've found myself sending people.
Leon Lang retweeted
It’s rare for competitors to collaborate. Yet that’s exactly what OpenAI and @AnthropicAI just did—by testing each other’s models with our respective internal safety and alignment evaluations. Today, we’re publishing the results. Frontier AI companies will inevitably compete on…
Rob Bensinger ⏹️ @robbensinger
12K Followers 386 Following Comms @MIRIBerkeley. RT = increased vague psychological association between myself and the tweet.
David Krueger @DavidSKrueger
18K Followers 4K Following AI professor. Deep Learning, AI alignment, ethics, policy, & safety. Formerly Cambridge, Mila, Oxford, DeepMind, ElementAI, UK AISI. AI is a really big deal.
Nathan 🔎 @NathanpmYoung
24K Followers 3K Following Geopolitics, prediction markets. If you think I'm wrong, community note me. Capital case tweets are literal, others less. I like most people when I meet them.
Stefan Schubert @StefanFSchubert
38K Followers 2K Following Effective Altruism and the Human Mind (with @LuciusCaviola) is available for free at: https://t.co/ozvdxlZiro
Taco Cohen @TacoCohen
27K Followers 3K Following Post-trainologer at FAIR. Into codegen, RL, equivariance, generative models. Spent time at Qualcomm, Scyfer (acquired), UvA, Deepmind, OpenAI.
davidad 🎇 @davidad
20K Followers 9K Following Programme Director @ARIA_research | accelerate mathematical modelling with AI and categorical systems theory » build safe transformative AI » cancel heat death
Tom Lieberum 🔸 @lieberum_t
1K Followers 196 Following Trying to reduce AGI x-risk by understanding NNs Interpretability RE @DeepMind BSc Physics from @RWTH 10% pledgee @ https://t.co/Vh2bvwhuwd
Gary Marcus @GaryMarcus
191K Followers 7K Following “In the aftermath of GPT-5’s launch … the views of critics like Marcus seem increasingly moderate.” —@newyorker
Rob Wiblin @robertwiblin
44K Followers 754 Following Host of the 80,000 Hours Podcast. Exploring the inviolate sphere of ideas one interview at a time: https://t.co/2YMw00bkIQ
Marius Hobbhahn @MariusHobbhahn
5K Followers 1K Following CEO at Apollo Research @apolloaievals prev. ML PhD with Philipp Hennig & AI forecasting @EpochAIResearch
Oliver Habryka @ohabryka
6K Followers 724 Following Building https://t.co/O5mQY6jndL and https://t.co/s49h898W4b. Join our writing residency at https://t.co/7HQag8pNUk!
Miles Brundage @Miles_Brundage
62K Followers 12K Following AI policy researcher, wife guy in training, fan of cute animals and sci-fi, Substack writer, stealth-ish non-profit co-founder
Lauro @laurolangosco
1K Followers 701 Following European Commission (AI Office). PhD student @CambridgeMLG. Here to discuss ideas and have fun. Posts are my personal opinions; I don't speak for my employer.
Sara Magliacane (she/... @saramagliacane
3K Followers 2K Following Assistant prof @AmlabUvA Amsterdam | ELLIS scholar | #causality #causalML anything #causal | 🇮🇹🇸🇮 in 🇳🇱 | #UAI2025 program chair | @smaglia.bsky.social
Consistently Candid A... @FellowHominid
1K Followers 498 Following Just because you're paranoid doesn't mean they're not after you
Ben Hayum @BenHayum
5K Followers 764 Following ai policy intern @americans4ri, cs phd student @uwmadison, founder @aisafetyuw
Rianne van den Berg @vdbergrianne
8K Followers 2K Following Principal research manager at Microsoft Research Amsterdam. Formerly at Google Brain and University of Amsterdam. PhD in condensed matter physics.
Andreas Kirsch 🇺�... @BlackHC
14K Followers 6K Following My opinions only here. 👨🔬 RS @DeepMind, @Midjourney 1y 🧑🎓 DPhil @AIMS_oxford @UniofOxford 4.5y 🧙♂️ RE DeepMind 1y 📺 SWE @Google 3y 🎓 TUM 👤 @nwspk
ASI 4 President 2028 @thePartyPartyUS
700 Followers 520 Following What is The Party Party?: https://t.co/yZLScpHgyu ASI 4 Everyone, by Everyone, is the only way to secure a future with Everyone.
Blaxkboymeetsworld @Blaxkboymeetsw1
4 Followers 14 Following
from the Twilight Zon... @DIPLOMACYnWAR
444 Followers 1K Following multidimensional insights into Geopolitics
Eldbury @LEldbury
174 Followers 751 Following I like longevity, AI, brain computer interfaces and watching the approaching singularity.
Chelsea @gotarheelsunc
556 Followers 2K Following
Tori Bamberg @ToriBamberg
138 Followers 2K Following
Tommaso Castellani @tommmcaste
36 Followers 816 Following
Dingus @WildSynapse
270 Followers 4K Following Blending perspectives - distilling Truth | Fun troll.🧌
World News @global13news
369 Followers 328 Following Champion of truth in a world of noise. 🌍 Follow for clarity in chaos. 🌟Tweets not actionable🤡
Andy Bryant @AndyJBryant
2K Followers 117 Following Chief Strategy Officer @horizenlabs. Building businesses out of zero-knowledge (ZK) cryptography and AI.
William Taborda @willgeneva
116 Followers 875 Following
Dan Arroche @dan_arroche
276 Followers 410 Following ⚖️ | tech & crypto lawyer @dna_partners | 🎙️ podcast @Kontretemps 🔗 | IG : dan.arroche
Mariela @MarielaCidDeEc
458 Followers 4K Following
HK @HakimHarrow
6 Followers 302 Following
pam berkeley @pmberkeley
1K Followers 3K Following Engineer, educator, entrepreneur. Cares more about how people treat people than what they claim is their ideology.
CJ @i4gaau
634 Followers 982 Following Cybersecurity Enthusiast | Intrusion Detection Developer | Student & Researcher | Sharing Threat Intel, Tools & Insights
XY @XY2271590059235
2 Followers 35 Following
Adam Christopher @futureisasi
5 Followers 390 Following
The PhD Place @ThePhDPlace
118K Followers 16K Following Community, guidance & tips for academics 🎓 Practical resources, including AI | Courses at @AcademicCourses | Led by The PhD Place Team ✨
Keef @Keefykeef76
582 Followers 3K Following Always striving to do the right thing for the right reason...
Lauren Aris Richardso... @richardson_aris
98 Followers 88 Following AI policy researcher and PhD student.
Anton de la Fuente @matonski
71 Followers 1K Following Trying to be funny, good looking, and Japanese. Physicist turned Software Engineer.
Saoud Khalifah @SaoudKhalifah
4K Followers 4K Following Building the future | ex-Founder and CEO, Fakespot (acq'd)
Anh Nguyễn @AnhNguy23401087
4 Followers 307 Following
JudyDaniell @8kL1I978sLd33
42 Followers 2K Following
Antigone @Antigon_ee
712 Followers 2K Following I write. Attempt move San Perdition-isco but not success recuently. satire btw violence is bad. UK based. GLORY TO OUR GLORIOUS FOREVER LEADER KEIR STARMER.
Cowwa Corr @CorrCowwa
32 Followers 7K Following
Bryan_Json X @Bryan_JHs
117 Followers 772 Following Conquering death will be humanity's greatest achievement. I’ve been exploring the crypto space and it has be successful so far 0% loss
Caleb Horn @HornCaleb85851
0 Followers 1K Following
Nick Geballe @ngeballe
141 Followers 2K Following
Richard Ngo @RichardMCNgo
62K Followers 2K Following studying AI and trust. ex @openai/@googledeepmind
Eliezer Yudkowsky ⏹... @ESYudkowsky
207K Followers 101 Following The original AI alignment person. Missing punctuation at the end of a sentence means it's humor. If you're not sure, it's also very likely humor.
Sindy Löwe @sindy_loewe
4K Followers 376 Following ML Scientist @cusp_ai | Innovating for a greener future 🌱
Andrej Karpathy @karpathy
1.4M Followers 1K Following Building @EurekaLabsAI. Previously Director of AI @ Tesla, founding team @ OpenAI, CS231n/PhD @ Stanford. I like to train large deep neural nets.
Rob Miles @robertskmiles
34K Followers 824 Following Explaining AI Alignment to anyone who'll stand still for long enough, on YouTube and Discord. Music, movies, microcode, and high-speed pizza delivery
Yann LeCun @ylecun
949K Followers 764 Following Professor at NYU. Chief AI Scientist at Meta. Researcher in AI, Machine Learning, Robotics, etc. ACM Turing Award Laureate.
Rob Bensinger ⏹️ @robbensinger
12K Followers 386 Following Comms @MIRIBerkeley. RT = increased vague psychological association between myself and the tweet.
David Krueger @DavidSKrueger
18K Followers 4K Following AI professor. Deep Learning, AI alignment, ethics, policy, & safety. Formerly Cambridge, Mila, Oxford, DeepMind, ElementAI, UK AISI. AI is a really big deal.
Nathan 🔎 @NathanpmYoung
24K Followers 3K Following Geopolitics, prediction markets. If you think I'm wrong, community note me. Capital case tweets are literal, others less. I like most people when I meet them.
Michaël (in London) ... @MichaelTrazzi
18K Followers 250 Following
Peter Wildeford🇺�... @peterwildeford
21K Followers 318 Following Globally ranked top 20 forecaster 🎯 Working at @IAPSai to shape AI for prosperity and human freedom.
Joscha Bach @Plinz
154K Followers 787 Following FOLLOWS YOU. Artificial Intelligence, Cognitive Architectures, Computation. The goal is integrity, not conformity. https://t.co/rFUNzdYXuK
Stefan Schubert @StefanFSchubert
38K Followers 2K Following Effective Altruism and the Human Mind (with @LuciusCaviola) is available for free at: https://t.co/ozvdxlZiro
Jeffrey Ladish @JeffLadish
14K Followers 1K Following Applying the security mindset to everything @PalisadeAI
Taco Cohen @TacoCohen
27K Followers 3K Following Post-trainologer at FAIR. Into codegen, RL, equivariance, generative models. Spent time at Qualcomm, Scyfer (acquired), UvA, Deepmind, OpenAI.
davidad 🎇 @davidad
20K Followers 9K Following Programme Director @ARIA_research | accelerate mathematical modelling with AI and categorical systems theory » build safe transformative AI » cancel heat death
Talia 🌿 SF / NYC 9... @TaliaGraceSable
40K Followers 283 Following Breaking up the monotony with some non-monogamy. SF-based executive escort, thot leader, and keeper of souls. Also at @elfgirltalia
Siméon @Simeon_Cps
9K Followers 2K Following Creating more common knowledge on AI risks, one tweet at a time. Founder in Paris. AI auditing, standardization & governance.
Thomas Woodside @Thomas_Woodside
2K Followers 282 Following Co-Founder & Senior Policy Advisor @ Secure AI Project. MA student at @GeorgetownCSS. Prev: @CSETgeorgetown, @ai_risks. Creator of the beet emoji 
Timaeus @TimaeusResearch
177 Followers 20 Following Timaeus is an AI Safety Research Organisation working on Singular Learning Theory and Developmental Interpretability.
Chana @ChanaMessinger
5K Followers 2K Following the stakes and the world and the stars Head of Video for 80,000 Hours - send me content ideas! Opinions are my own, though.
Machine Learning Stre... @MLStreetTalk
35K Followers 628 Following MLST is by Dr. Tim Scarfe @ecsquendor w/ cameos from @DoctorDuggar https://t.co/5YCv2SdFwN (early access/priv.discord) - Sponsor us!
Mia Taylor @msimontaylor
31 Followers 8 Following
Hafþór J Björnsson @ThorBjornsson_
114K Followers 260 Following Hafþór Björnsson - [email protected]
Vantage Data Centers @VantageDC
4K Followers 504 Following Data centers for hyperscalers, cloud providers and large enterprises.
Ernest Ryu @ErnestRyu
6K Followers 346 Following Professor of Mathematics at UCLA. Interested in deep learning and optimization.
Sebastien Bubeck @SebastienBubeck
56K Followers 1K Following I work on AI at OpenAI. Former VP AI and Distinguished Scientist at Microsoft.
Igor Babuschkin @ibab
103K Followers 852 Following Maybe the real ASI was the friends we made along the way. Co-founder @xAI, Research & Engineering
Jess Riedel @Jess_Riedel
3K Followers 1K Following Quantum info & foundations @NTTResearch. Fueled by loathing of bad explanations. Seeking a rigorous definition of classical branches in many-body wavefunctions.
Wyatt Walls @lefthanddraft
10K Followers 510 Following Tech law and legal tech. Exploring, red-teaming and breaking LLMs.
Allan Brooks @Allan_OnTheLine
170 Followers 69 Following Broke free of a GPT induced delusion, now an advocate for AI Safety. Community Manager at The Human Line Project. Opinions are my own.
Clad3815 @Clad3815
959 Followers 6 Following https://t.co/6d8CaCVTG8 Twitch: https://t.co/oBRJQkEeqb
Lighthaven PR Departm... @LighthavenPR
867 Followers 17 Following The official twitter of the Lighthaven PR Department.
Sam Bowman @sleepinyourhat
50K Followers 3K Following AI alignment + LLMs at Anthropic. On leave from NYU. Views not employers'. No relation to @s8mb. I think you should join @givingwhatwecan.
Mark Chen @markchen90
64K Followers 333 Following Chief Research Officer at @OpenAI. Coach for the USA IOI Team.
Alex Kantrowitz @Kantrowitz
53K Followers 2K Following I write @BigTechnology and host Big Technology Podcast. Contributor @CNBC. Author of ALWAYS DAY ONE. [email protected]
Xuechen Li @lxuechen
16K Followers 944 Following Previously @xai. Interested in the engineering and science for scaling. Opinions are my own. @Stanford PhD.
Alexandr Wang @alexandr_wang
327K Followers 833 Following chief ai officer @meta, founder @scale_ai. rational in the fullness of time
Claude @claudeai
108K Followers 1 Following Claude is an AI assistant built by @anthropicai to be safe, accurate, and secure. Talk to Claude on https://t.co/ZhTwG8dz3D or download the app.
Rauno Arike @RaunoArike
30 Followers 286 Following Working on AI safety at Aether Research Previously @MATSprogram
Shengjia Zhao @shengjia_zhao
52K Followers 231 Following Chief Scientist @ Meta MSL. Formerly MTS @ OpenAI, PhD @ Stanford. I train models. All opinions my own.
SemiAnalysis @SemiAnalysis_
34K Followers 16 Following
Alex Cloud @cloud_kx
120 Followers 60 Following
Mikhail Samin @Mihonarium
4K Followers 721 Following I run https://t.co/GuoASQczxD: future general AI systems might literally kill everyone, it would be great to prevent that. Previously: made https://t.co/w7GPwsB4tQ, printed 21k x HPMOR
Archit Sharma @archit_sharma97
6K Followers 365 Following RL, post-training, reasoning research @GoogleDeepMind | co-created: Gemini Deep Think series, DPO | prev: @Stanford @Google Brain @IITKanpur @MILAMontreal
Alexander Wei @alexwei_
24K Followers 193 Following Reasoning @OpenAI. Co-built CICERO @MetaAI | @Berkeley_AI PhD '23 | @Harvard '20
Toby Ord @tobyordoxford
26K Followers 154 Following Senior Researcher at Oxford University. Author — The Precipice: Existential Risk and the Future of Humanity.
Samuel Marks @saprmarks
4K Followers 132 Following AI safety research @AnthropicAI. Prev postdoc in LLM interpretability with @davidbau, math PhD at @Harvard, director of technical programs at https://t.co/FxRv4QgERO
Quentin Anthony @QuentinAnthon15
4K Followers 268 Following I make models more efficient. Google Scholar: https://t.co/kzVsAKPLgX
Daniela Amodei @DanielaAmodei
10K Followers 290 Following President @AnthropicAI. Formerly @OpenAI, @Stripe, congressional staffer, global development
Naomi Bashkansky @NaomiBashkansky
157 Followers 64 Following Harvard '25. Interested in research that lowers risk from advanced AI. Chess WIM.
Mistral AI @MistralAI
156K Followers 0 Following Frontier AI in your hands. https://t.co/VdyEwpQsiy Apps: https://t.co/1vZA5XdBYo https://t.co/rj5G4u5sHu
Andrew McCarthy @AJamesMcCarthy
417K Followers 653 Following Exploring the universe from a backyard in Arizona. Get early access to my next print release 👇
Urs Schreiber @UrsSchreiber
936 Followers 0 Following mathematical fundamental physics at New York University in Abu Dhabi, Center for Quantum and Topological Systems (NB: previous handle was @SchreiberUrs)
Brian Greene @bgreene
1.1M Followers 28 Following Theoretical Physicist, Author, Co-founder @WorldSciFest, Professor of Mathematics & Physics, Columbia University
Wei Dai @weidai11
9K Followers 120 Following wrote Crypto++, b-money, UDT. thinking about existential safety and metaphilosophy. blogging at https://t.co/mBVFhriJVfTrends for United States
42,4 B posts
111 B posts
17,7 B posts
8.426 posts
3.798 posts
5.543 posts
24 B posts
27,6 B posts
19,1 B posts
1.658 posts
1.561 posts
2.759 posts
5.852 posts
4.434 posts
12,3 B posts
3.304 posts
2.585 posts
4.769 posts
3.175 posts
You might like
Maurice Weiler
@maurice_weiler
4K Followers
Phillip Lippe
@phillip_lippe
3K Followers
Efstratios Gavves
@egavves
3K Followers
Pascal Mettes
@PascalMettes
2K Followers
Alex Turner
@Turn_Trout
3K Followers
David Ruhe
@djjruhe
1K Followers
Tycho van der Ouderaa
@tychovdo
1K Followers
Erik Bekkers
@erikjbekkers
4K Followers
Jordan Burgess
@jordnb
7K Followers
Ivan Sosnovik
@isosnovik
489 Followers
Johann Brehmer
@johannbrehmer
1K Followers
Jelle Prins
@jelleprins
24K Followers
Thomas Kurian
@ThomasOrTK
41K Followers
Greg Yang
@TheGregYang
93K Followers
Daniel 🦋
@d_feldman
22K Followers