Yann LeCun(@ylecun)

@Pontifex Indeed, AI today does not do or possess any of those things. But at some point in the fut...

Yann LeCun (@ylecun) — Sat, 30 May 2026 13:21:09 GMT

@Pontifex Indeed, AI today does not do or possess any of those things. 
But at some point in the future they will. 

Except perhaps for the spiritual part.
Many humans aren't spiritual either, yet have empathy and are highly moral.

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@CSProfKGD Thanks, Kosta. Slide deck here: https://t.co/GetNmw87hS

Yann LeCun (@ylecun) — Thu, 28 May 2026 12:12:13 GMT

@CSProfKGD Thanks, Kosta.
Slide deck here:
drive.google.com/file/d/1gHy1Te…

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@Nature NSF secretly blocking grants to Duke, Harvard, Yale, Princeton ... And they will call that ...

Yann LeCun (@ylecun) — Thu, 28 May 2026 08:43:49 GMT

@Nature NSF secretly blocking grants to Duke, Harvard, Yale, Princeton ... 
And they will call that meritocracy 🙄🤬

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Major difference in my mind: - an engineer, given a problem, invents and tries multiple solutions a...

Yann LeCun (@ylecun) — Mon, 25 May 2026 15:05:42 GMT

Major difference in my mind: 
- an engineer, given a problem, invents and tries multiple solutions and stops when the solution is good enough. The goal is product innovation and shipping.
- a scientist asks new questions, proposes various new solutions, compares them (sometimes with old ones), and writes about it. The methodology must be sound or else peers will sneer. The goal is scientific breakthroughs and technological progress.

Both can be called "researchers". Many people can do both: these are activities, not identities.

Importantly, most product innovations are built on scientific breakthroughs and technological innovations that happened 2, 5, 10, or 20 years earlier.

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https://t.co/R5YLI3ybBh

Yann LeCun (@ylecun) — Sun, 24 May 2026 22:30:01 GMT

youtu.be/l3m3RZNgDdw?si…

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Why?

Yann LeCun (@ylecun) — Sat, 23 May 2026 00:19:10 GMT

Why?

The Wall Street Journal@WSJ

Most green-card applicants will need to go abroad to apply for permanent residency at an American consulate, rather than filing from within the U.S. as they do now, the Trump administration announced Friday. on.wsj.com/4v2Fqkr

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People are realizing that AIs are nowhere near human intelligence and learning abilities. Yet they h...

Yann LeCun (@ylecun) — Thu, 21 May 2026 06:46:31 GMT

People are realizing that AIs are nowhere near human intelligence and learning abilities.
Yet they have become very useful by compensating for their lack of common sense, lack of understanding of reality, and limited reasoning and planning abilities, by the accumulation of enormous amounts of declarative knowledge.

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The salvation is Project Tapestry https://t.co/5MOgouVplV

Yann LeCun (@ylecun) — Sun, 17 May 2026 17:46:50 GMT

The salvation is Project Tapestry
thealliance.ai/projects/tapes…

Daniel Jeffries@Dan_Jeffries1

I don't think people understand just how bad it will be if an American open source champion doesn't emerge soon and the big labs succeed in creating modern East Indian companies and ban open models on moronic national security grounds.

"If a credible Western open frontier player does not emerge, the consequences cascade quickly.

This is the inverse of the early Internet wave. In the 2000s and 2010s, Western companies — Google, Facebook, Amazon, Apple, Microsoft — dominated globally while China carved out its own walled garden. 

"The AI version flips that dynamic on its head. 

"Without a credible Western open frontier player, the only open models capable of running entire economies are made in China. If U.S. policy further restricts Chinese open-weight access on national-security grounds, the U.S. ends up with two or three closed Cathedrals serving the U.S. market — and the rest of the world picks the AI stack that is free, capable, self-hostable, and not embargoed. 

"Europe, Africa, Southeast Asia, Latin America, India, the Middle East. 

"Roughly six billion people. 

"Chinese open models become the global default by 2030, and the United States ends up technologically isolated from the majority of the world’s AI users. 

"We would have done it to ourselves."

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Tired of winning

Yann LeCun (@ylecun) — Sat, 16 May 2026 17:32:39 GMT

Tired of winning

Dr. Catharine Young@DrCatharineY

American science is at extraordinary risk. 

NIH has awarded less than half as many grants as it has compared to the past five fiscal years averaged together. 

'I thought we were at rock bottom', the official said. 'We are below rock bottom now.'"

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Tired of winning

Yann LeCun (@ylecun) — Sat, 16 May 2026 16:06:00 GMT

Tired of winning

Marc Porter Magee 🎓@marcportermagee

MIT announces “the number of grad students will be 20 percent less than it was in 2024 — about 500 fewer students”

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https://t.co/zWa7cH9Ikx

Yann LeCun (@ylecun) — Fri, 15 May 2026 17:59:03 GMT

youtube.com/watch?v=ngBraL…

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Fun interview with Jacob Effron on the Unsupervised Learning podcast.

Yann LeCun (@ylecun) — Fri, 15 May 2026 17:56:57 GMT

Fun interview with Jacob Effron on the Unsupervised Learning podcast.

Jacob Effron@jacobeffron

It’s hard to imagine more of a dream Unsupervised Learning guest than @ylecun. Yann is one of the godfathers of AI, and he has some fascinating contrarian views on the limitations of LLMs. It was incredible to get to have a wide-ranging discussion with Yann about these views, reflections on his time at Meta and departure and what’s next for him. We hit on:
▪️ LLM limitations and a path forward for robotics
▪️ Why he left Meta
▪️ How he came to so dramatically disagree with his Turing co-laureates Geoff Hinton and Yoshua Bengio on LLMs
▪️ His predictions for 2027
▪️ His new company AMI and the bet on world models
▪️ Why he compares OpenAI and Anthropic to Sun Microsystems
▪️ Why he tells PhD students to stop working on LLMs

Plus some sharp views on the current safety discourse, how breakthrough research actually happens and what FAIR got right and wrong.

YouTube: youtu.be/ngBraLDqzdI
Spotify: bit.ly/4dL8fvT
Apple: bit.ly/4wxgpiX

Your browser does not support the video tag.

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@eladgil BS. Attention was born in Montréal PyTorch in NYC. AlphaGo in London AlphaFold in London ...

Yann LeCun (@ylecun) — Sun, 10 May 2026 15:19:03 GMT

@eladgil BS. 
Attention was born in Montréal 
PyTorch in NYC.
AlphaGo in London
AlphaFold in London
ESMFold in NYC
Llama 1 in Paris. 
Llama 2 in Paris+NYC+SV
DeepSeek in Hangzhou

Plus:
DINO in Paris
JEPA in Montréal+Paris+NYC

SV is 3 mos ahead on topics SV is singularly obsessed with.

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Corruption, part N+1

Yann LeCun (@ylecun) — Wed, 06 May 2026 21:06:14 GMT

Corruption, part N+1

Republicans against Trump@RpsAgainstTrump

Someone quietly placed a massive $920 million crude oil short at 3:40 a.m. ET this morning.

Just 70 minutes later, Axios reported the U.S. and Iran were close to a 14 point deal to end the war. Oil prices crashed, and someone made a fortune.

The golden age of corruption.

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Corruption, part N

Yann LeCun (@ylecun) — Wed, 06 May 2026 21:06:01 GMT

Corruption, part N

No Lie with Brian Tyler Cohen@NoLieWithBTC

Palm Beach International Airport is now officially renamed to Donald J. Trump International Airport. 

The airport will be required to purchase official Trump merchandise, directly violating the Emoluments Clause of the Constitution.

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RFKjr == Lyssenko

Yann LeCun (@ylecun) — Wed, 06 May 2026 06:17:41 GMT

RFKjr == Lyssenko

The New York Times@nytimes

Breaking News: The FDA has blocked publication of research that found widely used Covid-19 and shingles vaccines were safe. nyti.ms/49dtF24

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This could have covered the entire budget of the National Science Foundation for 10 years. Instead...

Yann LeCun (@ylecun) — Mon, 04 May 2026 16:44:38 GMT

This could have covered the entire budget of the National Science Foundation for 10 years. 

Instead, Trump wants to reduce the NSF budget by 50% ($5B a year instead of $9B), which would decimate the American scientific research ecosystem, dramatically reduce the number of PhD graduates, and destroy the technology innovation flywheel.

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https://t.co/cfwFhKL5Aw

Yann LeCun (@ylecun) — Sat, 02 May 2026 20:07:19 GMT

youtu.be/kYkIdXwW2AE?si…

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Trump's war on science.

Yann LeCun (@ylecun) — Thu, 30 Apr 2026 00:05:29 GMT

Trump's war on science.

Max Kozlov@maxdkozlov

The Trump administration has downsized US science by historic margins — but it's not just via grant or workforce cuts.

Our new @nature analysis reveals the government has cut more than 100 scientific advisory panels across all major science agencies.

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Shooting oneself in the foot? Nope. Shooting oneself in the prefrontal cortex.

Yann LeCun (@ylecun) — Sun, 26 Apr 2026 13:51:41 GMT

Shooting oneself in the foot?
Nope.
Shooting oneself in the prefrontal cortex.

News from Science@NewsfromScience

U.S. President Donald Trump has fired all 24 members of the National Science Board, the body that oversees the National Science Foundation. Many science advocates see it as the latest step by his administration to erode—some would say destroy—the independence of the 76-year-old research agency. scim.ag/4eGM0YS

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1. I never said LLMs were not useful. They are, particularly with all the bells and whistles that ar...

Yann LeCun (@ylecun) — Fri, 24 Apr 2026 11:19:36 GMT

I never said LLMs were not useful. They are, particularly with all the bells and whistles that are being added to them. I use them.
A robot-rich future can't be built with AIs that don't understand the physical world and don't anticipate the consequences of their actions. And LLMs really don't.
The future in the cartoon looks pretty dystopian TBH, but even a non-dystopian version will require  world models and zero-shot planning abilities.
I rarely wear a suit and absolutely never wear a tie.
I would never ever place a coffee mug on top of a piece equipment.
I hope I'll look this young in 2032.

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Actually, AI already saves lives. In several countries, mammograms are examined by AI and radiologi...

Yann LeCun (@ylecun) — Thu, 23 Apr 2026 11:41:35 GMT

Actually, AI already saves lives. 
In several countries, mammograms are examined by AI and radiologists. Reliability is improved. 
In the EU, every car sold must be equipped with Automatic Emergency Braking Systems. That's AI. They reduce frontal collisions by 40%.
Modern MRI machines are equipped with AI technology that reduces the time of imaging by 4x or more. You can now get a full-body MRI in 40 minutes for about $1000. Reduced time -> reduced cost -> more/earlier detection.
And that's not counting the progress in medicine enabled by modern AI, including Nobel Prize-winning protein structure prediction.

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@AYi_AInotes Exactly 👌

Yann LeCun (@ylecun) — Tue, 21 Apr 2026 13:29:23 GMT

@AYi_AInotes Exactly 👌

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@AYi_AInotes I approve this message 😊

Yann LeCun (@ylecun) — Tue, 21 Apr 2026 13:25:56 GMT

@AYi_AInotes I approve this message 😊

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I love Geoff. But he understands even less than Dario about the effects of technological revolutions...

Yann LeCun (@ylecun) — Mon, 20 Apr 2026 12:18:26 GMT

I love Geoff.
But he understands even less than Dario about the effects of technological revolutions on the labor market.
Again, don't listen to AI scientists, as brilliant as they might be, and even less to AI CEOs, as successful as they might be, for questions of labor economics.
Listen to reputable economists who have studied these things like @Ph_Aghion , @DAcemogluMIT , @erikbryn , @amcafee , @davidautor , etc.

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Dario is wrong. He knows absolutely nothing about the effects of technological revolutions on the la...

Yann LeCun (@ylecun) — Sat, 18 Apr 2026 21:07:15 GMT

Dario is wrong.
He knows absolutely nothing about the effects of technological revolutions on the labor market. 
Don't listen to him, Sam, Yoshua, Geoff, or me on this topic.
Listen to economists who have spent their career studying this, like @Ph_Aghion , @erikbryn , @DAcemogluMIT , @amcafee , @davidautor

TFTC@TFTC21

Anthropic CEO Dario Amodei: “50% of all tech jobs, entry-level lawyers, consultants, and finance professionals will be completely wiped out within 1–5 years.”

Your browser does not support the video tag.

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And yes, Lush/SN used a homegrown Lisp interpreter, to which a compiler was added in the early 1990s...

Yann LeCun (@ylecun) — Sat, 18 Apr 2026 20:57:50 GMT

And yes, Lush/SN used a homegrown Lisp interpreter, to which a compiler was added in the early 1990s.

Artur Chakhvadze@norpadon

@TradeTexasBig Oh, it wasn't even CL, it was its own language!
lush.sourceforge.net/lush-manual/tu…

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The tensor engine was first implemented inside SN3 (before it was called Lush) in 1992 at Bell Labs ...

Yann LeCun (@ylecun) — Sat, 18 Apr 2026 20:54:20 GMT

The tensor engine was first implemented inside SN3 (before it was called Lush) in 1992 at Bell Labs by Léon Bottom and me.
The naming convention has survived to this day in PyTorch and other libraries.

The naming of the tensor operations was reused in EBlearn (C++ deep learning library written by Pierre Sermanet and me, with some help from @soumithchintala).
It was recycled in Torch5 and Torch7, which was written largely by Ronan Collobert, and my students  Clément Farabet, and @koraykv ). Clément and Koray had been brought up on Lush (the open version of SN) and knew the nomenclature. 
Then, Soumith used the same conventions in PyTorch.

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Destroying a library brings the dark ages.

Yann LeCun (@ylecun) — Thu, 16 Apr 2026 11:04:33 GMT

Destroying a library brings the dark ages.

David Sirota@davidsirota

Destroying the @InternetArchive's @WayBackMachine would be the equivalent of the burning of the Library of Alexandria - one of the worst losses of knowledge in history.

Media giants are now threatening to do this. 

We can't let this happen.

Pass it on.

Your browser does not support the video tag.

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Tired of winning

Yann LeCun (@ylecun) — Wed, 15 Apr 2026 21:28:52 GMT

Tired of winning

James E. Clyburn@RepJamesClyburn

Trump has abandoned our farmers with his senseless war in Iran. The impact is worst in the South.

Diesel prices are up 46% since the war began. Nitrogen fertilizer is up 30%.

In the South, 81% of farms—including 84% of small farms—didn’t pre-book fertilizer, meaning they’re now stuck paying rapidly rising prices.

78% of Southern farmers say they can’t afford the fertilizer inputs they need this season.

58% of farmers nationwide say they’re worse off than a year ago.

Farmers in South Carolina and across the country were already struggling. Trump’s war has only made it worse.

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Tired of winning

Yann LeCun (@ylecun) — Mon, 13 Apr 2026 12:45:08 GMT

Tired of winning

Kenneth Roth@KenRoth

“Americans die of treatable conditions at nearly twice the rate as Spaniards, French, Japanese and Australians,” but Trump wants to divert huge sums from healthcare to vastly increase the military to fight his pointless wars. trib.al/UnLdoUR

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Tired of winning

Yann LeCun (@ylecun) — Sat, 11 Apr 2026 15:13:39 GMT

Tired of winning

David Axelrod@davidaxelrod

Today, the Iranian regime is still in place.  They still have thousands of missiles and retain their highly enriched uranium and now they're negotiating for a firm grip on the Strait of Hormuz in perpetuity to end the war.
Meanwhile, we've lost 14 U.S. servicemen and women and hundreds more have been wounded; spent tens of billions of dollars; and badly  depleted our supplies battering Iran.
At the same time, inflation  is raging again and gas is at $4.15 a gallon and rising--$1.20 more than the day before we decided to launch a war against Iran.
Remind me again why this was a good idea?

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@elonmusk No single individual will ever be "in charge" of superintelligence.

Yann LeCun (@ylecun) — Tue, 07 Apr 2026 10:56:35 GMT

@elonmusk No single individual will ever be "in charge" of superintelligence.

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@elonmusk Thinking in language has limited applications, largely in coding and mathematics where the...

Yann LeCun (@ylecun) — Sun, 05 Apr 2026 12:35:12 GMT

@elonmusk Thinking in language has limited applications, largely in coding and mathematics where the language itself can help reasoning.

But, as I've been saying for years, thinking manipulates mental models in abstract (continuous) representation space.

Soooo, xAI gonna use JEPA now?

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@nxthompson So much BS

Yann LeCun (@ylecun) — Sat, 04 Apr 2026 21:30:59 GMT

@nxthompson So much BS

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Tired of winning

Yann LeCun (@ylecun) — Sat, 04 Apr 2026 20:59:58 GMT

Tired of winning

Jay Van Bavel, PhD@jayvanbavel

NEWS:  Massive budget cuts for US science proposed again by Trump administration

"It's an extinction-level event for science".

The US government is proposing massive cuts to almost every branch of science, from NASA to the National Institutes of Health. NSF would completely eliminate the social, economic and behavioral sciences directorate.

This would decimate the world's leading scientific system.
nature.com/articles/d4158…

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@ClementDelangue @atreides_sf Let's be real, all closed models profit from open models WITHOUT GIVIN...

Yann LeCun (@ylecun) — Sat, 28 Mar 2026 13:55:51 GMT

@ClementDelangue@atreides_sf Let's be real, all closed models profit from open models WITHOUT GIVING BACK.

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Soon to be announced: first-ever American Bootlicker Award

Yann LeCun (@ylecun) — Fri, 27 Mar 2026 08:13:21 GMT

Soon to be announced: 
first-ever American Bootlicker Award

Republicans against Trump@RpsAgainstTrump

Just when you thought the GOP couldn’t be a more embarrassing cult, Speaker Mike Johnson presented Donald Trump with the “first-ever America First Award”:

“We have created a new award. We are going to do something we’ve never done before. We will honor him with a new award… That’s a beautiful gold statue, appropriate for the new Golden Era in America.”

Your browser does not support the video tag.

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Tired of winning

Yann LeCun (@ylecun) — Mon, 23 Mar 2026 04:17:17 GMT

Tired of winning

Anders Åslund@anders_aslund

An update on Trump's war on Iran:
Although Iran has suffered substantial human losses, the mullahs seem to have reinforced their regime.
Trump has given Iran control of the Strait of Hormuz.
Trump has provoked Iran to substantial bombing of the non-warring Gulf states.
Trump has offered a not very credible threat to Iran about bombing its power stations but Iran has responded with a more credible threat of its own bombing of US allies in the region.
The US cost is enormous both in money & scarce sophisticated arms.
By lifting oil sanctions on Russia & Iran, Trump is greatly strengthening their finances to be used for aggression.
Trump has caused the whole world higher energy prices, possible scarcity, high inflation & less growth. Unless Trump sobers up soon, he will cause a global recession.
Who can stop madman Trump?

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@_helenqu @cosmo_shirley @rdMorel @albertobietti @mikemccabe210 @PolymathicAI JEPA finds abstraction...

Yann LeCun (@ylecun) — Sat, 21 Mar 2026 14:41:50 GMT

@_helenqu@cosmo_shirley@rdMorel@albertobietti@mikemccabe210@PolymathicAI JEPA finds abstractions that enable prediction. 
This is how intelligence and science work: find abstract representations of reality that allow to make predictions.

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Tired of winning

Yann LeCun (@ylecun) — Thu, 19 Mar 2026 15:52:21 GMT

Tired of winning

The Tennessee Holler@TheTNHoller

WELP

fortune.com/2026/03/18/how…

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Universal embeddings FTW 😊 One of the flagship projects at FAIR was to "embed the world" (i.e. rep...

Yann LeCun (@ylecun) — Mon, 16 Mar 2026 18:09:28 GMT

Universal embeddings FTW 😊

One of the flagship projects at FAIR was to "embed the world" (i.e. represent every entity on Facebook).
The name was soon changed to "Filament", deployed internally, and eventually open-sourced as "PyTorch-BigGraph" 
The techniques were more primitive than today!
github.com/facebookresear…C

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These newfangled communication technologies will destroy society.

Yann LeCun (@ylecun) — Mon, 16 Mar 2026 12:22:05 GMT

These newfangled communication technologies will destroy society.

Pessimists Archive@PessimistsArc

People joking that NYC are going to ban free legal advice from books next...

Don't realize NYC already banned free legal advice from newspapers and radio in 1936! via our newest substack: newsletter.pessimistsarchive.org/p/nyc-once-ban…

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The correct answer was "over $4.5B"

Yann LeCun (@ylecun) — Tue, 10 Mar 2026 11:27:35 GMT

The correct answer was "over $4.5B"

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Unveiling our new startup Advanced Machine Intelligence (AMI Labs). We just completed our seed round...

Yann LeCun (@ylecun) — Tue, 10 Mar 2026 07:19:28 GMT

Unveiling our new startup Advanced Machine Intelligence (AMI Labs).
We just completed our seed round: $1.03B / 890M€, one the largest seeds ever, probably the largest for a European company.
We're hiring! 

[the background image is the Veil Nebula -  a picture I took from my backyard, most appropriate for an unveiling]

More details here:
techcrunch.com/2026/03/09/yan…

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@elonmusk Tesla will be the first company to make Artificial Grokon Intelligence.

Yann LeCun (@ylecun) — Wed, 04 Mar 2026 10:33:16 GMT

@elonmusk Tesla will be the first company to make Artificial Grokon Intelligence.

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Not tired of winning but clearly afraid of losing

Yann LeCun (@ylecun) — Fri, 27 Feb 2026 15:22:52 GMT

Not tired of winning but clearly afraid of losing

Phillips P. OBrien@PhillipsPOBrien

People who don’t understand that we are about to witness a massive attempt to corrupt American democracy by Trump, are living in a dream land.

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Tired of winning

Yann LeCun (@ylecun) — Fri, 27 Feb 2026 15:17:50 GMT

Tired of winning

Denis Wirtz@deniswirtz

Federal funding for US biomedical research is moribund.

Since October 1 2025, NIH is -80% in new grants and -70% in values (total dollars).

Labs are closing down and researchers are leaving science.

To what end?