Yann LeCun(@ylecun)

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.”

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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.

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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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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.”

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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"

Susan Zhang@suchenzang

hypothetically, if yann lecun fundraised for a new AGI lab for himself... 

how much would it be worth?

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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?

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Tired of winning

Yann LeCun (@ylecun) — Thu, 26 Feb 2026 15:15:09 GMT

Tired of winning

Steven Rattner@SteveRattner

Trump painted a picture of an American economy flush with jobs. In reality, he brought job growth to a halt.

My @Morning_Joe Chart

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Tired of winning

Yann LeCun (@ylecun) — Wed, 25 Feb 2026 20:53:47 GMT

Tired of winning

Scott Lincicome@scottlincicome

"Wherever you look in financial markets, you see signs that global investors are going out of their way to avoid Donald Trump’s America." ft.com/content/cfdc8e…

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Tired of winning

Yann LeCun (@ylecun) — Tue, 24 Feb 2026 17:27:14 GMT

Tired of winning

Steven Rattner@SteveRattner

At his State of the Union tomorrow, Trump is sure to brag that his economy is booming. But Americans know that jobs are hard to find these days — under Trump’s watch, the number of unemployed job seekers surpassed the number of openings.

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Tired of winning

Yann LeCun (@ylecun) — Tue, 24 Feb 2026 13:40:38 GMT

Tired of winning

Roman Sheremeta 🇺🇸🇺🇦@rshereme

U.S. job market is in one of the worst recessions in decades.

As an economist, I can confidently say that Trump is the most incompetent president of my lifetime.

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@_amirbar Way more substantial comments on LinkedIn and Facebook than on X for paper announcements ...

Yann LeCun (@ylecun) — Sun, 22 Feb 2026 03:15:38 GMT

@_amirbar Way more substantial comments on LinkedIn and Facebook than on X for paper announcements 
It's been obvious for quite a while that X is lost for science.

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Corruption

Yann LeCun (@ylecun) — Sat, 21 Feb 2026 16:01:08 GMT

Corruption

Meet Kevin@realMeetKevin

🚨 Howard Lutnick's family firm bought up the rights to tariff refunds for 20-30 cents on the dollar after Liberation Day last year.

Today, the Supreme Court struck the tariffs down. For every $100 invested, Lutnick's sons just made 3-5x.

Welcome to Crony Corrupt America.

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Tired of winning

Yann LeCun (@ylecun) — Sat, 21 Feb 2026 06:09:03 GMT

Tired of winning

Steven Rattner@SteveRattner

Federal debt held by the public is forecasted to reach 156% by 2050. And unfortunately, projections have historically undershot reality.

My @Morning_Joe Chart

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Tired of winning

Yann LeCun (@ylecun) — Sat, 21 Feb 2026 06:08:52 GMT

Tired of winning

Justin Wolfers@JustinWolfers

The President says he has cut the trade deficit by 78%. But this chart (which tells the truth) tells a very different story. 

We had this big lousy trade war, and we've got nothing to show for it.

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ML engineer != academic scientist American scientists who are faculty members at top universities ...

Yann LeCun (@ylecun) — Mon, 09 Feb 2026 02:07:07 GMT

ML engineer != academic scientist 

American scientists who are faculty members at top universities don't get millions either, even in AI.

Though they do get paid a lot more than their French counterparts.
CS profs in US research universities typically get $150k to $400k/year depending on seniority and status.

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@andrewgwils Large and profitable AI companies have more than enough resources to work on long-term ...

Yann LeCun (@ylecun) — Sun, 08 Feb 2026 16:17:10 GMT

@andrewgwils Large and profitable AI companies have more than enough resources to work on long-term research breakthroughs while *simultaneously* working on shorter-term frontier model development within the current paradigm. 
If they don't do it, it's because they choose not to.

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Dude, government investment in AI in France is actually quite large. For example, France has had a ...

Yann LeCun (@ylecun) — Sat, 07 Feb 2026 17:48:37 GMT

Dude, government investment in AI in France is actually quite large.

For example, France has had a national GPU clusters for academic researchers for a while: Jean Zay since 2019 (126 pflops) and Alice Recoque in 2026 (1 petaflops). There is still no such thing in the US.

These 30M€ are merely a small pot to attract academics from abroad (salary bump, start-up package, etc). 
That should be compared with what, say, the University of California system spends on attracting new top faculty.

x.com/i/status/20201…

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Tired of winning

Yann LeCun (@ylecun) — Sat, 07 Feb 2026 17:03:21 GMT

Tired of winning

Republicans against Trump@RpsAgainstTrump

It will take years to undo the damage Trump has done to America’s standing in the world.

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Hugo Duminil-Copin, French mathematician and 2022 Field Medalist told me he never participated in ma...

Yann LeCun (@ylecun) — Sat, 07 Feb 2026 15:15:57 GMT

Hugo Duminil-Copin, French mathematician and 2022 Field Medalist told me he never participated in math competition and was very bad at it.
Innovative mathematics requires creativity, intuition, intense concentration, and long reflections, sometimes spread over several years.
Good performance at a math olympiad merely tests fast problem solving abilities. AI can do that nowadays.
One of the big activities of a researcher, in mathematics and elsewhere, is not to answer questions but to ask the right questions.

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Tired of winning

Yann LeCun (@ylecun) — Fri, 06 Feb 2026 04:22:53 GMT

Tired of winning

Steve Hanke@steve_hanke

As Trump's tariffs kicked in, US hiring stalled in the 2nd and 3rd quarters of 2025.

TRUMP'S TARIFFS = A JOB KILLER.

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Tired of winning

Yann LeCun (@ylecun) — Fri, 06 Feb 2026 00:18:02 GMT

Tired of winning

Yann LeCun@ylecun

Tired of winning?

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Tired of winning

Yann LeCun (@ylecun) — Thu, 05 Feb 2026 23:56:44 GMT

Tired of winning

Republicans against Trump@RpsAgainstTrump

Trump is hurting the U.S. dollar.

He’s hurting the economy.

He’s hurting our relationships with allies.

He’s tearing America apart with hatred and division.

When will Republicans in Congress say enough is enough?

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Tired of winning

Yann LeCun (@ylecun) — Thu, 05 Feb 2026 23:55:43 GMT

Tired of winning

Simon Kuestenmacher@simongerman600

One country stands out in the global reputation chart for 2025. The US lost massive good will globally. I ln my world as a public speaker I hear of conferences not being held in the US for the foreseeable future and of academics choosing Canada for their sabbatical over the US. Recent news from Germany is that the government moves away from Microsoft products. Isolated small trends that nonetheless point into the same direction.

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Tired of winning

Yann LeCun (@ylecun) — Thu, 05 Feb 2026 23:47:42 GMT

Tired of winning

Steven Rattner@SteveRattner

Before Trump took office, retail prices were trending downwards. His tariffs reversed that pattern.

My @Morning_Joe Chart

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Tired of winning?

Yann LeCun (@ylecun) — Thu, 05 Feb 2026 23:15:53 GMT

Tired of winning?

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Fast publication accelerates progress. The mantra of the open source movement "release early, relea...

Yann LeCun (@ylecun) — Wed, 04 Feb 2026 14:07:53 GMT

Fast publication accelerates progress. 
The mantra of the open source movement "release early, release often" applies to research as well as software. 
The "cathedral" model is less efficient than the "bazar" model.
The former is like batch gradient and later like stochastic gradient.
en.wikipedia.org/wiki/The_Cathe…

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Pedophile and racist.

Yann LeCun (@ylecun) — Tue, 03 Feb 2026 03:30:43 GMT

Pedophile and racist.

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https://t.co/vD2jFtHM7O

Yann LeCun (@ylecun) — Sun, 01 Feb 2026 21:57:16 GMT

youtu.be/MWMe7yjPYpE?si…

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Nazis

Yann LeCun (@ylecun) — Sat, 31 Jan 2026 22:06:06 GMT

Nazis

Ounka@OunkaOnX

ICE seen detaining parents and guardians at schools during pick-up times

Your browser does not support the video tag.

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@elonmusk @farzyness Actually, quite the opposite. I know I can do it and I know how to do it. Just ...

Yann LeCun (@ylecun) — Tue, 27 Jan 2026 16:22:01 GMT

@elonmusk@farzyness Actually, quite the opposite.
I know I can do it and I know how to do it.
Just not with the techniques everyone is currently betting on.
My bet is (famously) on JEPA, world models, and planning.
At some point, you'll realize I'm right 😅

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Free speech?

Yann LeCun (@ylecun) — Tue, 27 Jan 2026 14:03:34 GMT

Free speech?

Senator Scott Wiener@Scott_Wiener

TikTok is now state-controlled media.

This morning I posted a TikTok about my legislation allowing people to sue ICE agents. It's sitting at zero views, and I'm not the only person this is happening to.