Gary Marcus

OG GenAI Skeptic; spoke at US Senate. Warned about hallucinations in 2001. Advocating world models & neurosymbolic AI ever since. Author, Marcus on AI & 6 books

[Gary Marcus @GaryMarcus]

Three thoughts on what really matters:

1. Fuck cancer
2. Friends are irreplaceable
3. The new "Marcus test" for AI is when AI makes a significant dent on cancer

May that happen sooner, much sooner, rather than later.

In memory of my childhood friend Paul.

[Gary Marcus @GaryMarcus]

@HurlsDa because they are hemorrhaging money

[Gary Marcus @GaryMarcus]

death of tokenmaxxing = potentially a very serious issue for all three big IPOs.

[Roger @rdd147]

🚨 Sam Altman warns OpenAi and Anthropic are experiencing severe pullback on Ai spending as companies put significant restraints on spending to restrict costs. The company warns investors it’s the first time this has happened in Ai and something we never expected. The buildout costs aren’t sustainable to allow profitability to hyperscalers or end users.

$soxx $dram

[Gary Marcus @GaryMarcus]

@nejsnave alas all the crazy revenue growth that supported recent giant jumps in valuation were tied it. and given how much money they are burning, it’s a risk if they can’t IPO at very high valuations

[Gary Marcus @GaryMarcus]

@Extratemporary i didn’t say “death” of IPO; you did

[Gary Marcus @GaryMarcus]

@RouleurCapital what part of what i quoted did you not understand? “ Sam Altman warns OpenAi and Anthropic are experiencing severe pullback on Ai spending as companies put significant restraints on spending to restrict costs.”

blocked for doing what you accused me of

[Nicholas Kristof @NickKristof]

AI companies wouldn't enslave engineers, or steal chips from Nvidia, or illegally tap a power line. So why, asks @AGSNYT, do they feel entitled to "a brazen theft of intellectual property" from news organizations? Excellent speech: https://t.co/VIQkW4vcot

[Gary Marcus @GaryMarcus]

@RomeoLupascu even then no *control* to their artists

[Gary Marcus @GaryMarcus]

Sam Altman swearing to tell the whole truth to the US Senate an hour or so before he lied his fanny off about caring about artists and creators and wanting them to get a fair shake.

[neil turkewitz @neilturkewitz]

Hey OpenAI, when are you going to do what @sama told Congress was the right thing to do three years ago—to only use creative works to train AI models pursuant to freely & openly negotiated consent & fair compensation? How can an unfairly trained model ever be safe?

@GaryMarcus

[Gary Marcus @GaryMarcus]

I was there, sitting next to Sam Altman in the US Senate, when he said this wonderful thing about artists and creators.

It was a beautiful statement.

In hindsight, though, I realized he was lying (under oath, no less). He didn’t mean any of it; he just tried to work the room.

That’s his M.O. And the world is poorer for it.

[neil turkewitz @neilturkewitz]

Hey OpenAI, when are you going to do what @sama told Congress was the right thing to do three years ago—to only use creative works to train AI models pursuant to freely & openly negotiated consent & fair compensation? How can an unfairly trained model ever be safe?

@GaryMarcus

[Gary Marcus @GaryMarcus]

@MoonlitMonkey69 they aren’t physical laws; they were empirical generalizations that held until they didn’t

[Gary Marcus @GaryMarcus]

This is really intellectually dishonest.

I have not been arguing that LLM token prices are increasing (though the all you can eat buffet is over), I have been arguing the *opposite*, viz that they will go down (e.g., in my recent tweet on commodity pricing that got 1 million views) because there is no moat, and that leaves profitability in doubt.*

You wouldn’t know that from the tweet below, because it completely distorts what I had to say.

===
*Note also that GPT-5 *did* disappoint; I didn’t make that up. A lot of recent progress (eg Claude Code) comes not scaling but from integrating symbolic tools, as I had longed pushed; the guy below doesn’t even address that part of my argument.)

[Ryan Connor | RockawayX 🇺🇸 @ryanconnor]

.@realsteveeisman podcast starts out with “I try to convey information as objectively as possible”

then you get 20 minutes of @GaryMarcus telling you gpt-5 disproves scaling laws & and LLM token prices are increasing

[Gary Marcus @GaryMarcus]

@ryanconnor deeply dishonest post, from someone who misreported and selectively reported my own remarks. i have qt’d with further details

[Gary Marcus @GaryMarcus]

You don’t need to be @garymarcus to know which way the wind blows.

[Nick Huber @sweatystartup]

I would be way more bullish on AI if it actually worked and was actually replacing real humans at scale.

Nothing is changing and we’re being lied to that a revolution is underway.

The tools don’t work! They are expensive! And high maintenance.

Dot com bubble 2.0.

[Gary Marcus @GaryMarcus]

@pbanavara and note that i have publicly offered Elon two bets, neither of which he took. i would have already won the first (second can’t be adjudicated yet, it’s about 2029)

[Gary Marcus @GaryMarcus]

No one. No one in their right mind.

[Dan O'Dowd @RealDanODowd]

SpaceX is losing money hand over fist, nearly $5bn last year.

@SpaceX’s only profitable business is Starlink, but its new satellites can only be launched by Starship, which the FAA has grounded, again.

Who in their right mind thinks this meme stock of a company is worth $2tn?

[Gary Marcus @GaryMarcus]

@pbanavara if it lists at $135 i will.

[Gary Marcus @GaryMarcus]

@charlotte_stix @SenJohnKennedy agreed, it does not got far enough

[Gary Marcus @GaryMarcus]

🚨 Today is a milestone in US AI policy, and an unbelievable moment for me, personally. 🚨

Here’s what I told @senjohnkennedy was the most important policy to implement, at the US Senate in May 2023, and what Trump signed today.

I can’t take credit for causality, but it’s thrilling to see a wish come true.

May any such oversight be bipartisan, and in the interest of American citizens, and in the interests of humanity as a whole.

[Gary Marcus @GaryMarcus]

@ryanconnor @realsteveeisman excuse me when did i say that LLM token prices increased?

transcribe what i said and give a time stamp?

if this is a lie and you keep it, i will block you.

[Gary Marcus @GaryMarcus]

@unexpected_ape ooh you are correct

[Gary Marcus @GaryMarcus]

What are you investing in? Hopium:

[Sense Receptor @SenseReceptor]

Former BlackRock fund manager Ed Dowd on the stock market:

"If 45% of your market cap is AI and there's no profits yet, what are you investing in?"

"You're investing in future hopium"

"Bain... said there is no ROI, it's a bust"

"the markets can continue to be irrational and go up on this, but the narrative is changing fast"

This clip of Dowd (@DowdEdward), a former BlackRock fund manager and co-founder of Phinance Technologies, is taken from a discussion with Jesse Day (@jessebday) posted to the Commodity Culture YouTube channel on June 2, 2026.