> it's not just about saving costs – it's about saving the planet. I have joined OpenAI to work on this challenge directly.

I couldn't go on reading.

• bspammer

  today at 10:10 AM

  Plenty of other hints too

  > Do anything, do it at scale, and do it today

  > It's not just GPUs, it's everything.

  > I'm not the first, I'm just the latest.

• throwa356262

  today at 9:34 AM

  Reminds me of the TechCrunch episode of Silicon Valley TV show. Everyone was there to make the big buck but all collectively pretended they were doing their work for the good of humankind.

  This guy and Rob Pike should have a talk.

  • heeton

    today at 10:22 AM

    [delayed]

• moomoo11

  today at 10:03 AM

  I meet people like this irl. I block them.

• allovertheworld

  today at 9:53 AM

  AI slop writing for AI slop business

Did the article intentionally start with a LLM cliche to filter out all the people who hate reading obviously generated content? I would say it worked.

• laluser

  today at 8:36 AM

  I have been attempting to write a lot more with AI, but it's so gimmicky. It's always spitting lines like this: " it's not just about x – it's about y." like in this post. I find it so frustrating that no matter the prompt I throw at it, it eventually repeats itself again after some time. Good technical and succinct writing is almost impossible to iterate on with AI for me.

  • xnxnxkx

    today at 9:08 AM

    [flagged]

• mawadev

  today at 9:24 AM

  I like how my eyes went over the first sentence, barely parsing it and already discarding the information, because its obviously ai generated. Its like the circumstances we live in added a new layer of perception to my brain to guard itself against the flood of useless information!

  • Nasrudith

    today at 10:09 AM

    It isn't AI generated it is just plain a vacuous cliche. Seriously what is with people who think 'they can always tell it is AI' when really AI is living rent free in their head and they fixate on anything they don't like and are oh so convinced it must be the AI they hate. They're exactly like Fundamentalists and the devil. Or Communists and how they think capitalism literally intentionally created everything as harmful as possible just to spite them.

• jofzar

  today at 8:03 AM

  Worked on me, I read the first paragraph and decided against reading it.

• raincole

  today at 9:45 AM

  I really hope it's intentional. The author is a smart, accomplished person. He even published books. It's sad if this kind of person thinks it's okay to just outsource their writing to AI.

The AI industry, and SV tech generally, has a pattern of recruiting talent by flattering people's self-image as builders and discoverers, which makes it psychologically very difficult for those people to reckon honestly with downstream harm.

To answer a few people at once: I did mention compensation as a factor in the post, but I didn't elaborate details, so easy to miss. Comp is important of course, but so are the other factors. It feels like I can't go for a day without reading about the cost of AI datacenters in the news, and I can do something about it.

• brendangregg

  today at 4:21 AM

  Again, many comments here saying I only care about the money, and while comp is an important factor I think it characterizes me as someone I'm not, and forgets what I've been doing for the past two decades. I've spent thousands of hours of my life writing textbooks for roughly minimum wage, as I want to help others like me (I came from nothing, with no access tech meetups or conferences, and books were the gateway to a better job). I've published technologies as open source that have allowed others to make millions and are the basis for many startups. I'm also helping pioneer remote work and hoping to set a good example for others to follow (as I've published about before). So I think I'm well known for caring about a lot of things during the past couple of decades.

  • pillefitz

    today at 7:16 AM

    The issue is that you're doing lot, but not saving the planet.

    What do you think is happening with the efficiency gains? You're making rich people richer and helping AI to become an integral (i.e. positive ROI from business perspective) part of our lives. And that's perfectly fine if it aligns with your philosophy. It's not for quite a few others, and you not owning up to it leads to all kinds of negativity in the comments.

    • trhway

      today at 7:30 AM

      >What do you think is happening with the efficiency gains?

      may it happen that the efficiency gains decrease demand and thus postpone investment into and development of new and better energy sources? If one couldn't get by just by bringing 20 trucks with gas turbines, may be he would have invested in fusion development :)

      • nextaccountic

        today at 9:08 AM

        > may it happen that the efficiency gains decrease demand

        What mechanism would make this happen?

        Demand could decrease if AI became worse, but efficiency doesn't make AI worse - it actually makes possible at all to run bigger, better models (see the other comment with a link to Jevon's paradox), which increase, not decrease demand (more powerful models may have new capabilities that people want to use)

        Alternatively, AI demand could decrease through political pressure (either anti-AI sentiment takes a foothold on the public, and/or government regulation strangle demand on the sector like it did for eg. on tobacco industry). But another way to reap the benefits of more efficient AI datacenters is to make it a talking point on how AI environmental impacts can be mitigated, which could curb anti-AI sentiment.

        Either way, those possibilities don't decrease demand for AI - they are either neutral, or increase demand instead.

      • T-A

        today at 7:57 AM

        > may it happen that the efficiency gains decrease demand

        https://en.wikipedia.org/wiki/Jevons_paradox

  • altmanaltman

    today at 7:50 AM

    It's okay to want to make money. You don't really have to justify it this hard unless you want people to really think you don't think comp is important, which is a bit sus to be fair.

    • matwood

      today at 8:25 AM

      Even if people don't want it to be about the money, it's still about the money because of the world we live in. Good vibes don't pay the mortgage or put food on the table. More money equates to better health and future outcomes for a person and their family, so how couldn't it always be about the money?

      Of course once someone has money they can say it's not about the money, but that privilege is literally bought with...money.

    • brendangregg

      today at 8:07 AM

      When did I say I don't think comp is important?

      • nlitened

        today at 8:10 AM

        Sir, your top three comments in the comment section are about how not important the compensation package is for you

        • brendangregg

          today at 8:54 AM

          No, that's not what they say.

          • deely3

            today at 9:17 AM

            But they really are?

      • yosefk

        today at 8:18 AM

        Thank you very much for your work. I think people envious of someone's compensation don't deserve a response

      • wakkawukka

        today at 8:33 AM

        Thermodynamics though.

        Reducing runtime energy use over years won't really make up for the resource use that goes into building the data center. It's just moved around, similar to how Elon moves around money as needed to bolster the financials of a particular project.

        Like with the airline industry it's not just the smog they blow on our food. Drink carts, seat belts, barf bags all have a resource intensive energy and materials pipeline.

        Every server screw and power cable adds up.

  • bigtones

    today at 7:27 AM

    Great to see you're in Sydney Brendan, and let the haters hate.

    You have done a brilliant job elevating your chosen specialty to the world, and encouraging and inspiring others in the industry for a long time - so you should be fairly compensated for that lofty position. I don't envy the late nights or very early mornings you have ahead of you on conference calls with SF, but good luck at OpenAI mate !

  • snayan

    today at 4:38 AM

    I mean, I don't know you well, but, I see your posts on here from time to time and from what I gather you are very, very, exceptional at what you do.

    Reality is, these AI giants are here and they are using a massive amount of resources. Love them or hate them, that is where we are. Whether or not you accept the job with them, OpenAI is gonna OpenAI.

    Given how much the detractors scream about resource uses, you'd think they'd welcome the fact that someone of your calibre is going in and attempting to make a difference.

    Which, leads me to believe you're encountering a lot of projecting from people who perhaps can't land the highest of comp roles, and shield their ego by ascribing to the concept of it being selling out, which they would of course never do.

    • gsf_emergency_6

      today at 5:30 AM

      It's probably impossible to prove I'm not projecting..

      However. I am putting my curious foot forward here:

        What were the toughest ethical quandaries you faced when deciding to join OpenAI?
      

      To give a purely hypothetical example which is probably not relevant to your case: if I had to choose DeepSeek or OpenAI, I think I would struggle with openness of the weights..

  • lelanthran

    today at 9:03 AM

    > I've spent thousands of hours of my life writing textbooks

    I'm surprised at this; all that experience wasn't enough to flag this article as obviously AI generated?

    More to the point, with all that experience you still weren't able to issue prompts to make the output sound different from generic AI slop?

  • alephnerd

    today at 4:31 AM

    Ignore the haters (who sadly have become extremely common on HN now).

    I loved your work back when I was an IC, and I'm sure this is a common sentiment across the industry amongst those of us who started systems adjacent! I still refer to your BPF tools and Systems Performance books despite having not written professional code for years now.

    Can't wait to read content similar to what you wrote about when at Netflix and Intel albeit about the newer generation of GPUs and ASICs and the newer generation of performance problems!

    • kgraves

      today at 4:42 AM

      [flagged]

      • raymond_goo

        today at 5:11 AM

        Ah, so you you see into the future, got it!

  • biggggtalkguy

    today at 4:55 AM

    [flagged]

  • belter

    today at 5:56 AM

    Brendan, your work has been transformative. I own all your books and have probably read every technical blog post twice.

    I hope there will be harder problem waiting for you, than using flamegraphs to optimize GenAI Porn.

    https://www.axios.com/2025/10/14/openai-chatgpt-erotica-ment...

• politelemon

  today at 3:16 AM

  It would be good if the performance improvements made can be applicable across the industry so everyone benefits. But it doesn't sound unbelievable that OpenAi may want to keep some of it secret to keep an advantage over others?

  • yunohn

    today at 10:22 AM

    Unbelievable? It’s unfathomable - out of all existing AI companies, OpenAI is the least open of them all. They have stopped contributing any useful research into the public domain. Even infamous villains like Meta and China are doing leaps and bounds more compared to /Open/AI and the like.

• journal

  today at 6:28 AM

  I feel like I can do something about something too but no one is picking me to do anything about anything.

• bahmboo

  today at 3:20 AM

  Thanks for taking the risk in this environment and posting about your experience from a personal standpoint. [environment: people will come at you from all angles with very passionate opinions]

• kgraves

  today at 3:25 AM

  > I stood on the street after my haircut and let sink in how big this was, how this technology has become an essential aide for so many, how I could lead performance efforts and help save the planet.

  Brendan.

  First of all congratulations on your new job. However,

  It is easier to just say to everyone it is about the money, compensation and the stock options.

  You're not joining a charity, or to save the planet, this company is about to unload on the public markets at an unfathomable $1TN valuation.

  Don't insult your readers.

  • 80696527890

    today at 3:55 AM

    [flagged]

    • rvz

      today at 4:07 AM

      For the Benefit of Humanity®

• AnonHP

  today at 3:47 AM

  I’m replying to your comment in the hopes of getting a response. In the blog post, you said:

  > There's so many interesting things to work on, things I have done before and things I haven't.

  What are the things you haven’t done before, if you could mention them?

• jonesetc

  today at 6:30 AM

  >Did fixing it from the inside work for any of those other issues?

  No, it never does. Those people somehow delude themselves into thinking it might, but...it might just work for us.

• today at 5:20 AM

• jcgrillo

  today at 3:32 AM

  Interesting. Out of curiosity, how long do you think OpenAI can survive as a company? Put another way, what would be your guesses for probability of failure on 1yr, 3yr, and 5yr horizons?

  EDIT: possibly a corollary--does Mia pay money for chatgpt or use a free plan?

  • brendangregg

    today at 8:03 AM

    As an engineer I can't comment on future company predictions. It sounds like a question for Sam Altman, as he has discussed risks in the past.

    My wife was paying for ChatGPT before I joined. I didn't ask Mia. I probably have three months of hair growth before my next chance to ask.

• vasco

  today at 6:30 AM

  Turn them off!

• brendangreggg

  today at 3:38 AM

  [dead]

• llmslop

  today at 8:46 AM

  [flagged]

• username223

  today at 3:34 AM

  > Comp is important of course,

  The string "compens" appears exactly once in your post:

  > But there are other factors to consider beyond a well-known product: what's my role, who am I doing it with, and what is the COMPENSation?

  You did it for the money; don't try to rationalize it, because no one believes you. For that amount of cash, I'd probably jump on Altman's bubble for a year or two.

  • gghffguhvc

    today at 3:40 AM

    I believe him. I don’t know him personally but his blog posts pop up here from time to time and this feels genuine to me.

    • buzzerbetrayed

      today at 3:52 AM

      You believe someone taking a fat paycheck isn’t doing it for the fat paycheck?

      Wanna buy a bridge?

      • surajrmal

        today at 4:07 AM

        Humans are complex and have multiple sources of motivation. You don't know whether he took the offer with the highest pay. He's likely wealthy enough that he can pay less attention to his income and focus on his other sources of motivation if he wants to. That's not to say pay is not a factor in his choice, but it need not be the only or primary one. This is a luxury of the privileged for sure, which can make it difficult to relate to.

• DeepYogurt

  today at 3:15 AM

  You gonna open source it?

> ...it's not just about saving costs – it's about saving the planet

There's something that doesn't sit right with me about this statement, and I'm not sure what it is. Are you sure you didn't just join for the money? (edit: cool problems, too)

• pyrale

  today at 7:45 AM

  Probably because "making the world a better place" has been a trope used so much in the industry that it's made it to a TV show [1]. It's fine to be passionate about your job. It's fine to be paid well. You don't need to make us believe that you're mother Theresa on top of it.

  [1]: https://www.youtube.com/watch?v=B8C5sjjhsso

  • gbbloke

    today at 7:51 AM

    What a gem of a TV show.

• robby_w_g

  today at 3:39 AM

  Reminds me of when I was younger and thought of companies like Google and Tesla as a force for good that will create and use technology to make people's lives better. Surely OpenAI and these LLM companies will change the world for the better, right? They wouldn't burn down our planet for short-term monetary gain, right?

  I've learned over the years that I was naive and it's a coincidence if the tech giants make people's lives better. That's not their goal.

• lm28469

  today at 9:54 AM

  > and I'm not sure what it is.

  The obvious lie for a start

• its-kostya

  today at 2:56 AM

  Right? Like what an incredibly naive thing to think, that BG is going to contain power consumption lmao. OpenAI is always going to run their hardware hot. If BG frees up compute, a new workload will just fill it.

  Sure you might argue "well if they can do more with less they won't need as many data centers." But who is going to believe that a company that can squeeze more money from their investment won't grow?

  Tangentially, I am looking forward to learn the new innovations that come from this problem space. [Self-rightous] BG certainly is exceptional at presenting hard topics in an approachable and digestible manner. And now it seems he has an unlimited fund to get creative.

  • tayo42

    today at 3:15 AM

    They're going to grow either way. Those new workloads are going to be run

    • its-kostya

      today at 3:17 AM

      Ya, we know. Just humbling the author ;)

• Thaxll

  today at 3:07 AM

  The AI train is going with or without you, if you can be part of it and improve the situaton, why not.

  • lm28469

    today at 9:54 AM

    if you can be part of it and take a fat check!

  • today at 4:11 AM

• petterroea

  today at 3:50 AM

  Even a 25% reduction in resource usage will probably not be enough, AI datacenters are still a huge resource sink after all

  • raincole

    today at 8:36 AM

    If you reduce energy consumption of training a new model by 25%, OpenAI will just buy more hardware and try to churn out a new model 25% faster. The total consumption will be exactly the same.

    And they're 100% justified to do so, until they hit another bottleneck (when there is literally not that much Nvidia hardware to buy, for example.)

  • skybrian

    today at 3:59 AM

    I imagine there's a lot more to be gained than that via algorithmic improvements. But at least in the short term, the more you cut costs (and prices), the more usage will increase.

• biggggtalkguy

  today at 4:31 AM

  The blog author is the same guy who wrote this when leaving his previous company https://www.brendangregg.com/blog/2025-12-05/leaving-intel.h... :

  > I also supported cloud computing, participating in 110 customer meetings, and created a company-wide strategy to win back the cloud with 33 specific recommendations, in collaboration with others across 6 organizations.

  > My next few years at Intel would have focused on execution of those 33 recommendations, which Intel can continue to do in my absence. Most of my recommendations aren't easy, however, and require accepting change, ELT/CEO approval, and multiple quarters of investment. I won't be there to push them, but other employees can (my CloudTeams strategy is in the inbox of various ELT, and in a shared folder with all my presentations, code, and weekly status reports). This work will hopefully live on and keep making Intel stronger. Good luck.

  OpenAI deserves these big shots.

  • seanhunter

    today at 6:37 AM

    Firstly, you would do well to read the guidelines about avoiding snark, and then actually say whatever it is you’re trying to say rather than make insinuations. As is, this response comes across as a very shallow read. It’s hard to get to the root of what you’re actually saying in your post other than it quotes two paragraphs about how it’s not fun to push through the bureaucracy of a large organisation, which - I would agree. Probably most people who’ve worked at a big company would.

    So why does that make him a “big shot”? Are you perhaps envious of him?

    Why does openAI deserve him or anyone? Hard to say.

• wheelerwj

  today at 2:25 AM

  I stopped reading just after that. “I joined PhilipsMorris to make smoking cigarette smoking safer…”

  The problems are interesting and the pay is exceptional. Just fucking own it.

  • selectodude

    today at 3:26 AM

    He interviewed everywhere and took the biggest offer. Good! Don’t piss on my face and tell me it’s raining.

    • ahf8Aithaex7Nai

      today at 3:42 AM

      It's raining anyway. If I piss on your face, I can at least try to make the experience as positive as possible for you.

• mewpmewp2

  today at 2:19 AM

  [flagged]

  • dang

    today at 3:06 AM

    "Please respond to the strongest plausible interpretation of what someone says, not a weaker one that's easier to criticize. Assume good faith."

    https://news.ycombinator.com/newsguidelines.html

Brendan, I'm a big fan of your book, and work. I don't have a problem with you joining OpenAI; best of luck there!

However, I'm not sure your analysis is quite correct, in this case.

If OpenAI can mobilize X (giga)dollars to buy Y amounts of energy, your work there will not reduce X or Y, it will simply help them produce more "tokens" (or whatever "unit of AI") for a given amount of energy.

So in a sense you're helping make OpenAI tools better, more effective, but it's not helping reduce resource usage.

https://en.wikipedia.org/wiki/Jevons_paradox

• ulnarkressty

  today at 8:20 AM

  Was going to say the same thing, but I'm pretty sure he already knows that. Smart people can convince themselves of everything.

• pillefitz

  today at 7:07 AM

  And the consequence of burning more tokens, of course, is more widespread adoption, weaving AI more deeply into the fabric of our reality.

  • bigyabai

    today at 7:35 AM

    That's a possible second-order effect, but not guaranteed.

This article is so full of itself I can hardly stand to read it. I had to just sort of skim it instead. Sorry! This style just doesn't do it for me.

• notepad0x90

  today at 3:30 AM

  It's a blog post, not an article. A narrative of events, not an interesting write-up on a topic.

• biggggtalkguy

  today at 4:39 AM

  Not the first time either. See this person's previous blog when leaving his earlier company. Lots of Kim kardashian vibe of self inflated self worth.

  • pstuart

    today at 9:09 AM

    The guy is pretty much god-tier in performance engineering -- I'm not seeing the kardashian vibe at all. There's an element of "dear diary" but it reads (to me) as just trying to catalog what he thinks is important to note.

money, mostly

> Mia the hairstylist got to work, and casually asked what I do for a living. "I'm an Intel fellow, I work on datacenter performance." Silence.

How could she not know?

• Insanity

  today at 3:20 AM

  For people who’s main computing devices are phones, this isn’t hard to believe at all.

  Interacting outside of the tech bubble is eye opening. Conversely, the hair stylist might have mentioned the brand of a super popular scissor supplier/other equipment you’d have never heard of.

  • CreepGin

    today at 3:27 AM

    You missed the sarcasm.

    • Insanity

      today at 3:44 AM

      Lol, I did. Needed a /s!

Strong LinkedIn vibes in this entry.

Was it because ChatGPT helped you to write this post?

> She was worried about a friend who was travelling in a far-away city, with little timezone overlap when they could chat, but she could talk to ChatGPT anytime about what the city was like and what tourist activities her friend might be doing, which helped her feel connected. She liked the memory feature too, saying it was like talking to a person who was living there.

This seems rather sad. Is this really what AI is for?

And we do not need gigawatts and gigawatts for this use case anyway. A small local model or batched inference of a small model should do just fine.

• today at 3:07 AM

• mschild

  today at 6:58 AM

  > A small local model or batched inference of a small model should do just fine.

  Or, you know, Signal/Matrix/WhatsApp/{your_preferred_chat_app}. If you're already texting things, might as well do that.

• georgemcbay

  today at 4:23 AM

  > And we do not need gigawatts and gigawatts for this use case anyway. A small local model or batched inference of a small model should do just fine.

  I guess I'm a dinosaur but I think emailing the friend to ask what they are actually up to would be even better than involving an LLM to imagine it.

  Asynchronous human to human communication is a pretty solved problem.

  • lufenialif2

    today at 6:31 AM

    A common cited use case of LLMs is scheduling travel, so being able to pretend it’s somebody somewhere else is for sure important to incentivize going somewhere!

• UltraSane

  today at 3:10 AM

  I use it as something to talk to about incredibly nerdy and/or obscure things no one else would be willing to talk about.

  • rotis

    today at 9:15 AM

    Asking ChatGPT about safety of someone traveling instead of asking that person is the nerdy thing to do. Somehow a hairstylist doesn't invoke image of a nerd in me. That is why I find this story implausible.

  • boxedemp

    today at 8:07 AM

    Same. I have a lot of ideas I like to explore that people find boring or tedious. I used to just read, but it's pleasant to have the option to play with those thoughts more.

  • manuelmoreale

    today at 6:52 AM

    That’s honestly just sad. Not the fact you doing it, but rather the fact you have nobody to talk to about those things.

    • rkomorn

      today at 7:02 AM

      I feel like this kind of response is a good example of why someone wouldn't talk to others about things.

• peyton

  today at 3:10 AM

  It’s super dope, and you can have it talk to people for you in the local language when you go there. I’ve busted it out to explain what I’m thinking for me. Watching travel shows on TV or reading travel magazines is sadder.

Is this LinkedIn post in a blog?

Could you please provide information about the efficiency optimization you plan to implement?

> save the planet

> I'd been missing that human connection

At OpenAI.

Saving the planet and the Trump alliance (https://www.theverge.com/ai-artificial-intelligence/867947/o...) don't seem to relaly jive.

Brendan can do whatever he wants. Hes that good. If anybody seriously needed to interview him 20+ times to figure it out, then the burden is now on them to not fuck it up.

• ojbyrne

  today at 2:14 AM

  The article says "I ended up having 26 interviews and meetings (of course I kept a log) with various AI tech giants."

  I don't think that indicates that any one company interviewed him 20+ times.

• sgarland

  today at 3:23 AM

  Seriously. I would expect him to be more of an offer-only scenario.

• 7e

  today at 2:19 AM

  He's summing interviews across all AI giants. But the ones about to IPO can interview someone almost infinitely many times, because everyone wants on the bandwagon.

Performance and efficiency are important, but we need you to invent the monitoring tools and visualisations that will underpin alignment!

> it's not just about saving costs – it's about saving the planet.

You're in for a surprise buddy.

Apparently, there's this guy who's really good at optimizing computer performance and makes a lot of money doing it. At the same time, he writes mediocre school essays that are actually a bit embarrassing. Guys, if you have the opportunity to land a very well-paid job, then do it. Take the money. Live your life. But please spare us the public self-castration.

> "I'm an Intel fellow, I work on datacenter performance." Silence

Seems like that really hurt.

Man I don't care if you are best engineer in the planet but reading that post made me cringe. Keep your ego under control, please.

Mia was right. Listen to Mia

If it's in your power, make sure user prompts and llm responses are never read, never analyzed and never used for training - not anonymized, not derived, not at all.

• surajrmal

  today at 2:49 AM

  No single person other than Sam Altman can stop them from using anonymized interactions for training and metrics. At least in the consumer tiers.

• satvikpendem

  today at 3:14 AM

  It's a little too late for that, all the models train on prompts and responses.

[flagged]

[dead]

TLDR: Money, Fame and A Glorious IPO (AGI)

Just say you joined for the money and that Intel's stock didn't do a 10,000x run like Nvidia did and he completely missed it.

So the best chance at something like that again is OpenAI when they achieve a 1TN valuation with AGI.

• patrickaljord

  today at 2:17 AM

  Unless OpenAI goes with a very liberal definition of AGI, he's going to wait decades for AGI.

  • Insanity

    today at 3:21 AM

    They’re already trying to redefine the AGI playing field by doing so.

• thefounder

  today at 3:28 AM

  I think OpenAI will IPO at 1T. I don’t want to say bubble but it could be one of these stocks super hyped that never goes anywhere after the IPO(I.e airbnb during Covid)

  • Kina

    today at 6:43 AM

    I believe that OpenAI wants to IPO at that valuation. I don’t think it can IPO.

[flagged]

I am not sure I will be able to forget this vomit-inducing blog post when inevitably I will read one of his quite good books.