frontpage.
newsnewestaskshowjobs

Open Source @Github

fp.

HackerTube: YouTube built from videos recommended by HN

https://karpathy.bearblog.dev/hacker-tube/
170•karpathy•1h ago•82 comments

TCP Use-After-Free: CVE-2026-98432 / CVSS 9.8

https://atlasum.net/blog/cve-2026-98432-linux-ipv4-tcp-uaf
140•oger•2h ago•67 comments

It's the Memory Latency, Stupid

https://pivotlake.io/blog/its-the-memory-latency-stupid/
52•ntur1337•2h ago•8 comments

The Duty of a Scholar

https://www.daemonology.net/blog/2026-10-31-The-Duty-of-a-Scholar.html
55•gslin•2h ago•11 comments

With 86% of the words, you might understand only 38% of an anime's lines

https://learnfromx.com/research/anime-word-coverage-vs-lines-understood
8•lakesare•35m ago•1 comments

GPT-5.6 Sol can beat Factorio on peaceful mode

https://ryanmadden.net/gpt-56-beats-factorio/
118•ryanmadden•2h ago•119 comments

Molly (Signal fork) has not been updated since 3 months and is vulnerable

https://piefed.world/post/1503394
276•DeepLogin•10h ago•159 comments

Show HN: A language model that lives in a boot sector

https://github.com/kerlenton/bootgpt
26•kerlenton•8h ago•0 comments

Jepsen: ParticleDB 1.1.4

https://jepsen.io/analyses/particledb-1.1.4
133•aphyr•7h ago•68 comments

Much Ado About None: Sentinel Values in Python

https://florianwilhelm.info/2026/10/sentinel_values/
22•sebg•1d ago•9 comments

Show HN: NES Contra (1987) port (ASM –> C and then C –> WebAssembly)

https://epoyraz.github.io/nes-contra-us/
18•tevlon•2h ago•11 comments

William Nordhaus has died

https://news.yale.edu/2026/10/31/william-nordhaus-nobel-laureate-who-integrated-economics-and-cli...
36•ilreb•3h ago•7 comments

Do the math: How we took over ChatGPT accounts

https://www.parameter.ai/labs/we-found-a-gap-at-openai
287•armcat•10h ago•139 comments

5 years of OqtaDrive: Microdrive emulation to Sinclair Network over the internet

https://oqtadrive.org/10.other/5-years/
9•xelalex•1d ago•1 comments

Distributed Proofreaders

https://www.pgdp.net/c/
4•gone35•25m ago•0 comments

Noctua Fan Swap on a Calnex Rb/GPS Frequency Reference

https://www.jeffgeerling.com/blog/2026/noctua-fan-swap-calnex-rb-gps-frequency-reference/
27•aray07•2d ago•17 comments

Redox: Ring Buffers Project Summary

https://www.redox-os.org/news/nlnet-rb-summary/
36•g0xA52A2A•3d ago•5 comments

Simple circuits can create complex behaviors

https://aatishb.com/myriad/lets-build-a-brain/
187•aatish•4d ago•61 comments

Surviving "The Graduate"

https://www.newyorker.com/culture/the-weekend-essay/dustin-hoffman-on-surviving-the-graduate
5•samizdis•1h ago•0 comments

Reading and writing are less symmetric than you (probably) think

https://fgiesen.wordpress.com/2015/10/25/reading-and-writing-are-less-symmetric-than-you-probably...
62•luu•3d ago•20 comments

Switch Lowering in GCC

https://xoranth.net/gcc-switch/
184•signa11•13h ago•36 comments

Anthropic blocks users for anything touching training larger models

https://twitter.com/jiahaoshao1/status/2116475922190922088
39•pretext•1h ago•7 comments

Digital minimalism

https://vitalik.eth.limo/general/2026/10/31/digital_minimalism.html
276•wilbertliu•15h ago•207 comments

Serbia just elected the world's brainiest parliament

https://www.science.org/content/article/serbia-just-elected-world-s-brainiest-parliament
753•input_sh•11h ago•436 comments

Show HN: Ghostman – A fast, keyboard-driven TUI API client and webhook inspector

https://github.com/4yk5/Ghostman
35•4yk5•1d ago•24 comments

I post trained a model on Demoscenes

https://datavorous.com/writing/demoscener/
35•datavorous_•3h ago•19 comments

Show HN: A USB-C LTE modem that gives my computer a phone line

https://github.com/Koppar-AI/koppar-lte-modem
30•abijahkaj•5h ago•23 comments

AI, Lean, and the Future of Formal Verification, with Lean Creator Leo de Moura

https://thedataexchange.media/leo-de-moura-lean-aws/
176•datascientist•2d ago•38 comments

Malware uses LLMs to rank victims by how much they're worth

https://blog.talosintelligence.com/appraisal-by-ai-model-driven-victim-prioritization-in-the-volt...
215•khalidkhair•6h ago•116 comments

Casio Watches of the 1980s

https://www.casio.com/us/watches/50th/Heritage/1980s/
181•karagenit•5h ago•94 comments
Open in hackernews

HackerTube: YouTube built from videos recommended by HN

https://karpathy.bearblog.dev/hacker-tube/
160•karpathy•1h ago
YouTube-style UI over 6,454 videos sourced from 39,834 HN comments since 2007.

https://hackertube.org/

Comments

sc970•1h ago
How many tokens (or $) does something like this take to make?
karpathy•55m ago
I'm on subscription but I had Claude add it up: 504M input tokens (90% cached), 7.6M output tokens. 90+% of that was Sonnet calls to label the comments, all of the actual work, the app and deploy etc was ~1M tokens of Opus 5.5, I compacted context once. i.e. very small project by modern standards.
mixtureoftakes•49m ago
Yeah i'm pretty sure this is doable multiple times on a 20 dollar subscription, just wow
mips_avatar•39m ago
I wish someone would make a decision model that’s as good as sonnet but like 10-100x cheaper. Because for this project which is a pretty small dataset you’re spending ~$300 on sonnet usage. like jev can probably do this task but it’s not smart enough to reliably be used
gambiting•11m ago
GLM 5.3 Flash is incredibly cheap and imho as good as or better than Sonnet. I used it recently to fix an old server that my family had running serving some websites, and by fix it I mean I got it to log in over ssh, figure out what's running there, copy it out, log in to a brand new droplet on DO, set up a fresh instance of apache with everything patched up to latest, copy that ancient content over, make sure it runs with latest PHP which required several rounds of fixes, optimize the system so it runs on the smallest 512MB droplet, harden the system so that ideally no one ever needs to look at it for another 10 years - it took about an hour, and cost a grand total of 4 american.... _cents_

I use Opus at work since we have a nearly unlimited AI budget, but for personal projects I just use GLM 5.3 and I don't see much difference between that and Opus.

liquicity•59m ago
Nice idea will watch though some - I made something similar but for food vids (filters over YouTube chefs - such as only vids with ingredients)

https://mealplannr.io/discover

privacyishuman•58m ago
I like this a lot. I was just thinking about a site where you could share your YouTube cookies and then use anybody's curated algorithm because you can curate it quite fast in signed out mode.

Could you block all the trackers from loading from https://www.youtube-nocookie.com on your side?

farrelle25•56m ago
What a great idea. Does anyone know of a way of 'getting' / downloading all those URLs (maybe with the video title)..? I'm afraid of the site disappearing.
karpathy•54m ago
The site won't disappear (imminently, as I'd like to use it personally!) but head over to the about/ section and download the .zip with the underlying data, which I put up for this purpose.
mentalgear•52m ago
Appreciate the effort, yet I think there is a place this is needed even more:

> It was Friday night at 11pm, I was tired, I went to YouTube to watch something and realized that I was looking at an enshittified wall of slop.

Please do the same thing on Social Media: Facebook, 'X', reddit, instagram, etc . Maybe find a 'hacker signal' that identifies quality content across those platforms and have them aggregated for the public so we don't have to spend time in the fascist network prisons.

The greatest trick - if it even can be pulled - would be setting it up in a way that it can't be sued out of existence by the angry platform overlords - if you can do this, then you are truly a genius, sir.

Free the people.

vfclists•51m ago
Where is the source, so I can roll my own specialized video site?
sejje•46m ago
Well, some portion of it was just served to you over HTTP.

It's very likely that your agents can just build the rest, if the backend source isn't provided.

farrelle25•37m ago
I think the core data is available here: https://hackertube.org/data
karpathy•30m ago
I didn't publish the server because it's a vibe coded mess, but if you point your Opus 5.5 at the zip and ask for YouTube-like site it will be basically instant. This part was like 3 min.

EDIT: one caveat is that i couldn't distribute the YouTube data so you'd have to create a (free) API key for that part. Luckily it's only ~1 min of hassle.

jumploops•51m ago
I’m always surprised how bad YouTube’s recommendation algorithm seems to be.

Maybe it’s because I don’t watch enough videos, but it’s sort of like Amazon, in that it will suggest the exact same content/topic.

I rarely use TikTok, only to view links people send me (similar to YouTube), but the recommended content is miles ahead, making it much more difficult to close compared to YT.

gleenn•49m ago
Do you have web activity turned off or use a separate old style Youtube account? Mine is also bad but I think it's because of those for me.
smokel•47m ago
I suspect they know perfectly well when they can't make money from someone, so they deliberately serve up boring crap to save on hosting costs.
thijson•46m ago
I was thinking it would be good if there was something similar for kids. They seem to fall into a whirlpool of trash content.
globular-toast•45m ago
Bad by what metric? They're interested in getting you to watch ads, they couldn't care less what you want.
renegat0x0•44m ago
For YouTube nerds I curate a list of channels. Size of list 3993 feeds: - https://github.com/rumca-js/awesome-database-top/blob/main/l...

From that list 731 are blocked in my rss feed. I do read and cache rest.

I sometimes check through website what new has entered the system. It is surprising to see something there new. It is so exiting to see something outside of my bubble.

YouTube algorithm has a lot to comb through, but I am too surprised how suggestion are bland, and unattractive. I am also surprised how difficult is to find new channels through YouTube search.

morphle•50m ago
Some of the Alan Kay lectures are on hackertube
gosen•49m ago
Nice idea, thanks Andrej! When will you add HackerTube Shorts? (kidding :D)
karpathy•24m ago
NEVER. More inclined to add HackerTube Longs :D
gosen•22m ago
yes! I'd love that :D
twalichiewicz•15m ago
You can make the ultimate anti-short attention span player by intercepting all keyboard/mouse inputs to prevent navigating away and requiring you to watch the whole video ◡.
sarmadgulzar•13m ago
You haven't posted on YouTube in a year or so. Working on any long-form videos we can expect to see anytime soon?

Anyway, loved your "GPT from scratch" video btw!

jahala•48m ago
This is great, would love filters for duration and sort by upload date
gpugreg•42m ago
Sorting would certainly be great. I'd especially welcome sorting by some kind of quality metric. The "thumbs down" count is not available via API anymore, but you could use thumbs up per views as a proxy, although that might require some reweighing, since videos with many views usually have fewer thumbs up.

You could also add another layer of voting on hackertube.org, so you'd get a more hackernews-focused voting signal.

karpathy•32m ago
added and pushed!
sejje•48m ago
> Media, journalism & propaganda

Amen, we should label it correctly more often. Hard to miss it nowadays, I guess.

gpugreg•45m ago
How do the categories work? I'd download the video transcripts and embed the text (maybe summarized first). This way you could support custom categories via embedding similarity.
mixtureoftakes•44m ago
I wish there was a way to sort by recency, if i'm mainly interested in finding obscure gems from like last 6 to 12 months of ai and tech updates
mtVessel•33m ago
Seconded! (please)
Aboutplants•32m ago
Yeah, this is the first thing I looked for and when I couldn’t find it I easily decided it’s something I would never come back to. Add this feature and it’s something I would come to frequently
karpathy•27m ago
added a few minutes ago!
kkotak•23m ago
Don't see it.
karpathy•20m ago
first do a search, then on top you'll see "Filter". might try to make more prominent from main page
macote•17m ago
Yes, please, I couldn't figure it out as well.
cromka•43m ago
I pay for YT premium but noticed the quality of recommendations is subpar yet I still end up wasting time watching it. So I decided I need to limit my feed to my subscribed videos only, which YT app makes annoyingly difficult.

How does HN handle this? I suppose downloading videos for consuming outside YT own app works, but what's the best solution for this, especially with Apple TV as a player?

aeriose•42m ago
YouTube constantly cycles the same content + videos it’s so annoying
nwmck•40m ago
I have an extension that blocks all recommendations and forces me to subscribe to the creators I like and search for content myself. Recommendations aren’t optimized for your benefit. Cutting out the recommendations really helps to not get sucked in.
0fflineuser•5m ago
Personnaly I disabled recommendations/watch history/etc... so the youtube homepage is blank, there is absolutely nothing on it.

I first started by moving all my subscriptions to grayjay(where I also disabled the home page), that way I just click the subscriptions tab and there is everything there, you can even create subscription groups if needed.

Then as I had some issues with grayjay desktop(not the mobile app which works great) I then simply moved all my subscriptions to miniflux and newsrafts(which I now rarely use). I use feedflow on android and reminiflux on desktop as I don't like the miniflux frontend. So now if there is a new channel I want to follow I just add the channel rss feed to miniflux/newsraft.

So for apple tv I guess you could use a RSS app but I am not sure the user experience would be great, so using grayjay could be an option as you can stream the video to the TV's but that would require another device (phone/computer) as it's not available on ios/apple tv.

I guess a good starting point would be to simply disable everything in your youtube settings to start off (watch history, recommandations, etc...).

iugtmkbdfil834•43m ago
I currently use downloaded and curated youtube videos on my local server ( mostly for my kid so that I don't have to deal with youtube autoplay or her clicking something kid would ), but this is just a reminder of much google has changed for the worse.
reorder9695•42m ago
I find it amazing how close the front page of this is to what I actually watch/want to watch on YouTube. I guess I shouldn't be surprised, but it feels like an unpersonalised feed (besides being based on Hacker News) shouldn't have a significantly better hitrate for me than YouTube's "personalised" feed.
rileymat2•8m ago
I am not sure the personalize algorithm is based on what you want to watch, but what will keep you watching. That’s a measurable KPI.
GodelNumbering•42m ago
This is such a good use of tech! Although I have heard in the past that youtube is quick to ban any use of its content on a third party site. I hope I am wrong and this stays.
beaconflint•42m ago
Recency sort needs a pick between comment date and upload date, since a 2012 talk linked last month is exactly the gem you'd want.
zahrevsky•42m ago
Do you plan to update the site with new videos and comments?
twalichiewicz•40m ago
Interesting project, but have you considered publishing the curated videos as automatically maintained playlists (organized by topic, popularity, or recency) on a YouTube channel?

To me the most valuable part of this is the curation pipeline. I'd love to have access to those recommendations without needing to adopt an entirely separate viewing experience.

karpathy•34m ago
I like the idea of playlists, might even work to ask Claude to make a few. Did you have in mind the ability to create and publish them on the site somehow?
twalichiewicz•25m ago
I was actually thinking of publishing them directly to YouTube, under a HackerTube channel, with playlists automatically generated and maintained by your existing curation pipeline.
waschl•25m ago
Having HackerTube videos as playlists inside YT makes the video selection available on any device with YouTube app on it, like TVs etc.
mhrmsn•39m ago
Interesting idea! Also funny that the fourth recommendation for me was a video with Andrej himself :D
kiuiras•38m ago
It would be great to have an option to sort videos by upload date, so it's easier to discover recent content.
ninjahawk1•38m ago
Really cool idea, you might consider bundling taps when you click a video so it auto-plays instead of opening up the native web browser for youtube. That would make it feel more like the official client. Could easily hide it behind a “buffering” screen.
ciefa•34m ago
Seeing Prejudice by Tim Minchin on the front page makes me very, very happy.

Love Tim Minchin <3

saikiran91•33m ago
I can't find it on GitHub. Is it open source?
furyofantares•31m ago
Remarkably the source is so small I can just post it here.

> Let's write our own YouTube clone based on whatever videos have been recommended on Hacker News.

rvz•30m ago
> Is it open source? If not, I'm not going to use it.

Don't even use GitHub then as that is also closed source as well as this.

mbed92•32m ago
Really cool idea. I also realized recently that whenever I enter YT, I enter "nshittified wall of slop"...
skyberrys•32m ago
What is a 50% thumbnail?
fasterik•30m ago
I'd never heard this term either, but I'm assuming it means that if the video is N frames long, it uses frame N/2 as the thumbnail.
karpathy•22m ago
correct. it means the thumbnail is sourced from exactly halfway in the video, so you get a representative frame.
waschl•18m ago
You may want to have a look at DeArrow https://dearrow.ajay.app/
karpathy•16m ago
The average thumbnail on YouTube these days is some guy looking like HOLY SHIT, tearing his hair in amazement looking at something with an arrow pointing at some detail. "TOP 10 XYZ. YOU'LL NEVER BELIEVE #6". Like and subscribe. Utterly repulsive.
aizk•32m ago
Nitpick, maybe adding the youtube dislike counter estimation for videos might be a nice touch (yes it's an estimate but it's pretty decent). Though on second thought, perhaps these videos don't need them.
flir•31m ago
I wonder how "spam and low grade content" is defined.

(I'll just put this https://www.youtube.com/watch?v=dv5Uk9UUx_M here)

Doohickey-d•28m ago
Someone did something similar for the current front page: https://hn.video

There was also another one with a more youtube-like UI, which I can't find anymore.

codingisfreedom•27m ago
Out of curiosity - was this created using claude code? Cli or gui? I am not even remotely getting that kind of thoroughness from claude with opus 5.5 or anything really. It seems to want to stop as soon as it thinks it figured things out and then the rest of the conversation is just itself saying that its previous claims were wrong.

Really having a bad time with LLMs lately.

wyre•21m ago
I haven't used CC in a while, but I would bet this is sol that made this.

however I still get the same issues with sol getting more apologetic and is more likely to stop working when i tell it is wrong, instead of fixing course and trudging ahead.

surround•19m ago
In the first paragraph Karpathy says he used Opus 5.5. The parent comment is asking if he used a different harness besides claude code.
macote•12m ago
Claude Code, I found it in About

> HackerTube was built by Claude Opus 5.5, Anthropic's AI model, working in Claude Code: the data pipeline, the search and recommendations, and this site.

mi_lk•20m ago
One of the better ones but in all honesty a random ass vibed site that's on front page because Karpathy
iugtmkbdfil834•19m ago
It is true and it is worth pointing out. Still, you have to admit that what he did here shows the distance of how easy it is to get from prompt to a working prototype if you have a clear idea of what you want to do (edit: his blog claims 3h.. which seems like a neat outcome if it includes gathering hn info from scratch ).
mwambua•20m ago
> I'm sure this algorithm works well for the median person on the internet, but it definitely does not work for me

I see this sentiment expressed a lot regarding a variety of ways the internet has been enshittified. Are we really sure the median person would prefer this to better content if they were presented with an alternative?

And even if they would - what are the ethics of knowingly feeding slop to the masses?

victor9000•19m ago
Could this not just be a playlist?
doginasuit•17m ago
You may want to change the logo, it is a different color but close enough to cause confusion. Not sure what a trademark court would say but it would definitely be enough to draw intimidation from Google if they wanted to.
karpathy•8m ago
ty i think this is right
sarmadgulzar•16m ago
Wow, this is genuinely so good. I just browsed it for a few minutes and the difference between this and the YouTube homepage is astounding.
gambiting•15m ago
>>Opus downloaded all comments of HackerNews

I'm actually surprised this was that easy to do, ngl

Flere-Imsaho•7m ago
What a smart idea!

Just randomly found this video from CGP Grey:

"What Happened to Horses Is Happening to Us"

https://hackertube.org/watch/7Pq-S557XQU

From...2014 It's surprisingly accurate. I wonder why he stopped making youtube videos.

mixtureoftakes•10m ago
thanks!