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Writes The Diff, a newsletter on inflections in finance and tech read by hedge fund managers, founders and VCs. Previously worked in finance at SAC Capital/Point72.

• Longreads + Open Thread

  Zuck, New Guinea, Time, Trash, Bugs, Japanese Warrants, Globalization

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Software engineer and educator; creator of Testing Library and of the EpicWeb.dev and EpicReact.dev courses.

• You can now easily use Jev in @kodykoala: https://t.co/9wowF8KzV9 You can use this when you need typed decisions fast: - An inbox floods in and you need to know which messages are actionable, which can wait, and which are noise. - A support thread arrives and you want the right team, an urgency score, and whether to escalate in one pass. - You're checking a refund against order and policy text and need a clear yes/no with confidence. - Chat or tickets mix bugs, feature asks, and banter; you want a label and whether there’s enough detail to file an issue. - Alerts keep firing and you need “rea…

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Mathematical physicist at UC Riverside. Wrote This Week's Finds in Mathematical Physics and now the Azimuth blog on mathematics, physics and environmental science.

• The social scene around AI and AI safety is more unpleasant than I realized. I'm sure there are other sides to it. But when you get a lot of men with too much money who think they're saving the world, surrounded by groupies, what do you expect? Read the long Bluesky thread about this, collected on one page: https://skywriter.blue/@segyges.bsky.social/3mvom4b4dn22q I can't confirm this stuff - I stay far away from this scene. And the sentence "AI Safety is Mostly a Sex Cult" is a massive exaggeration. But... (1/n)

  AI alignmentRelated

Science fiction novelist, journalist and technology activist; writes the daily blog and newsletter Pluralistic, and coined the term enshittification.

• Today's threads (a thread) Inside: Textured; and more! Archived at: https://pluralistic.net/2026/09/18/surprise/ #Pluralistic 1/

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• I'm going to come right out and say it: statistical extrapolation is *fine*. One of the most useful ways to understand the present and anticipate the future is to measure the things that happened in the past, find the correlations among them, and extrapolate likely future outcomes from those correlations. - If you'd like an essay-formatted version of this thread to read/share, here's a link to it on pluralistic.net, my surveillance-free, ad-free, tracker-free blog: https://pluralistic.net/2026/09/18/surprise/#wow-signal 1/

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Co-founder and CEO of Shopify; long-time Linux user and Omarchy contributor.

• Quote tweeting this thread by Andrew for more visibility.
  Quoting@DrewchI'm realizing from the flywheel thread from @tobi that many people don't realize that small models can actually outperform larger models on a specific task - @MParakhin has been saying this for quite some time. 🧵

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Co-founder and CTO of Honeycomb; previously an infrastructure engineer at Parse, Facebook and Linden Lab, and co-author of Observability Engineering.

• This guy runs a podcast. It's his six year anniversary. So he asks ChatGPT who he should have on and why, and then he does a thread tagging people like me @kentbeck, @lethain, etc with the reasons. This is a great example of something I just wrote about:

  charity.wtf

  Quoting@onejasonknight@mipsytipsy - you should come on One Knight in Product to talk about AI mandates, engineering productivity, management and what happens when coding gets cheap. It'd work because you have strong opinions and seem entirely comfortable having someone poke at them.

  OpenAIRelated

Former options market maker who writes Moontower, a newsletter on trading, volatility, decision-making and how to think about risk outside markets too.

• 2 polls in this thread
  Quoting@KrisAbdelmessihBonus question: What's your market on what percentage of the responses are the right answer

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Co-founder and CTO of Honeycomb; previously an infrastructure engineer at Parse, Facebook and Linden Lab, and co-author of Observability Engineering.

• Ah, I miss live tweeted recaps from the glory days of tech twitter! Here's a thread of my LDX3 talk, "what handcrafted servers taught us about handcrafted code". Thanks, Heidi!!! With a hat tip to @chadfowler.com, whose book "Regenerative Software" is now in O'Reilly prerelease.
  Quoting@wiredferret.bsky.socialNext talk at @LDX3NYC - @charity.wtf What hand-crafted servers taught us about hand-coded code Until recently, we were obsessed with code readability and understandability, because good code was rare and expensive. So your ability to understand code gates the change.

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Security engineer; founder of Matasano Security and Latacora.

• If you follow this thread down, it turns out there's only two beliefs you can hold: the p(doom) EA/Rat machine god theory, or Atlantean soul trauma. Those are the two options. I guess... I'm an Atlantean now? 🔱
  Quoting@bcantrill"I would appreciate it if you used less broad brushstrokes", says the person claiming that AI could kill all humans

  AI alignmentTraumaRelated

Programmer and technology writer known for his long Mac OS X reviews at Ars Technica; co-hosts the Accidental Tech Podcast and Hypercritical.

• After being bounced back and forth multiple times between regular Apple support and Apple Developer support, both claiming that this is the other party's problem to solve, I am now looking for anyone at Apple who can put me in touch with the folks that control the system that "locks" Apple Accounts for security reasons. The Apple Account locking system is a thing that exists! Someone controls/manages it! Please let me talk to them! See this thread for context:

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Writer and developer; runs Waxy.org, co-organises the XOXO festival, and was the first CTO of Kickstarter.

• I Found Evidence Of My House Spinning — creepypasta in the form of a forum thread, don't miss the "what's new!" at the very end

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Computer science professor who works on fast data processing; co-author of the simdjson parser and a weekly blogger about software performance since 2004.

• Apple design its own chips for its phones. The latest CPU is the A20 Pro. Geekbench is a benchmark with a database of results; you can run your own benchmarks and share your numbers with the world. In the last few days, we finally got some A20 Pro results and the numbers are impressive... reaching 4000 in single-core (one thread) performance. For comparison, the best that you can do with an x64 AMD or Intel processor is something like the Ryzen 9 9950X3D2 at about 3,163 which would be somewhere between the A18 and A19. The A20 Pro is 25% faster on this benchmark than any AMD or Intel processo…

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Essayist; writes Astral Codex Ten, previously Slate Star Codex.

• Open Thread 451

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Machine learning engineer and independent AI consultant. He writes about LLM evaluation, tooling and applied ML at hamel.dev, and previously worked on machine learning at GitHub.

• 🌶️Codex can do a anything Muse, Bot etc can do quite easily I get the appeal in the form factor “less is more” but if you are already a codex desktop and are a power user (computer use, remote access, thread management, voice control etc), YAGNI I still like playing with the other things for educational purposes but also need to avoid tool sprawl unless there is a real benefit

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Writes The Diff, a newsletter on inflections in finance and tech read by hedge fund managers, founders and VCs. Previously worked in finance at SAC Capital/Point72.

• Longreads + Open Thread

  Emerging Markets, Wishful Thinking, AI Detectors, Growth, 9/11, Rates, Quotes

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Computer science professor who works on fast data processing; co-author of the simdjson parser and a weekly blogger about software performance since 2004.

• A quick overview of atomics in C

  If you write in C, by default, you use a single thread. Extra cores do not help until you create more threads. However, if you include the header , you can pass a function to thrd_create, and wait for it with thrd_join.…

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Creator of the Keras deep-learning library and the ARC-AGI benchmark.

• Terence Tao just posted this really insightful thread which seems to have been written in reaction to the Navier Stokes announcement. Please give it a read.

  mathstodon.xyz

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Essayist; writes Astral Codex Ten, previously Slate Star Codex.

• Open Thread 450

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Writes The Diff, a newsletter on inflections in finance and tech read by hedge fund managers, founders and VCs. Previously worked in finance at SAC Capital/Point72.

• Longreads + Open Thread

  Loans, Aztecs, Robotics, Research Fraud, Moritz, Resorts International, The AI Trade, Cohn

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Software developer and entrepreneur; co-founder of Heroku, author of The Twelve-Factor App, and a researcher at Ink & Switch.

• Interesting thread about place names on Google Maps and international law
  Quoting@twlldun.bsky.socialFWIW I am *pretty* sure (I haven’t checked but I’m sure it is the case) that Google maps labels The Falkland Islands as Las Malvinas in Argentina and that’s fine because that’s what they are officially known as in Argentina so I don’t understand everyone’s position here

  GoogleRelated

Essayist; writes Astral Codex Ten, previously Slate Star Codex.

• Open Thread 449

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Creator of Flask and Jinja. Writes about software at lucumr.pocoo.org.

• procspawn — like thread::spawn but for processes

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Investor and writer. Previously a partner at Andreessen Horowitz and a product leader at Twitter, Facebook, Snap and Microsoft. Writes essays and memos at sriramk.com.

• everyone should go read @dwarkesh_sp’s post - it does a great job of laying out the timeline and what we know ( and don’t know) I do have two issues with it A) the use of anthropomorphic language. These are not civilizations nor do they have desires just like a CPU thread or a bunch of programs don’t. this doesn’t mean we downplay the importance of this moment for cyber - but using human parallels for what I believe is code is dangerous territory. B) IMO it gets the impact of open source models wrong and is unreasonably dismissive for reasons that are not clear. As @ClementDelangue highlights…

  open sourceRelated

Writes The Diff, a newsletter on inflections in finance and tech read by hedge fund managers, founders and VCs. Previously worked in finance at SAC Capital/Point72.

• Longreads + Open Thread

  SPR, Speed, Driving, Learning, USV, Diversification, Financial Engineering, Rickover

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Essayist; writes Astral Codex Ten, previously Slate Star Codex.

• Hidden Open Thread 448.5

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Co-founder and CTO of Oxide Computer Company. Created DTrace at Sun Microsystems and was CTO of Joyent; blogs about systems software, open source and engineering culture.

• A really interesting thread generally from @swtch.com -- and fascinating to watch Claude (correctly) do the archaeology. Confession: Claude's inability to verify www.illumos.org/issues/4627 (which it correctly identified as the bug) has me questioning the anti-bot provisions on the bug database...
  Quoting@swtch.comGo issue #78438 was another net/http test flake. This one turned out to be Go tripping over a Solaris kernel bug that predates the Illumos fork. @bcantrill.bsky.social fixed it in 2014! Hurry up, Oracle! research.swtch.com/agentlogs/so...

  AnthropicRelated

Programmer; makes Handmade Hero and teaches Performance-Aware Programming, and argues loudly about how software got slow.

• Q&A #87 (2026-08-25)

  Answers to questions from the last Q&A thread.

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Essayist; writes Astral Codex Ten, previously Slate Star Codex.

• Open Thread 448

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Psychiatrist and clinical assistant professor at Case Western Reserve University. Writes Psychiatry at the Margins on the philosophical and scientific arguments inside psychiatry and the psy-sciences.

• Good thread. I explored the visibility/invisibility aspect of things in a recent post with a thought experiment about “invisible” obesity:

  psychiatrymargins.com

  Quoting@StevenShorrockMany “invisible” conditions are simply impossible for clinicians to imagine. I believe 1 of 3 things are necessary: 1) deep specialisation+high empathic ability 2) general training + personally diagnosed 3) general training+cohab. family member experience+high empathic ability

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Data scientist and machine-learning researcher; chief scientist at bitly, founder of Fast Forward Labs and Hidden Door.

• This thread helped me understand that the outrage about Anthropic's watermarking is the confluence of a lack of understanding of how LLMs (or any statistical language model) works and general angst at the current economics.
  Quoting@hern.bsky.socialIf you use Claude right now, then it doesn’t pick the “best” word for a sentence. It creates a distribution of possible words, assesses the probability of any given word fitting the slot, and randomly picks between them based on that probability.

  LLMsAnthropicRelated

Interactive fiction author and hacker; wrote Spider and Web and Hadean Lands, and designed the Glulx virtual machine.

• NecronomiCon now labels itself as “The International Conference and Festival of Weird Fiction, Art, and Academia”, no longer a Lovecraft con specifically. And that is fair; the next panel I’m going to is “weird Appalachiana.” But Lovecraft sure does seem to be still the anchor and common thread.

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Front-end developer and writer; co-founder of CodePen, founder of CSS-Tricks, and co-host of the ShopTalk Show podcast.

• Clips from Hacker News Thread Instead of our real launch blog post, my little "I should probably mention this on my personal website"...

  chriscoyier.net

  personal websitesRelated

China economy researcher based in Beijing who writes on his personal blog about Chinese political economy, history, books and music.

• Real talk about the exchange rate

  (This post reproduces a thread I wrote on Twitter/X on July 29.) A lot of the discussion about the depreciation of/undervaluation of China’s real effective exchange rate takes for granted that this is about the currency…

  ChinaRelated

Writer of the newsletter bookbear express, on psychology, relationships, non-attachment and taste; based in San Francisco.

• we were girls together

  I saw a daddy longlegs on the ceiling while I was showering and didn’t panic, even when it started slowly descending in my direction on an invisible silken thread.

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FreeBSD developer and former FreeBSD Security Officer; founder of the Tarsnap online backup service and author of the scrypt key derivation function.

• Patrick's thread is about customer service, but I've run into the same phenomenon with Amazon. The modal scenario is "lossy internal communication results in a fix shipping which does not align with the original bug report".
  Quoting@patio11Ruriko and I, discussing how to help a third party: Ruriko: Oh you should call customer service for them. Me: It is because I want to help that I will not call customer service. I will write for them. Ruriko: Phone much faster and you can get company to agree on resolution.

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Member of technical staff at Anthropic. He has led ML/AI teams at Amazon, Alibaba and Lazada, and writes about LLMs, recommender systems and engineering at eugeneyan.com.

• I've been loving the multiplayer form factor of Claude Tag. Now others can reply on the thread to provide context and direction to Claude!
  Quoting@claudeaiIntroducing Claude Tag, a new way for teams to work with Claude. In Slack, Claude joins as a team member with access to the channels and tools you choose. Tag Claude in and delegate tasks to it while you focus on other work.

  AnthropicRelated

Programmer; makes Handmade Hero and teaches Performance-Aware Programming, and argues loudly about how software got slow.

• Q&A #86 (2026-06-10)

  Answers to questions from the last Q&A thread.

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Mathematician and Senior Lecturer in the Mathematics department at Columbia University. Author of the book Not Even Wrong and of the long-running physics blog of the same name.

• The First AI QFT Textbook

  The first surprise of this afternoon was finally finding an informed and sensible discussion of the implications of AI agents for hep-th research, in the form of a twitter thread by stringking42069. The second was learn…

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Writes Stratechery, a subscription newsletter on the business and strategy of technology, and hosts the Dithering and Sharp Tech podcasts.

• I’m gonna delete this thread because I think people complaining about airlines on Twitter are pretty lame, including myself! That said, I think the takeaway is that the reason I was upset is precisely because of dashed expectations. If this were American I would have shrugged my shoulders. So I guess that’s a compliment to United, but also a reminder that it’s risky to advertise things (like Starlink) when you can’t yet confidently deliver on them. Anyhow, 28B on Southwest. Let’s go! 😅

  AmericaRelated

Computer scientist and director of the MIT Digital Currency Initiative; her research covers distributed systems, databases and digital currency.

• interesting thread on currency history and what might be in store with the yuandollar
  Quoting@izakaminska🏴‍☠️1/ If what I think is happening is really happening, then I can make some predictions. Especially about incoming European problems. But first an important side story, which also relates to the “special relationship”. What a lot of people don’t know is that when Minos Zombanakis, the father of…

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London-based front-end architect, web developer evangelist and cloud consultant; Microsoft MVP. Writes at praveen.science and answers on Stack Overflow.

• Just checked in at #GitHub Social Club #London! 😎 🎟️ Lanyard secured, vibes already immaculate! ✨ Devs, builders & creators all in one spot… 📍 This is gonna be GOOD! 🚀 Oh and we’ve got @viola_idncod here! 💪🏻🤩 Here’s a thread! 🧵 #DevCommunity #LondonTech #BuildInPublic

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Writes Nintil, long researched essays on metascience, biology, economics and whatever he has decided to read the literature on.

• Links (94)

  Bacteria isolated from japanese tree frogs shown to work better in mice against cancer than doxorubicin or checkpoint inhibitors CAR-T to treat cardiovascular disease New proteomics clock, I wrote a brief thread with so…

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Mac and iOS developer; founder of Red Sweater Software (MarsEdit, FastScripts) and co-host of the Core Intuition podcast.

• I got sucked into an anti-trans thread rooted in one of @jk_rowling's utterly deplorable, obsessive takes on trans people. So many people are worried about trans women seeing cis women undressing. Why aren't they equally worried about any person seeing another person undressing?

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Research scientist at Anthropic; co-creator of the Variational Autoencoder and, with Jimmy Ba, of the Adam optimizer, two of the most widely used tools in deep learning.

• 👇 Great work led by Yushun (@ericzhang0410) introducing Adam-mini, a version of Adam that, surprisingly, reduces Adam's memory requirement by 50% (!), without negatively affecting convergence rates. Please read Yushun's thread for details!
  Quoting@yushun_zzzFinally finished Adam-mini! A "mini" version of Adam that painlessly frees 50% of memory over Adam. Some highlighted features: 1. Adam-mini saves 50% memory over Adam for all modern neural nets. This is done by removing 99.9% Adam's v (but the last 0.1% of v is essential and necessary). 2. Adam-min…

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Programmer and author of Modern C++ Design and The D Programming Language; a lead contributor to the D language.

• Me: "Explain your thread hierarchy design like I'm 5." Coworker (without missing a beat): "So, Daddy needs to run some threads, and..."

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