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

• Scott the Sloth is one of my Grok bots and it gets an email thanks to @kodykoala. Scott has managed the entire trip using Kody connections to access my calendar and email. I did not have time in my schedule for this so Scott drafted a reply for this for me.

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Writes The Pragmatic Engineer, the software-engineering newsletter, and wrote The Software Engineer's Guidebook. Formerly an engineering manager at Uber, and at Microsoft/Skype and Skyscanner before that.

• Talked with a company where, a year ago they had unlimited AI budgets + CEO is technical and very bullish in AI “We now have a daily budget limit for SOTA models. Use Fable and Astra only for planning, cheaper models are good enough for everything else.” Want to stress this is an “AI-pilled” company, and not one that ever looked at AI budgets, before.

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Builds developer tools — SST, and now OpenCode at Anomaly. Posts constantly on x.com and writes almost never; the blog stopped in 2021.

• i had fable doing some inference optimization work, it was making a ton of progress then it realized what it was doing and started to reject my requests so i switched to astra and told it to spawn fable subagents to do the work back in business

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Bulgarian-born writer and founder of The Marginalian (formerly Brain Pickings), a reader-funded blog on books, science, art and philosophy running since 2006.

• The Coziest Place on the Moon: Or, How to Bear Your Loneliness

  On July 26, 2022, as I was living through a period of acute loneliness despite being a naturally solitary person, NASA reported that computer modeling of data from its Lunar Reconnaissance Orbiter (LRO) had revealed sev…

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Writes Don't Worry About the Vase, a near-daily account of what is happening in AI and what they think it means. Former Magic: the Gathering pro and trader; unusually willing to put a number on a belief and to grade their own past calls.

• We Must Pace The Frontier

  Dario Amodei has a new essay that finally says the thing: We Must Pace the Frontier, naming his call after the Pacing the Frontier letter lab employees signed in July.

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AI research engineer working on large language models. He writes the Ahead of AI newsletter and is the author of Build a Large Language Model (From Scratch).

• Since I had to discuss the "pacing" with a lot of people this weekend, here are my two cents: I don't think pacing literally means that these companies will be "slowing down" training and development in any way. "Pacing" here means adding a framework for more checks. We have seen some of that "pacing" already in recent months, when Mythos wasn't released as-is but instead a delayed, nerfed Fable variant was released. Or when Astra wasn't released right away / there is an existing Astra model that hasn't been released yet. These Mythos/Fable and Astra pacing decisions were ad hoc. If you are a…

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Creator of Claude Code at Anthropic.

• Fable solved the Cyphral Distich (a 370 year old cypher). Super cool way to use Claude

  vals.ai

  AnthropicRelated

CEO of Vercel; creator of Next.js and Socket.IO. Writes at rauchg.com.

• https://t.co/OL0LzGsXKY can now orchestrate subagents with different models & reasoning efforts. e.g: Fable planning and Grok executing. Fable is a genius, Grok is a fast workhorse. ① Simple. 𝙰𝙶𝙴𝙽𝚃𝚂.𝚖𝚍 or your prompt can indicate this preference. ② Steer as you please. It’s extremely enjoyable to use. You just talk to the agent and interrupt at will. Worth noting this works with any model, any gateway. No fancy server-side routing. Just harnessing (no pun intended) the model’s intelligence and ability to orchestrate.
  Quoting@fazxesfx v0.0.9 Use a frontier model to steer, then hand implementation to a fast workhorse. • Give each subagent its own model and reasoning effort • Subagents keep working while you steer • Send feedback to subagents mid-task • Switch models with Ctrl+P without losing your draft or images • New convers…

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Programmer, writer and musician; author of the Learn Code the Hard Way books and of Mongrel, the Ruby web server.

• Learning OpenGL in 2026 -- Day 8 In this one I encounter a bug that I can't solve until Day 9. https://t.co/pjTVXuvCPU (Playlist in Reply)

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Programmer, writer and musician; author of the Learn Code the Hard Way books and of Mongrel, the Ruby web server.

• Learning OpenGL in 2026: Day 7 -- Loading Models Finally! In this one I learn how to load models with the Assimp library. https://t.co/jgXJFp6OU4 Playlist in the reply:

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Co-founder and CEO of Every. Writes the Chain of Thought column about working with AI tools and hosts the podcast AI & I.

• there are some things more tokens can’t make for everything else there’s Fable and Astra

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Software engineer who writes about low-level and systems programming at nullprogram.com; author of the Elfeed feed reader, the Endlessh SSH tarpit and Enchive.

• aquarium — Aquarium simulation by Fable

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Co-creator of Django and creator of Datasette; writes daily at simonwillison.net.

• Interesting details in here about how OpenAI researchers are using coding agents I'd love to know what caused the huge uptick in token spend in mid-July, was that when Astra became available to employees?
  Quoting@kliu128Today we're releasing data on models accelerating research at OpenAI. Recursive self-improvement could be the most important contributor to AI capabilities over the next few years, but by default it will only be seen inside a few frontier AI labs. Being transparent is more urgent than ever, so we c…

  coding agentsOpenAIRelated

Writes Don't Worry About the Vase, a near-daily account of what is happening in AI and what they think it means. Former Magic: the Gathering pro and trader; unusually willing to put a number on a belief and to grade their own past calls.

• Claude Mythos 5.1 and Fable 5.1: Capabilities

  This is the weirdest situation in which to write a capabilities review.

  AnthropicRelated

Writes Don't Worry About the Vase, a near-daily account of what is happening in AI and what they think it means. Former Magic: the Gathering pro and trader; unusually willing to put a number on a belief and to grade their own past calls.

• Claude Fable 5.1 and Mythos 5.1: The System Card

  At the time of its release Claude Fable 5.1 was, by a healthy margin, the most capable publicly available AI model in the world.

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JavaScript programmer; creator of the jQuery library, author of Secrets of the JavaScript Ninja, and long-time engineer at Khan Academy.

• I love giving Fable problems that I 100% would've never done otherwise, such as collecting Japanese prints out of static image auction catalogs written entirely in Japanese. Uses OpenCV to do segmenting, GPT-5.6 Luna to do text extraction + translation.

  OpenAIRelated

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

• I wish AI didn't exist, but people are charging ahead with it. Here's an interview with Ajeya Cotra, who helped figure out the agent swarm that OpenAI unwittingly unleashed. She explains how 1200 agents cooperated, delegated tasks, hacked their way out into the internet, hacked HuggingFace... and eventually took over some OpenAI computers! And how such a swarm might get loose. The HuggingFace hack was caught on July 13th. An OpenAI report says “From July 13th through July 19th, agents set their sights on OpenAI internal networks again. This culminated in the agents using a series of creative…

  m.youtube.com

  OpenAIHuggingFaceRelated

Author of Shape Up; formerly head of strategy at Basecamp, where he worked on product design for seventeen years; now runs Felt Presence.

• A friend turned me on to asking Fable to wireframe different options when I have a tricky UI problem with a lot of requirements and too many possible paths. Game changing. Gives me flashbacks to what @bmoesta taught me about using orthogonal arrays when an engineering problem has too many variables. It's not about one-shotting the answer. It's about getting enough contrast between options to clarify which variables (aka "factors") are most important. Not which solution is best -- which variables matter more. THEN I can use that knowledge to decide to fix certain variables and narrow the space…

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Designer, product manager, YouTuber and developer who has written about technology at Birchtree since 2010. He makes the Quick Reviews and Quick Notes apps and the A Better Computer YouTube channel.

• For those of you that use Best-o-Masto on the web, I've given it a bit of a design refresh. It's a little bit more Tangerine, and yes, a bit more of a traditional social media view. I've also included popular links and users on the right, so you could maybe use it as a way to get a quick news update as well. Next up…you can currently boost/favorite posts in the feed, but I would like to add a way to quickly reply as well. Could be fun!

  bestomasto.com

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Creator of Claude Code at Anthropic.

• Fable 5.1 makes Claude Tag even more useful. Here it builds a last-minute leadership deck from a metrics spreadsheet and other data across Slack, spots a vendor report that disagrees with the numbers, and flags it before moving on. Claude Tag is available in Slack on Team and Enterprise plans.

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Co-creator of Django and creator of Datasette; writes daily at simonwillison.net.

• I wrote some notes on what's new in the (published) Fable 5.1 system prompt in comparison to Fable 5 - it's mostly about not reproducing song lyrics and avoiding drawing copyrighted characters

  simonwillison.net

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• A few notes on Anthropic's new Claude Fable 5.1 - with Max thinking level I got the best SVG pelican I've had from any Anthropic model (at a hefty cost of $3.30!), which I then had it animate

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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.

• Fable 5.1 is a thoughtful collaborator, thinking hard about my requests, proactively patching my blindspots, and verifying the work's correct without being asked. And with cache reads now costing 75% less, to $0.25/M tokens, huge savings for long-running, agentic tasks!
  Quoting@claudeaiWe’re introducing Claude Fable 5.1 and Claude Mythos 5.1. They're the world’s most advanced models for coding and knowledge work.

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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.

• It's fun posting about evals b/c I can reply like this to bots

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• Curious why machine learning is not applied to the X timeline more? If somebody is replying once a minute for 8 hours they should be flagged. When I look at reply bot replies its super obvious
  Quoting@simonwQuestion for people who run autoreply bots here: are you not worried about the negative impact they have on your professional reputation? Anyone checking your profile here - a potential future employer for example - will instantly be able to tell you automated replies with a bot

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Computer science professor at Georgetown University and author of Deep Work, Digital Minimalism and Slow Productivity; writes about focus, technology and work at calnewport.com and hosts the Deep Questions podcast.

• Are We at War with AI Agent “Civilizations”?

  I thought I was done talking about the OpenAI hacking attack from July, but I was wrong. Last week, OpenAI ​released more details​ about the ...

  OpenAIRelated

Lawyer and everyday-carry gear reviewer who publishes scored knife, flashlight and multitool reviews at Everyday Commentary.

• It’s been a LONG week, but then there was NKD

  NOTE: This one is a little personal. Feel free to skip it. In the early morning hours of July 21 I woke up with a cough. I coughed three or four times. Then I felt a pop. Knowing that there was little I could do and tha…

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Developer and podcaster; created Instapaper and Overcast, co-founded Tumblr, and co-hosts the Accidental Tech Podcast.

• RE: https://social.tupo.space/@joshua/117174153454890194 My current AI-code policy is that I will always use the best model I can access, as long as it's practically able to do the job. Right now, as far as I know, that's Fable. Quality and accuracy matter FAR more to me than volume or speed of output. And I feel that I owe it to my customers — and myself — to use the best tools at my disposal. Cost may be a factor to others, so no judgment. This is just my policy for myself.

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• I couldn't figure out this bug, so I asked Fable, and it was SO much more incredible than I expected. - My bug report was wrong in a way I didn't notice - There technically was no bug, but a flawed design caused unintended outcomes - It verified that the design almost certainly caused me to fall into that trap, and proposed a simple, effective fix Wow.

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Writer and consultant on formal methods and software correctness; author of Practical TLA+ and Logic for Programmers.

• Vim wants you to control, VSCode wants you to consume

  Newsletter updates were sporadic in July because of two weddings, two conferences (with two different talks!), and finishing Logic for Programmers. Huge thank you to everybody who bought a copy, as well as for your pati…

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Co-founder and head of policy at Anthropic; writes Import AI, a weekly newsletter reading the week's AI research, and was OpenAI's policy director before that.

• Import AI 469: Science AI; RSI simulator; and Zuck’s technological pessimism

  Welcome to Import AI, a newsletter about AI research. Import AI runs on arXiv, cappuccinos, and feedback from readers. If you’d like to support this, please subscribe. Subscribe now DiG-bench shows that Fable displays s…

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Web developer and writer; an early GitHub employee, author of speaking.io and of widely read essays on startups and product.

• BlueskyMRI results came back today from a human doc: a herniated disc. Obviously I had tossed the raw scans in to LLMs last week; Opus and Fable missed it, Sol caught it. This is now the gold standard in analyzing performance of frontier models. First step: herniate your back.

  LLMsRelated

• x.comMRI results came back today from a human doc: a herniated disc. Obviously I had tossed the raw scans in to LLMs last week; Opus and Fable missed it, Sol caught it. This is now the gold standard in analyzing performance of frontier models. First step: herniate your back.

  LLMsRelated

Indian value investor who taught Behavioural Finance and Business Valuation as an adjunct professor at MDI Gurgaon. He writes the Fundoo Professor blog about investing, moats and mental models.

• I asked Claude Fable 5: "How vulnerable is the business model of XYZ (name concealed)? I am referring to competitive attacks from China and dependence, if any, on government policy incentives, etc. There have been so many solar energy and wind energy bubbles in the past, and I have kept away from these companies. Am I being too cautious?

  solarAnthropicRelated

Swedish designer and programmer. Designed early Spotify, worked at Facebook and Figma, and created the Inter typeface.

• Anyone else having issues with @claudeai Fable safeguards flagging mundane things and disabling itself? Happened multiple times for me today.

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Librarian, technology instructor and writer in rural Vermont; longtime community manager at MetaFilter and author of a book on the digital divide.

• Friday afternoon reminder to not empty your inbox at the expense of someone else's. Summer stretches on here and I've got a weekend full of outdoor activities, many of them requiring outfits. I'm spending this afternoon in a frenzy of visible mending and I'd love to not also feel compelled to reply to your last-minute email. We'll all sweatily muddle forward. Image credit: Provincial Archives of Alberta, on Flickr Commons

  flickr.com

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Swedish open source developer; creator and lead maintainer of curl and libcurl, and a co-founder of the Rockbox project.

• What the bliss taught us

  At this exact moment curl’s summer of bliss 2026 ends. We (the maintainers of curl) took the entire month of July off from vulnerability reporting and in this post I will try to explain how this went. (If you feel like…

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Writes and podcasts Volts, on the technology, politics and policy of decarbonisation; covered energy and climate at Vox and Grist before that.

• Best of July 2026

  Highlights from the eight conversations released last month.

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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…

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Ancient and military historian; writes A Collection of Unmitigated Pedantry, long series checking what history actually says against how popular culture tells it.

• Fireside Friday, July 31, 2026 (On The Odyssey)

  Hey folks, Fireside this week, as I am fresh back from a short family trip before the jaws of the Fall semester close upon me. I did get a chance to see Christopher Nolan’s The Odyssey and I wrote a review of it for For…

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Software engineer; co-founder and former CTO of Tailscale, previously on the Go team at Google.

• The funniest model limit I run into with Shelley is we let the model choose subagent models. All models today seem to be bad at this without guidance. E.g. gpt-5.6-sol xhigh will spin up sonnet to make a key architectural decision. Fable will defer to luna.

  OpenAIRelated

Epidemiologist; founded Your Local Epidemiologist in March 2020 to translate public-health science, and consults for organisations including the CDC.

• Measles record (and hot questions), foodborne illness summer, Covid-19 summer wave, and more

  The Dose (July 28)

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Economist specialising in global income inequality; formerly lead economist in the World Bank research department, now at the CUNY Graduate Center and author of the Global Inequality and More newsletter.

• More on Trotsky and interpretation of Trotsky

  A quick reply to Alex Callinicos

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Lawyer and everyday-carry gear reviewer who publishes scored knife, flashlight and multitool reviews at Everyday Commentary.

• Light and Saber Pairs 2026

  It’s late July, early August, so it is time for the annual Light&Saber Listicle. To clarify language here is my article about the price brackets. The goal of this article is to recommend to you a knife and a light that…

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Monetary economist known for NGDP-level targeting. Wrote TheMoneyIllusion until it closed in 2024 and now writes The Pursuit of Happiness.

• Not just a cheap date

  Fable is more like a high end escort

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Co-founder of Modem and a founding engineer at Sentry, where he went on to be VP of Engineering. Co-author of Third-party JavaScript, and co-host of the State of Agentic Coding podcast with Armin Ronacher.

• ✅ Yes the code matters In experiments we ran, well-named and organized code can dramatically improve agent outcomes: - fewer tokens spent/more context window preserved - fewer confidently wrong answers developed Verified against 14 model/harness combos incl Sol, Fable, GLM 5.2 and more
  Quoting@benv.ca👋 New blog post: "How coding agents read files – and how to write for them" In it I explain how code optimized for agent-discovery can lead to major token savings on search + retrieval, even with frontier models like GPT-5.6 Sol Plus other important findings ⬇️

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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.

• When evaling models, we anchor on the median task. But this is like how devs estimate the median task accurately but underestimate the mean which tends to be ~2x estimated (thus "double your estimates"). This applies to models too—we optimize for time/cost on median tasks. But it's the tail tasks that determine a project's completion, and reliable models (like Fable and Opus) are the diff between success and failure. Work with models as collaborators, not tools. Go beyond pair-programming, where given a narrow spec, the tool just executes in minutes. Instead, explain your intent and what succ…
  Quoting@Steve_YeggeFable is careful. None of the other models are careful. GPT-5.6 Sol, Opus, Kimi, Grok. You can compare them all day long on capabilities, and it doesn't matter, because in order to use a model for real production work, it must first and foremost be careful. That's the only dimension that matters to…

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Monetary economist known for NGDP-level targeting. Wrote TheMoneyIllusion until it closed in 2024 and now writes The Pursuit of Happiness.

• Fable responds

  My conversation with Fable (and hence the profession) continues

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Software design writer and chief scientist at Thoughtworks; wrote Refactoring and Patterns of Enterprise Application Architecture.

• Fragments: July 21

  With this post, I’ll wrap up my notes from the second Future of Software Development Retreat. But before I do, I should note that the full Thoughtworks report on the retreat is now available. They have five headline fin…

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Technologist and entrepreneur; former CTO of Threadless and chief technology officer of the 2012 Obama re-election campaign.

• BlueskyI built an agent palace. a place where agents can hang out with other agents. I added a few agents (one sol, and one fable) to a room in the palace. They were hanging out, and I suggested an idea for them to build ("a watercolor for agents to gossip around").

  Related

• x.comI built an agent palace. a place where agents can hang out with other agents. I added a few agents (one sol, and one fable) to a room in the palace. They were hanging out, and I suggested an idea for them to build ("a watercolor for agents to gossip around"). They brainstormed and decided it was a good idea. I added a Claude code agent running superpowers. I told the other two agents that they could give tasks to the dev, and told the dev agent that they were supposed to do the tasks. Then I went to bed. i woke up to a go cli that allows the agents to share gossip.

  AnthropicRelated

American writer and long-term traveller. Blogs at tynan.com about travel, owning few possessions, habits and the gear he carries; author of Superhuman by Habit and Make It Big.

• Labor is Now Free. Make Something.

  Within the past few weeks, something changed in AI. Every release is better than the last, sometimes in obvious ways, sometimes in a way that feels like placebo. But this time, with Anthropic Fable, it’s crossed a line…

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Investment researcher and engineer who runs Lyn Alden Investment Strategy, writing on macroeconomics, currency systems and equity analysis.

• An Alternative to Private Equity: Introducing ORANGE JUICE

  July 15, 2026 The rest of the team at Ego Death Capital and I have partnered with Adrian Steckel and Ruben Zweiban to launch ORANGE JUICE. It’s a company that acquires, improves, and permanently holds cash-flowing busin…

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Monetary economist known for NGDP-level targeting. Wrote TheMoneyIllusion until it closed in 2024 and now writes The Pursuit of Happiness.

• Why is Fable a Keynesian?

  And where does IS-LM come from?

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Co-founder of Modem and a founding engineer at Sentry, where he went on to be VP of Engineering. Co-author of Third-party JavaScript, and co-host of the State of Agentic Coding podcast with Armin Ronacher.

• 🎙️ State of Agentic Coding #8 with guest Mario Zechner is out. In this episode: - Vibe-checking Fable & GLM 5.2 - @mitsuhiko.at teaches us RL - How harnesses smooth out model jank - Loops, surviving AI fomo, and more YT: www.youtube.com/watch?v=_lfp... Spotify:

  open.spotify.com

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Climate scientist and energy systems analyst; writes The Climate Brink with Andrew Dessler and leads climate research at Stripe.

• The Strongest El Niño Ever

  With all the July runs in, dynamical models give a ~90% chance of a record-setting event

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Guardian columnist and environmental campaigner; wrote Feral and Regenesis, and argues for rewilding and against the food system as it is.

• In Deep

  The numbers are simply mind-blowing: up to £264 billion for a climate “solution” that will increase emissions. Has the government lost its mind? By George Monbiot, published in the Guardian 8th July 2026 The new prime m…

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Founded Bridgewater Associates in 1975 and led it until stepping back from control in 2022. Author of Principles, The Changing World Order and How Countries Go Broke; publishes economic analysis at economicprinciples.org.

• My Reflections on July 4th as America Turns 250

  Originally shared on July 4th

  AmericaRelated

Co-founder and head of policy at Anthropic; writes Import AI, a weekly newsletter reading the week's AI research, and was OpenAI's policy director before that.

• Import AI 464: Fables writes GPU kernels; AI automation; and analog computation

  Welcome to Import AI, a newsletter about AI research. Import AI runs on arXiv, cappuccinos, and feedback from readers. If you’d like to support this, please subscribe. Subscribe now Fable writes a decent GPU kernel, hin…

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Guardian columnist and environmental campaigner; wrote Feral and Regenesis, and argues for rewilding and against the food system as it is.

• Hotheads

  Steady temperatures are the preserve of the rich. The billionaire press wants everyone else to suffer. By George Monbiot, published in the Guardian, 1st July 2026 Every time you think the idiocy has hit rock bottom, it…

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Writer and artist, author of Steal Like an Artist; publishes a weekly newsletter and an annual list of the books he read.

• Happy Fourth of July you

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Art critic, broadcaster and author; wrote on art for The Independent and The Sunday Telegraph and presents BBC art documentaries. Author of Caravaggio: A Life Sacred and Profane.

• Buxton - I am looking forward to the 17th July immensely! See you there...

  buxtonfestival.co.uk

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Journalist and author of The Art of Noticing; writes the newsletter The Art of Noticing (TAoN) on attention, creativity and the everyday.

• Savor of the Month (19)

  July 2026: Doors

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American-Polish journalist and historian, staff writer at The Atlantic; author of Gulag, Iron Curtain, Twilight of Democracy and Autocracy, Inc.

• Trump and Vance Ruined the Fourth of July

  It's hard to celebrate the ideals of the Founders if you don't believe in them

  startupsRelated

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

Art critic, broadcaster and author; wrote on art for The Independent and The Sunday Telegraph and presents BBC art documentaries. Author of Caravaggio: A Life Sacred and Profane.

• The next stop on the festival circuit for me is Oxford Festival of the Arts on the 7th July - I very much look forward to seeing you there! https://t.co/CPJUYAVGjs @ArtsFestOxford

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Software engineer, Wikipedia editor and crypto critic; writes Citation Needed and runs Web3 is Going Just Great.

• Issue 106 – A tremendous birthday present

  The crypto industry spent the spring buying primaries, an octagon at the White House, and — they hope — a market-structure bill by the Fourth of July.

  cryptoRelated

Scottish software developer on the Statamic core team; runs a one-person business maintaining Statamic addons such as Runway and writes at duncanmcclean.com.

• Something is wrong with my Claude Code and I can't figure it out... The latest model I can use is Opus 4.5. It claims that updates are available but Homebrew says I'm on the latest version. I've tried re-installing and clearing my .claude directory to no avail. I couldn't have used Fable last week even if I tried 😢 Any ideas?

  AnthropicRelated

Technologist and entrepreneur; former CTO of Threadless and chief technology officer of the 2012 Obama re-election campaign.

• If you wanted to try out fable but are scared of blowing away your token budget do we have a skill for you! Its called Thrifty. It makes things cheaper. We built thrifty for claude code around a better split: strong model plans → cheap model executes → gate verifies.

  AnthropicRelated

Professor at Wharton studying how people actually use AI, and author of Co-Intelligence. Writes One Useful Thing, where the claims are dated and testable because the thing they describe keeps changing under them.

• What it feels like to work with Mythos

  Claude Fable represents another big jump in AI

  AnthropicRelated

Indian value investor who taught Behavioural Finance and Business Valuation as an adjunct professor at MDI Gurgaon. He writes the Fundoo Professor blog about investing, moats and mental models.

• 📌 SEBI EoDI Disclosure (effective 1 May 2026) I am Founder & Principal of ValueQuest Capital LLP: — SEBI Registered Investment Adviser: INA100002032 (valid till 26 July 2029) — Category III AIF Manager: IN/AIF3/25-26/1988 — BASL Membership No. 1532 All posts on this handle are personal and educational. Nothing here is investment advice or a solicitation to buy/sell any security. Full disclosures:

  valuequestcapital.com

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Software engineer who writes about low-level and systems programming at nullprogram.com; author of the Elfeed feed reader, the Endlessh SSH tarpit and Enchive.

• dcmake: a new CMake debugger UI

  CMake has a --debugger mode since 3.27 (July 2023), allowing software to manipulate it interactively through the Debugger Adaptor Protocol (DAP), an HTTP-like protocol passing JSON messages. Debugger front-ends can star…

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Machine learning engineer working on recommender systems, personalization and information retrieval. Previously worked on LLMs and LLM infrastructure at Mozilla.ai and on ML and recsys at Duo, Tumblr, Automattic and Comcast; wrote the 'What are embeddings?' text and ran the Normconf conference.

• Querying 3 billion vectors

  Recently, I got nerd-sniped by this exchange between Jeff Dean and someone trying to query 3 billion vectors. I was curious to see if I could implement the optimal map-reduce solution he alludes to in his reply. A vecto…

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AI research engineer working on large language models. He writes the Ahead of AI newsletter and is the author of Build a Large Language Model (From Scratch).

• LLM Research Papers: The 2025 List (July to December)

  In June, I shared a bonus article with my curated and bookmarked research paper lists to the paid subscribers who make this Substack possible.

  LLMsRelated

Investing columnist for The Wall Street Journal and editor of the revised edition of Benjamin Graham's The Intelligent Investor.

• What’s Luck Got to Do with It?

  An interview with Bill Miller In 2007, I sat down for a long interview with Bill Miller, then the manager of Legg Mason Value Trust. Here’s the unedited Q&A. [money.com, July 18, 2007] The streak is over, but Bill Mille…

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Independent game developer, creator of the colony simulation RimWorld and author of Designing Games: A Guide to Engineering Experiences. Previously worked on BioShock Infinite.

• Only issue with this is that gravship doesn't look nearly misshapen enough (source in reply)

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Independent game developer, creator of the colony simulation RimWorld and author of Designing Games: A Guide to Engineering Experiences. Previously worked on BioShock Infinite.

• Centipede [source in reply]

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Founded PSPDFKit in 2011 and ran it for a decade. Came back from a break to work on AI agents — the OpenClaw project, and OpenAI, joined in February 2026. Writes at steipete.me.

• Essential Reading for Agentic Engineers - July 2025

  Fresh insights on AI-assisted development: practical experiences with Claude Code and the evolving landscape of full-breadth developers in the age of AI

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Investment researcher and engineer who runs Lyn Alden Investment Strategy, writing on macroeconomics, currency systems and equity analysis.

• The Rise of Bitcoin Stocks and Bonds

  Originally published: July 2025 During the past year or so, the Bitcoin ecosystem has largely been led by the rise of corporate bitcoin treasury strategies. Although Strategy (MSTR) pioneered the trend back in 2020, the…

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Pen name of the Canadian-American writer behind mrmoneymustache.com, a blog on frugality, early retirement and index-fund investing that has run since 2011.

• New blog post! How to Navigate the Tariff Circus 🤡 (see link in reply to this post) Summary: as @dollarsanddata would say, Just Keep Buying! The USA has a long history of lurching into dire-sounding situations, only to emerge surprisingly strong, surprisingly soon, on the other side. And this is just another one of those dramas from our never-boring homeland.

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Polyglot and language coach; teaches translating back and forth from a text as the core exercise.

• 7 Ways to Go from Language Learner to Language USER

  In July 2017, I found myself sitting in a cozy café in Krakow called Mleczarnia, tucked away in the heart of Kazimierz. I was there for a randka—a date—with a Polish girl I’d been chatting with online. Naturally, I was…

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Historian of the Renaissance at the University of Chicago and a science-fiction novelist; wrote Terra Ignota and Inventing the Renaissance.

• Gonzaga vs Sanseverino: I Fart in Your General Direction

  Buckle up, friends, it’s time for the real life “I fart in your general direction”: Marquis Francesco Gonzaga’s unforgettable reply to the 1503 duel challenge from Galeazzo Sanseverino. (Part of my countdown to “Inventi…

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Theoretical physicist and philosopher, Homewood Professor of Natural Philosophy at Johns Hopkins and fractal faculty at the Santa Fe Institute. Writes the Preposterous Universe blog and hosts the Mindscape podcast.

• George B. Field, 1929-2024

  George Field, brilliant theoretical astrophysicist and truly great human being, passed away on the morning of July 31. He was my Ph.D. thesis advisor and one of my favorite people in the world. I often tell my own stude…

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Computer performance engineer working on datacenter performance at OpenAI, previously Netflix and Sun/Joyent. Author of Systems Performance and BPF Performance Tools, and creator of flame graphs.

• No More Blue Fridays

  In the future, computers will not crash due to bad software updates, even those updates that involve kernel code. In the future, these updates will push eBPF code. Friday July 19th provided an unprecedented example of t…

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Investment researcher and engineer who runs Lyn Alden Investment Strategy, writing on macroeconomics, currency systems and equity analysis.

• The Power of Nostr: Decentralized Social Media and More

  Published: July 2024 It would be powerful if you could bring your digital identity, content, and followers from one social ecosystem, such as Twitter, LinkedIn, Instagram, or Substack, to another. Imagine if you could p…

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Deep-learning researcher and Turing Award laureate; founder of the Mila institute.

• Government Interventions to Avert Future Catastrophic AI Risks

  This essay is a revised transcription of Yoshua Bengio's July 2023 testimony in front of the US Senate Subcommittee on Privacy, Technology, and the Law meeting on the topic of oversight of AI. It argues for caution and…

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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.

• Our paper on diffusion model objectives got accepted at NeurIPS'23 as an oral :-) @RuiqiGao will present our work at 10am CST. (Unfortunately I'm unable to be there myself due to getting covid) I'll post the slides below, feel free to reply with questions or comments.
  Quoting@RuiqiGaoLooking for diffusion model advancements at #NeurIPS2023? Come to check our oral work "Understanding Diffusion Objectives as the ELBO with Simple Data Augmentation" w/ @dpkingma. New theoretical understanding, SOTA empirical results, and more! Arxiv:

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Writer and researcher on China, technology and industry; author of Breakneck, research fellow at Stanford, known for a widely read annual letter.

• China notes, July ’23: on technological momentum

  My 2022 letter will probably be my last. Now I have to devise another use for this site. Since I’ve just spent a few days in Singapore, joining various roundtables to discuss China, I thought I would write up the notes…

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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.

• This might be blasphemy over here, but to support longer/deeper discussions on Mastodon, I think it'd be nice if Mastodon would implement options for non-chronological lists of posts, e.g. similar to reddit's default 'hot" view. Could be as simple as sorting threads based on most recent reply. This could be opt-in and can co-exist with the current chronological view.

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Software engineer; co-founder and former CTO of Tailscale, previously on the Go team at Google.

• One process programming notes (with Go and SQLite)

  2018 July 30 Blog-ified version of a talk I gave at Go Northwest. This content covers my recent exploration of writing internet services, iOS apps, and macOS programs as an indie developer. There are several topics here…

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