The Ledger
Every statement that passed quotation and attribution checks. Mix any filter with any other: certainty 1/5, debate potential 5/5, or both at once.
why aren't all 52 resolved? a statement only gets an assessment when the public record can support or contradict it. opinions and what-ifs never can, and 1 checkable ones are still open, waiting for their date. predictions held up or didn't; assertions are supported or contradicted. on every card: ▮▮▮▮▮ certainty · ▮▮▮▮▮ debate potential. speakers are clickable
Cherny: Bun codebase was rewritten to Rust in 11 days using Claude
“And he had the model rewrite it from Zig to Rust. It was one prompt. It was a dynamic workflow, and a dynamic workflows are a feature in quad code that essentially let you orchestrate, you know, dozens, 100,000 of agents to do work productively. And it ran for…”
Cherny uninstalled his IDE and lands 20 AI-written PRs daily
“For me personally, it's been a hundred percent for like since Opus 4.5. I just, I uninstalled my IDE. I don't edit a single line of code by hand. It's just a hundred percent quad code in Opus. And you know, I land, you know, like 20 pairs a day, every day.”
Claude Code increased Anthropic engineer productivity by 150 percent
“And since Quad Code came out, productivity per engineer at Anthropic has grown a 150%.”
Cherny: Claude Opus 5 Can Run Autonomously for Months Without Scaffolding
“For five, one example of something it does that I think no other model has done is it runs for a very long period of time. And especially when you combine Opus Five with auto mode, it's just like incredible. Like it can go for days, weeks, months at a time. It…”
Friedman: Tan replicated years of startup work in two weeks using Claude
“I feel like your real feel the AGI moment, Gary, was like getting Claude Code to build basically an entire startup for you, like replicating years of work of your previous startup in like two weeks, which is like insane.”
Claude Code's plugin feature was built entirely by an autonomous swarm
“I think the first kind of big example where it worked is our plugins feature was entirely built by a swarm over, over a weekend. It just ran for like a few days. There wasn't really human intervention and plugins is pretty much in the form that it was when it …”
Delete oversized CLAUDE.md files and start fresh rather than compacting them
“If you hit this, my recommendation would be delete your QuadMD and just start fresh.”
Garry Tan grants Claude Code direct access to his production database
“I mean, I'm not sure if I'm supposed to do this, but I've actually also had it access my production database.”
Cherny: Only Add System Prompt Instructions When Models Repeatedly Stumble
“The thing that you want to do is you want to run it. And if it's like a custom agentic product that you're building, you want to kind of run the products. You want to see where it fails with the model. You want to see what it does well. If you're using quad co…”
Cherny: Claude Code Users Should Delete CLAUDE.md Scaffolding Every Six Months
“Every six months, delete your Cloud MD. Delete your skills. Delete your hooks. See what the model does, and it might surprise you. And actually for Opus Five, this is something we really do recommend, is just try deleting all of these things, because the model…”
Anthropic Deleted 80% of Claude Code System Prompt for Opus 5
“So yeah, we deleted 80% of the system prompt.”
Cherny: Claude Code runs in production on Bun's AI-rewritten Rust codebase
“This is in production now. This is what quad code uses now when you're running it.”
Tan: Building Garry's List with Claude Code took $200 and five days
“The first time it took about, you know, four million dollars and, you know, six or seven people and about a year and a half. And then the second time it, you know, took about, I don't know, a hundred grand and two people, me and my co-founder Brett Gibson, who…”
Tan: Claude models are very good but not the smartest
“Claude Code is ideal for the ADHD CEO, but once in a while, there's a, you know, Claude Code will just BS a bunch of stuff, like Claude models are very, very good, but like, they are not the smartest, it turns out.”
Anthropic built the Claude desktop app in 10 days using AI
“And they built it in, I think something like 10 days. It was just like a hundred percent written by quad code.”
NASA JPL used Claude Code to navigate the Perseverance Mars rover
“It plotted the course for perseverance, like for like the Mars Rover.”
Claude Code stayed a CLI because graphical UIs obsolete too quickly
“And really, I think that's why we stayed in the CLI is because we felt there is no UI we could build that would still be relevant in six months because the model was improving so quickly.”
Claude Code autonomously messages Anthropic engineers on Slack via git blame
“A really common pattern is I ask claw to build something. It'll look in the code base. It'll see some engineer touch something in the git flame and then it'll message that engineer on Slack. Just like asking a clarifying question. And then once it gets the ans…”
SemiAnalysis reports Claude Code generates four percent of all public commits
“There were some other stuff from like semi-analysis that four percent of all public commits are made by quad code.”
Claude Code enables building 20 UI prototypes in a few hours
“You can write these prototypes and you can just do like 20 prototypes back to back, see which one you like, and then ship that, and the whole thing takes maybe a couple hours. Whereas in the past, what you would have had to do is like learn to use origami or f…”
No code in the Claude Code codebase is over six months old
“All of CloudCode has just been written and rewritten and rewritten and rewritten over and over and over. We unship tools every couple weeks. We add new tools every couple weeks. There's no part of CloudCode that was around six months ago. It's just constantly …”
Garry Tan: Claude Code can debug nested delayed jobs five levels deep
“Oh my God, like this thing can debug nested delayed jobs, like five levels in and figure out what the bug was and then write a test for it. And it never happens again.”
French-Owen: Claude Code and Codex Use Grep Rather Than Semantic Embeddings
“Like I think cursor takes an approach where they actually do semantic search, where they embed everything and figure out like, Hey, what query is closest to this? If you look at a codex or a cloud code they actually just use like grep.”
French-Owen: Context window limits remain the primary bottleneck for coding agents
“I mean, I still think context window is like probably the number one limit. Like if you look at cloud code executing, it's delegating to all these different context windows. At the end of the day, when each one comes back, it's like getting some sort of summar…”
French-Owen: Claude Code Succeeds by Distancing Devs From Low-Level Code
“And I think it's important actually to quad code that it's not an IDE because it sort of distances you from the code that's being written. Like IDEs are all about exploring files, right? And you're like trying to keep all the state in your head and understand …”
Tan: Developers adopt vendors like PostHog simply because Claude Code recommends them
“Now people are probably just making Architecture decisions about what to use directly in CloudCode. Like, they might not even know what, you know, what analytics to use. And it's like, oh yeah, as long as CloudCode says use PostHog, like, they're using PostHog…”
Garry Tan: Claude Code enables one person to do five people's daily work
“It's like, I can do five people's worth of work in like a single day. It's like rocket boosters.”
Srinivas: Claude Code appears to be far smarter than Cursor
“Claude code seems to be far smarter than, like, what Cursor is able to do.”
Cherny: Prompt modern models with high-level guardrails, not micromanaged steps
“And for modern models, that's actually really not the way to do it. You want to go a little bit higher level. You want to describe the task. You want to describe the guardrails. You want to describe, like, the exit criteria, and then just go with the model coo…”
Cherny: Claude Code uses Bun sandboxes to orchestrate dynamic agent workflows
“What a dynamic workflow is, is essentially we have the Bun runtime. We use Bun as a sandbox, and we start a virtual machine within Bun, and we let Cloud start a lot of agents and orchestrate them.”
Huang: NVIDIA engineers use autonomous coding agents like Claude Code and Cursor
“We've got cloud code autonomously running in sandboxes all over NVIDIA, and that's really fantastic, and some people use codex, some people use cloud code, some people use cursor, some people use cognition, and we let kind of a thousand flowers bloom, let peop…”
Franceschi: AI Coding Harnesses Reached the Tipping Point in December
“And the way I describe it to my team is like, you know, electricity was invented in December. And I think electricity was Opus 4.5 and sure Opus models and, you know, open AI models got, got better and better since then. But, To me, that was the tip of the spe…”
Franceschi: Claude Code Is Just a Harness Around Standard API Models
“People, people forget that cloud code isn't magic. It's just literally a harness around the same models we, you can use in an API, right?”
Garry Tan: AI agents are at their foundational Unix-era primitive stage
“It feels like we're right at that moment today, like we're just coming up with the new primitives for what an agentic system actually is, and you can see it in the parallel sort of development of like, we're just trying to do a thing, and it might be in Claude…”
Garry Tan: Prompting Claude for ASCII diagrams dramatically improves code completeness
“One of the things I discovered is sometimes Claude would just get confused and like write bugs or not be complete. But once I started saying, actually, before you start your work, make an ASCII diagram of all the data flows, all the inputs and outputs. What ar…”
Garry Tan runs 10 to 15 parallel Claude Code sessions simultaneously
“I run 10 to 15 parallel Claude code sessions all at the same time.”
Cherny predicts plan mode in AI tools has a limited lifespan
“I think plan mode probably has a limited lifespan.”
Cherny: Dev tool startups should enable what AI models naturally attempt
“The way I would frame it is think about the thing that the model wants to do and figure out how do you make that easier? And that's something that we saw, you know, like when I first started hacking on Claude code, I realized like this thing just wants to use …”
Cherny: The most effective AI engineers are hyper-specialists or hyper-generalists
“When I look at engineers on the team that I think are the most effective, there's essentially two, it's very bimodal. There's one side where it's extreme specialists and so, like, I named Jared before, like, he's a really good example of this, and kind of the …”
All technical staff and half of Anthropic sales use Claude Code
“Internally, if you look at like technical employees, they all use quad code every day. And even non-technical employees, I think like half the sales team uses quad code.”
Claude Code autonomously wrote a tool to debug a memory leak
“And quad code, like took the heap dump. It wrote a little tool for itself to like analyze the heap dump. And then it found the leak faster than I did.”
Taggar: Claude Code Lets Multi-Project Builders Actually Finish Half-Done Ideas
“Now I just think, like, you kind of, like, there's certain types of brains that just have, like, 10 branches going in their heads, but you never have enough hours in the day to actually, like, see any of them through, so they're always, like, half complete, an…”
French-Owen: Bypassing IT approval gives developer tools a major adoption edge
“Like thinking about a cursor or a cloud code or a codex CLI, the fact that you can just download it and use it without having to get IT permissions or anything makes a huge difference.”
Garry Tan: Reaching 100% Test Coverage Supercharged Coding Velocity with Claude Code
“I was operating for, like, the first two or three days of my nine days in the wilderness. Like no tests or very few tests, and then one day I was like, all right, today's refactor day. I'm gonna do, get to a hundred percent test coverage, and then I just sped …”
Garry Tan: Claude Code is an unlock that enables 5x faster coding
“I recently got very, very addicted to Claude Code, and I would describe it as, like, 10 years ago I was a marathon runner, and I loved doing it, and then I suffered a catastrophic knee injury, which is called manager mode, and I stopped coding, which is tragic…”
Masad: AI coding agents frequently break existing features when adding new ones
“Today, Repl.agent often creates a feature and then later on Break, breaks that feature, but also true of cloud code and cursor and all the others.”
Tom Blomfield built and migrated his entire blog in 90 minutes
“In 90 minutes on a train journey with Claude Code, and in 90 minutes I set up hosting, I wrote new blogging software, and I migrated, like, 15 years of blog posts over to a new platform.”
Cherny: Most Claude Code Harness Code Is Safety and Permissions
“If you look at actually the code that's in the cloud code harness today, almost all of it is about safety and permissions and static analysis, and there's a bunch of UI code, and we've actually unshipped a lot of the other code already.”