The Archive

How we contain Claude across products A complaint I often have about sandboxing products is that they are rarely thoroughly documented , and in the absence of detailed documentation it's hard to know how much I can trust them. Anthropic just published a fantastic overview of how their various sandbox techniques work across Claude.ai , Claude Code, and Cowork. We constrain where and how an agent can act with process sandboxes, VMs, filesystem boundaries, and egress controls. The goal is to set a hard boundary on what an agent can reach. For example, if credentials never enter the sandbox, they...

Research: Running Python ASGI apps in the browser via Pyodide + a service worker Datasette Lite is my version of Datasette that runs entirely in the browser using Pyodide in WebAssembly. When I first built it four years ago I used Web Workers and code that intercepts navigation operations and fetches the generated HTML by running the Python app. This worked, but had the disadvantage that any JavaScript in <script> tags would not be executed - breaking some Datasette functionality and a whole lot of Datasette plugins. This morning I set Claude Opus 4.8 the task (in Claude Code for web) of figu...

Anthropic shipped Claude Opus 4.8 today. My favourite thing about it is this note in the release announcement: Users will find Opus 4.8 to be a modest but tangible improvement on its predecessor. There’s still more to be done: we’re working on developing and releasing models that provide many of the same capabilities as Opus at a lower cost. It's so refreshing to see an AI lab honestly describe a release as a minor incremental improvement over the previous model! Honesty seems to be a theme. Here's my other favorite note from that announcement: One of the most prominent improvements in Opus 4...

Release: llm-anthropic 0.25.1 New model: Claude Opus 4.8 ( claude-opus-4.8 ). New -o fast 1 option for fast mode , for organizations with that feature enabled on their account. Default max_tokens for each model now defaults to that model's maximum output rather than 8,192. #72 See also my notes on Opus 4.8 - I used this new release of llm-anthropic to generate the pelicans.

Are AI agents tools, co-authors, or researchers? We present a quantified case study ($N=1$): a physicist supervising an AI coding agent (Claude Code, Sonnet and Opus models) over 12 work days and 57 sessions to build CLAX-PT, a differentiable one-loop perturbation theory module in JAX. We documented and classified 15 supervision events by intervention level. The agent resolved ten autonomously by iterating against oracle tests. Two more by the physicist's domain knowledge. The three it could not -- all evaded oracle detection -- share a common property: the agent treated symptom reduction as ...

Today we're introducing dynamic workflows in Claude Code. Claude now writes its own orchestration scripts, fans work out across tens to hundreds of parallel subagents in a single session, and verifies its own results before anything reaches you. Work you'd normally plan in quarters can finish in days. Built for the tasks a single pass can't handle: codebase-wide bug hunts, security and optimization audits, large migrations and language ports, and high-stakes work where you want adversarial agents trying to break the answer before you see it. Progress is checkpointed, so long runs survive int...

An upgrade to our Opus class of models, with stronger performance across coding, agentic tasks, and professional work, and the consistency to handle long-running work.

Anthropic is releasing Claude Opus 4.8 on Thursday, and the company is touting the model's "honesty." According to Anthropic, it trains "all [its] models to be honest - for instance, to avoid making claims that they can't support." But it notes that "a general problem with AI models is that they sometimes jump to conclusions, confidently presenting their work as making progress despite thin evidence." The AI lab claims that early testers have found that Opus 4.8 "is more likely to flag uncertainties about its work and less likely to make unsupported claims." In the company's evaluations, Opus...

Link: anthropic.com

We’re upgrading Claude Opus to a new version: Claude Opus 4.8. It builds on Opus 4.7 with sharper judgment, more honesty about its own progress, and the ability to work independently for longer than its predecessors. Available today for the same price. In Claude Code, you can hand off a feature, a migration, or a bug sweep and let it follow the work through while you focus on what’s next. Also launching today: * Fast mode for Opus 4.8 (research preview). Same model at roughly 2.5x the speed, now three times cheaper than before. * Dynamic workflows in Claude Code (research preview). Claude ...

Going through the credit card statement, here's what I had active: Claude Pro (40), ChatGPT Plus (20), Cursor (20), Perplexity Pro (20), Notion AI (10), Granola (20), ElevenLabs Starter (5), Midjourney Basic (10), Gamma Pro (10), Beautiful.ai (12), Otter Pro (17), Loom Business (15), Zapier Pro (30), Make Core (10), Tactiq Pro (8), Descript Creator (15), Reclaim.ai Pro (8), Motion (19), Superhuman (30), one i can't remember the name of (10), some ai-something for instagram captions (11) Then I sat down and wrote next to each one the last time I'd actually used it. Not opened it, used it for...

Imagine a world run by AI agents. What does it look like? What are the values or societal priorities? Is it a safer or more dangerous world? Enterprise AI startup Emergence AI is trying to find out. The company just launched Emergence World, a research lab dedicated to stress-testing the long-term viability of continuously-running AI systems. The organization ran five 15-day simulations, each governed by a different AI: Claude, ChatGPT, Grok, Gemini, and a fifth simulation run by a mix of models to see what kind of world each one builds, and whether it holds. Each simulation netted wildly d...

I love Claude, but the usage limit has made me weirdly strategic For actual messy stuff, I still go straight to Claude because it saves me a ton of time But for tiny questions, I now catch myself thinking, “Do I really need to burn a message on this?” So yes, I tried using my own brain again. It’s technically free, but the response time is awful and it starts hallucinating the second I’m tired or hungry. Honestly not a terrible deal if I remember to SLEEP

The reported Uber story is so on brand it almost reads like satire. Incredibly useful tool, slightly magical workflow, then finance walks in with a flamethrower in April. If they really finished the year's claude code budget by month four, that does not mean claude code is bad. It means the usage pattern changed faster than procurement math did. Claude is good enough at coding that people stopped treating it like autocomplete and started treating it like a coworker that never sleeps. That is exactly where the cost curve gets weird. A dev asks for a refactor. Claude reads context, plans, edi...

At work we've been prompted about running Claude Code overnight. The suggestion came in form of a document that loosely outlined how this could be done... use git worktrees, make tight specs, no commit to main, static code analysis and lining etc. Very high level. Had a bit of sales pitch smell to it, but has enough content to peak my interest in spite of it. I looked at reddit to verify if this is even an idea that could be taken seriously. I could only find a couple of reddit posts with little actual information and usually from about 4-6 months ago so not much credibility for today. I'd ...

RESOLVED, it happened because I have a claude qol extension. nothing bad happening this style appeared in my claude app of nowhere, i never created it and the name's weird, has anyone seen this too, or is it just me? does anyone have the answe why this appeared?

I've been noticing this lately. I use Opus 4.7 with Claude Code, and I've been using Claude Code for a long time. Lately, I've been noticing some strange behaviour from Opus. Things like; \- Stopping for no reason and asking "should we stop here?" in the middle of a task \- Asking multi-choice questions with a "pause here, I'll continue later" included in the options randomly for no reason \- During a requirement-gathering questionnaire, asking me "why do you need this" and "what would you do if this feature was not implemented?" (it asked me this today and I was really surprised by thi...

Recently I asked my wife if we could do some sexy stuff later in the evening and she eye rolled me and said without looking up from her phone “Put it in a request. Maybe a Google Form. And I might say yes”. Ohhhh? Unfortunately for both of us, my degenerate brain took that seriously... what if I make an actual requesting/asking type app where we can both send in sex acts at certain times and agree, pass or counter? Meet [Sexualsync](https://sexualsync.io/). Teehee It’s a private, mobile-only app for couples to bring up the stuff that can be weirdly hard to say out loud: asks/requests, tim...

The weekly usage of Claude Design was too small, so I think this is a good thing.

With the OS I can ask Claude "what did I spend on coffee in 2022" and get back "$847 across 213 transactions, mostly Blue Bottle and Verve". Name me one expense tracking SaaS that can do that! And its not just my financials, my OS contains everything about my life in one place so Claude can reason about it. I've been building this incrementally for a few months. Its just a small web app on Cloudflare that holds my entire life: * bank transactions from Chase, Apple Card, BoA business * every receipt out of Gmail going back to 2019 * legal filings for my green card (I-140 still pending lol),...

no more separate usage limits.

This was super fun to build and I love watching as I slowly eat away at my quota. Just a simple Raspberry Pi 3 + 3D printed case + 640x480 LCD and some pygame code and you too can have a little dashboard on your desk to watch your tokenmaxxing progress (or lack there off like me). [https://github.com/fuziontech/claude-quota-display](https://github.com/fuziontech/claude-quota-display)

A while back I wrote a post on r/wallstreetbets about why Anthropic's revenue story doesn't hold up the way the headlines suggest. It got removed because you can't take positions in a private company. But the core argument is playing out now, so I want to share it here for discussion. URL of the removed post: [https://www.reddit.com/r/wallstreetbets/comments/1sxdjt5/if\_anthropic\_goes\_public\_this\_year\_its\_gonna\_be](https://www.reddit.com/r/wallstreetbets/comments/1sxdjt5/if_anthropic_goes_public_this_year_its_gonna_be) The thesis was simple: From my circles in tech scene in Berlin...

Guys I mailed claude support and got reply from Fin AI saying the support team is too busy please submit an appeal then it will be verified(which got rejected initially). Now I doubt do they even have a support team? Cause there isn't any phn number available and the support mail is on auto reply

Every time I watch someone use Claude Code on a real codebase, the same thing happens. It rewrites a module that three other modules depend on without any awareness of coupling. It just reads the file, makes changes, moves on It reads files one at a time without any map. Doesn't know which files are coupled. Doesn't know who owns what. Doesn't know why that weird pattern in the auth module exists on purpose. I've been building an open source MCP layer to fix this called repowise. Self-hosted, pip install, AGPL-3.0. Five context layers that sit between your codebase and the model: Graph - ...

I share some of the work I do on social media, I mainly use Claude for coding cause it saves me so much time but I don't understand why people perceive a lot of the work someone does negatively only cause they're using an AI tool. X seems to be the most AI friendly but other social media platforms seem to hate all of a sudden once they learn something was built using AI. Sources that talk about the same thing: [https://creators.yahoo.com/lifestyle/story/why-young-people-hate-i-155613887.html](https://creators.yahoo.com/lifestyle/story/why-young-people-hate-i-155613887.html) , [https://www....

I've noticed I get way more out of Claude when I treat it less like a search engine and more like someone I'm thinking through a problem with. Instead of asking "what's the best way to structure a REST API?", I'll say "here's what I'm trying to do and here's what I'm leaning toward push back on me if I'm missing something." The responses are noticeably different. It actually disagrees, flags assumptions I didn't realise I was making, and sometimes lands on a direction I wouldn't have reached on my own. Curious if others do this deliberately, or if you've found other "modes" of using it tha...

A few days ago there was a thread here asking what he most useful thing you've built with Claude was. A LOT of replies. I read all of them and then something clicked, I wanted to put it on the table. First of all, the list was incredible. An HTML file on someone's phone correlating migraines with barometric pressure, because the App Store wanted 80 bucks a year. A Garmin data archiver, because the official app deletes them. A grocery list sorted by the aisle layout of one specific supermarket. A bioinformatics pipeline for a handful of microbes, written by someone who isn't a bioinformaticia...

Quick story: I kept losing context every time I had to \`git stash\` and switch branches to test something an agent had suggested. Then I actually read up on \`git worktree\` and it solved the whole problem. What my setup looks like now: \- Main worktree: where I review and commit \- 2-3 extra worktrees, each with its own Claude Code session running on its own branch \- When one agent finishes a task, I \`cd\` in, review the diff, merge, move on \- No stashing, no context switching, no "wait what was I doing" Full writeup in the article on Medium (https://medium.com/@buildwithpulkit/git...

Been tweaking my Claude "User preferences" to make responses more useful and less corporate-AI-ish. So far it feels a bit better than without them. Maybe someone has stronger setups, would love to see them. Here's mine: Do not repeat the user’s question before answering. Avoid repetition and unnecessary summaries. Do not make responses longer than necessary. Write concisely and directly. Start with the conclusion, then explain if needed. No filler, long introductions, or generic AI phrases. When communicating and writing te...