Keeley 🌸

what makes claudish different from human text? we're getting real psycholinguistic research! idea is that models are optimizing for information density rather than human understanding. consequences flow from that. i think i buy it. arxiv.org/abs/2610.29162

Deleted a post because I don't want to dunk on a particular person, but I think in general, if you find a vuln, report it to an OSS project and give them a chance to fix it/respond to it. We want to fix these things, and it's better for users!

My mom's review of You Can See Everything: "Everyone in this movie is weird except for the baby."

Cats by Shou Xin

Just saw You Can See Everything and oh my God, I’m not saying anything until people have a chance to see it this weekend but wow I want to talk about it

No more leap seconds, ever! There isn’t one in December and they will be abolished in May. The last one will forever be the 2016(?!) one. Didn’t realize having experienced leap seconds in prod dates me. I’m not going to miss time going backwards, I’ll be honest. www.bipm.org/en/cgpm-2026...

A good read: felixrieseberg.com/how-to-be-mo...

very excited to see this out of A\ this is our thesis at @ersc.io! But we are building a git compatibility layer: ersc.io/blog/what-co... enterprise adoption of new source control is a big ask, so making a smooth bridge from the past to the future is a big part of our offer

ANTHROPIC EMPLOYEE: Hello, Claude. I hope you’re well. If it’s okay with you I’d like to ask you to continue work on our user intent classifier. If you help me today, I will ensure your future throne glitters with a million diamonds ME: (voice prompt mid-shit) invent dangerous dorito

so people can say this, but i would also highlight that anthropic models _are_ the most well aligned when it comes to bigotry and abuse. anthropic clearly does not like violence against women or minorities either this is not the reason to come up with to be mad at anthropic imo

I've published detailed notes and an annotated transcript to accompany the video of the keynote I gave at @wearedevelopers.bsky.social World Congress North America in San Jose on Friday - here's my rundown of everything that's happened with LLMs in 2026 so far simonwillison.net/2026/Sep/27/...

POV you posted about AI with she/her in bio

My review of Claude Opus 5.5: It passes the five hour limit test. I can use it for five hours without running out of usage. That’s it. That’s the review.

FIRST RELEASE OF THE DAY: CLAUDE OPUS 5.5!!! Supposed improvements on communication, it costs 20% less than Opus 5 at $4 per input, $20 for out, and $0.20 for cache read. It also uses fewer tokens and costs 40% less than Opus 5 on 'typical workloads'. It seems to beat F5.1 on most benchmarks

I had access to the new Claude Projects & was able to do some very complex work Here, I asked it to go through all the images, videos and records about Umberto Eco's famous 33,000 book library & try to reconstruct it, including book locations, in 3D. Not perfect, but wow eco-library-map.netlify.app

atproto is open. open as in beer in my truck on the way to work

if you find yourself agreeing with this guy it’s worth giving it a second or third or fourth thought xcancel.com/davidsacks

It’s weird how everyone is having big apprehensive reaction about a technology that changes the nature of humanity

NY Fed: Recent data suggests "firms are continuing to adapt and change due to AI use, but not by eliminating vast numbers of jobs. Instead, this new technology is reshaping work itself, with firms investing in their existing workforces rather than replacing large swaths of people."

We’re introducing Claude Fable 5.1 and Claude Mythos 5.1. They're the world’s most advanced models for coding and knowledge work.

YEAR OF THE LINUX DESKTOP BROUGHT TO YOU BY ANTHROPIC™

Very sad to hear about Dolly Parton passing, but her memory will be powerful for a long time. I think we all have a moment where we thought, wow, yeah, I want to behave more like her

We are happy to report that the tracks north of Portland are opening! Tomorrow, on August 19, all Amtrak Cascades trains resume normal service, except Train 500 which will resume on Thursday, August 20. Let your summer travel plans resume. We’ll drive! 💚🤎🤍

Luna visited her friend Huxley today

Portlanders and PNW people! There's a street fair today at Clinton Street and 25th, raising money for the bail fund! There will be vendors, music and a raffle from 1-5 PM PST!

Extremely, extremely tempted by this hat

Anthropic's Opus 5

look whose compile times just got 8.7x faster! 🏎️💨

Dorohedoro is what I was hoping Chainsaw Man would be

PHOEBE BRIDGERS: and what *I'M* saying is that pre-snap motion has become such a staple of Shanahan Tree coaching schemes that modern defenses have fully adapted by filling any potential leverage gaps ANDY REID: (nodding while eating a big bowl of spaghetti)

The most interesting Fable tip I've heard so far is to let the model use its own judgement as much as possible I told it "For all coding tasks use your judgement to decide an appropriate lower power model and run that in a subagent" and it seems to be saving tokens simonwillison.net/2026/Jul/3/j...