Given the current vulnerability apocalypse, is there anyone left who thinks holding assets in cryptocurrency - where mistaken transactions a...

There's a French fork of Battle Drones with new models and music (and a cinematic intro video) and it is SO cool! https://menufactory43.gith...

I built a Command & Conquer style RTS called Battle Drones, mainly using Claude Opus 5.5, which runs in the browser and includes device-to-d...

Has anyone seen the prompts used by these awful reply bots? I'd be fascinated to know how they make their posts so soulless and infuriating ...

"Anthropic told investors on Wednesday distillation accounted for 5 per cent to 7 per cent of revenue" If true, and Q2 revenue was $11.5B, ...

Shared some notes on Python 3.15, using it with uv, and features from Python 3.11 I'm excited to use now that 3.10 is no longer the minimum ...

What's the best open weight Mixture-of-Experts LLM for coding that fits in less than 60GB of RAM? I think MoE might be necessary to get rea...

I built a new feature for my blog entirely by voice with Codex Desktop, while I was cooking dinner https://simonwillison.net/2026/Oct/9/buil...

This "Super Intelligence" thing is just so, so, so stupid I can't even

New open source cross-platform (Windows, macOS, Linux) sandboxing library from Microsoft - looks very promising, uses processcontainer/bubbl...

Pelicans and a bunch of notes on the pricing of the new Claude Haiku 5.5 https://simonwillison.net/2026/Oct/7/claude-haiku-5-5/

I released an LLM plugin for sending prompts to OpenAI's new Jev-clone decision model that's based on GPT-6 Luna https://simonwillison.net/2...

Anyone know when the models started being able to compose competent music? I had Opus 5.5 "write some computer game music for me" and the re...

I re-ran an experiment @colin_fraser ran against GPT-4o a while back to see how good it was at adding long numbers, only this time I tried Q...

Just published this post about how we’re going to need default hard budget caps on pretty much everything https://simonwillison.net/2026/Oct...

Now that we've had a few days with it, how are people differentiating between Dot and regular ChatGPT? I'm having trouble deciding when I s...

I'm at OpenAI's DevDay event in San Francisco today - as I have for the past three DevDay events, I'm running a live blog where I'll be post...

The most important thing about Sonnet 5.5 is that it's now the model that powers the free tier on https://claude.ai - so all of this stuff c...

I've published detailed notes and an annotated transcript to accompany the video of the keynote I gave at @WeAreDevs World Congress North Am...

I included a few references to this year's record-breaking Kākāpō breeding season in a talk I gave yesterday, and since Claude Opus 5.5 is s...