Changes in the system prompt between Claude Opus 46 and 47

Changes in the system prompt between Claude Opus 46 and 47

https://simonwillison.net/2026/Apr/18/opus-system-prompt/#atom-entries · April 18, 2026

Join us at PyCon US 2026 in Long Beach - we have new AI and security tracks this year

Join us at PyCon US 2026 in Long Beach - we have new AI and security tracks this year

https://simonwillison.net/2026/Apr/17/pycon-us-2026/#atom-entries · April 17, 2026

Qwen36-35B-A3B on my laptop drew me a better pelican than Claude Opus 47

Qwen36-35B-A3B on my laptop drew me a better pelican than Claude Opus 47

https://simonwillison.net/2026/Apr/16/qwen-beats-opus/#atom-entries · April 16, 2026

AI cybersecurity is not proof of work

AI cybersecurity is not proof of work The proof of work is the wrong analogy: finding hash collisions, while exponentially harder with N, is guaranteed to find, with enough work, some S so that H(S) satisfies N, so an asymmetry of resources used will see the side with more “work ability” eventually winning. But bugs are different: 1. Different

http://antirez.com/news/163 · April 16, 2026

An Arm Mainboard for the Framework Laptop

An Arm Mainboard for the Framework Laptop Using the repair-friendly Framework 13 laptop chassis, I’ve tested the low-end x86 option (a Ryzen AI 5 340 Mainboard), the fastest RISC-V option (DC-ROMA II), and today I’m publishing results from the only Arm Mainboard, the MetaComputing AI PC, which has a 12-core Arm SoC and up to 32 GB

https://www.jeffgeerling.com/blog/2026/arm-mainboard-for-framework-laptop/ · April 15, 2026

watgo - a WebAssembly Toolkit for Go

watgo - a WebAssembly Toolkit for Go

https://eli.thegreenplace.net/2026/watgo-a-webassembly-toolkit-for-go/ · April 9, 2026

Metas new model is Muse Spark and metaai chat has some interesting tools

Metas new model is Muse Spark and metaai chat has some interesting tools

https://simonwillison.net/2026/Apr/8/muse-spark/#atom-entries · April 8, 2026

Anthropics Project Glasswing - restricting Claude Mythos to security researchers - sounds necessary to me

Anthropics Project Glasswing - restricting Claude Mythos to security researchers - sounds necessary to me

https://simonwillison.net/2026/Apr/7/project-glasswing/#atom-entries · April 7, 2026

Before we start on quantum

Before we start on quantum Imagine that every week for twenty years, people message you asking you to comment on the latest wolf sighting, and every week you have to tell them: I haven’t seen a wolf, I haven’t heard a wolf, I believe wolves exist but I don’t yet see evidence of them anywhere

https://scottaaronson.blog/?p=9668 · April 7, 2026

Build your own Dial-up ISP with a Raspberry Pi

Build your own Dial-up ISP with a Raspberry Pi Last year my aunt let me add her original Tangerine iBook G3 clamshell to my collection of old Macs1. It came with an AirPort card—a $99 add-on Apple made that ushered in the Wi-Fi era. The iBook G3 was the first consumer laptop with built-in Wi-Fi antennas, and by far the

https://www.jeffgeerling.com/blog/2026/build-your-own-dial-up-isp-with-a-raspberry-pi/ · April 3, 2026