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Updated 25 Oct, 05:30

25 articles

  • battledrones v14: Compass Rose, a four player map

    Release: battledrones v14: Compass Rose, a four player map I added four player online mode to Battledrones - previous maps were limited to two. Here's the initial prompt I used: Add a new map for a four player battle - four way rotational…

    Simon Willison Tech & AI EN 23 Oct 2026
  • Quick Study

    Tool: Quick Study Prompt to Claude Opus 5.5 High: Build an artifact where you open a photo and it rapidly (in a few seconds) paints a version of that photo using a canvas element and simulated paintbrush See also my previous experiment…

    Simon Willison Tech & AI EN 23 Oct 2026
  • Introducing Kimi K3.1 Pro

    Introducing Kimi K3.1 Pro Kimi K3.1 Pro landed on the Kimi API today - it's not yet open weights, but Moonshot promise "Full model weights will be released by Nov 4, 2026". They're also offering a "Highspeed" version that's 2-3x faster, at…

    Simon Willison Tech & AI EN 23 Oct 2026
  • DE STAAT - FREEDOM (Official Music Video)

    DE STAAT - FREEDOM (Official Music Video) OK well this is a first for me... at 00:44 in this new music video by Dutch alternative rock band De Staat: The visual effects are credited to Matties Grooten of Fake it or Leave it. Via flir on…

    Simon Willison Tech & AI EN 22 Oct 2026
  • Donating Agent Skills to the Agentic AI Foundation

    Donating Agent Skills to the Agentic AI Foundation News today from Anthropic: We’re committed to keeping Agent Skills open, community-driven, and vendor-neutral. Today, we are donating the standard to the Agentic AI Foundation (AAIF) under…

    Simon Willison Tech & AI EN 22 Oct 2026
  • Quoting Armin Ronacher

    As fun as AI is, we built so much bad software over the last 30 years, and now the universe is punishing us for our sins. — Armin Ronacher Tags: security, generative-ai, armin-ronacher, ai, ai-security-research, llms

    Simon Willison Tech & AI EN 22 Oct 2026
  • Today's PHP Security Release, and How We're Strengthening PHP Security

    Today's PHP Security Release, and How We're Strengthening PHP Security If you're running anything on PHP it's vital you upgrade - today's updates (across the entire PHP 8.x line) address two remote code execution holes, and there have been…

    Simon Willison Tech & AI EN 21 Oct 2026
  • Panache — RTS Belle Époque pour mobile

    Panache — RTS Belle Époque pour mobile Well this is delightful: I released Battle Drones yesterday under an Apache 2.0 License and there's already a French language fork which reskins the game to take place in steampunk 1900s France and…

    Simon Willison Tech & AI EN 21 Oct 2026
  • eMudhra Intermediate CA Compromise

    eMudhra Intermediate CA Compromise This is very, very bad news: The private keys of eight eMudhra intermediate CA certificates have been compromised. They chain to roots trusted by the Mozilla, Microsoft, Apple and Chrome root programs and…

    Simon Willison Tech & AI EN 20 Oct 2026
  • Battle Drones - a vibe coded RTS with audio-based multiplayer

    My latest vibe coded game experiment is a Command & Conquer style RTS (Real Time Strategy) game called Battle Drones (play it here). Unlike my previous experiments, this one is actually fun to play. I'm somewhat embarrassed to admit that I…

    Simon Willison Tech & AI EN 20 Oct 2026
  • My obituary for programming

    My obituary for programming Jeremy Scheff poignantly captures the key loss caused by coding agents for career programmers who enjoyed the puzzle of developing code: Programming turned into one of the greatest jobs you could imagine. You…

    Simon Willison Tech & AI EN 19 Oct 2026
  • llm-tools-datasette 0.1.1

    Release: llm-tools-datasette 0.1.1 When I switched LLM over to httpx2 in LLM 0.33 I forget that this would break any plugins which used httpx without directly depending on it. llm-tools-datasette was one of those plugins, now fixed. Tags…

    Simon Willison Tech & AI EN 18 Oct 2026
  • llm-echo 0.5

    Release: llm-echo 0.5 I'm working towards a new LLM release, and testing PRs caused me to revisit the llm-echo debug plugin. This plugin provides a "model" which doesn't involve an LLM at all - it just repeats back the prompts that have…

    Simon Willison Tech & AI EN 18 Oct 2026
  • Inline rendering with document​.currentScript

    Inline rendering with document​.currentScript Lean Rada describes a neat trick that takes advantage of the document.currentScript property. You can use that to drop in a tiny inline <script> element that replaces itself when the page…

    Simon Willison Tech & AI EN 17 Oct 2026
  • web-edit 0.1a2

    Release: web-edit 0.1a2 web-edit (previously) is my tiny web app for browsing and editing files in a folder. I mainly built it for editing files on different machines via Tailscale. I added a "copy to clipboard" option for both text and…

    Simon Willison Tech & AI EN 17 Oct 2026
  • Quoting Addy Osmani, Morgan Westlee Lunt, and Qing Wang

    We think "did a human read the code?" is an imprecise proxy for "what could go wrong with this change, and which check—automated or human—is the right one to catch it?" Asking that question also changed when review happens. Before, review…

    Simon Willison Tech & AI EN 16 Oct 2026
  • sparqlite: SPARQL 1.1 inside SQLite, written in Rust

    Research: sparqlite: SPARQL 1.1 inside SQLite, written in Rust This research task is really an experiment in running Claude Code for web in "Ultracode" mode, as described in Orchestrate subagents at scale with dynamic workflows in the…

    Simon Willison Tech & AI EN 15 Oct 2026
  • Chirp Pong

    Tool: Chirp Pong Another game experiment - I wanted to see if it was feasible to have a two player game on two separate phones running in static HTML where the networking code uses chirps sent via the microphone. It seems to work! Build a…

    Simon Willison Tech & AI EN 15 Oct 2026
  • Anthropic tells investors quarterly revenue up nearly 50% to $16.8bn ahead of IPO

    Anthropic tells investors quarterly revenue up nearly 50% to $16.8bn ahead of IPO The phrase "told investors" appears four times in this FT article, which reports on Anthropic's day of hosting investors on Wednesday. Lots of details in…

    Simon Willison Tech & AI EN 15 Oct 2026
  • LaTeX renderer

    Tool: LaTeX renderer Inspired by Paul Ford and Aboard Foundary's new web app Tiny Little Office, which provides a suite of web app content editors (a Word Processor, Outliner, Presentation Builder, Spreadsheet, Calculator, Drawing Tool…

    Simon Willison Tech & AI EN 14 Oct 2026
  • Tree Appreciator

    Tool: Tree Appreciator Another game experiment with Claude. This one used the default Claude iPhone app (chat mode, not Claude Code mode), where I prompted Claude Opus 5.5 Max with: Build a three js game called "Tree appreciator" - it…

    Simon Willison Tech & AI EN 14 Oct 2026
  • AI is mass decompiling games. That's both awesome and scary.

    AI is mass decompiling games. That's both awesome and scary. Indie game developer Popcar talks about the recent wave of AI-powered decompilation of existing games, enabling weird mashups between existing games, and producing a boom in game…

    Simon Willison Tech & AI EN 14 Oct 2026
  • Redesigning source control at Anthropic

    Redesigning source control at Anthropic Interesting piece from Anthropic describing why and how they built their own custom alternative to Git, based on the dramatic increase in rate of changes to their code after the past six months. In…

    Simon Willison Tech & AI EN 13 Oct 2026
  • llm-gemini 0.35

    Release: llm-gemini 0.35 I added support to llm-gemini for the new Gemini 4 Argon model, made available today via the Gemini API and for customers of their $100/month subscription plan. Here are the low, medium and high pelicans. As…

    Simon Willison Tech & AI EN 13 Oct 2026
  • Quoting Geoffrey Huntley

    If the agent isn't using my diagnostics library, I could introspect and update AGENTS.md, but there's still a delta, and it'll drift. Instead, I write a pre-commit hook that checks the git diff for direct calls to observability modules…

    Simon Willison Tech & AI EN 13 Oct 2026