simonwillison.net

Latest posts

• Codex for Open Source

  Mar 07, 2026
• Quoting Ally Piechowski

  Mar 06, 2026
• Anthropic and the Pentagon

  Mar 06, 2026
• Agentic manual testing

  Mar 06, 2026
• Clinejection — Compromising Cline's Production Releases just by Prompting an Issue Triager

  Mar 06, 2026
• Introducing GPT‑5.4

  Mar 05, 2026
• Can coding agents relicense open source through a “clean room” implementation of code?

  Mar 05, 2026
• Anti-patterns: things to avoid

  Mar 04, 2026
• Something is afoot in the land of Qwen

  Mar 04, 2026
• Quoting Donald Knuth

  Mar 03, 2026
• Gemini 3.1 Flash-Lite

  Mar 03, 2026
• GIF optimization tool using WebAssembly and Gifsicle

  Mar 02, 2026
• February sponsors-only newsletter

  Mar 02, 2026
• My current policy on AI writing for my blog

  Mar 01, 2026
• Quoting claude.com/import-memory

  Mar 01, 2026
• Interactive explanations

  Feb 28, 2026
• Please, please, please stop using passkeys for encrypting user data

  Feb 27, 2026
• An AI agent coding skeptic tries AI agent coding, in excessive detail

  Feb 27, 2026
• Free Claude Max for (large project) open source maintainers

  Feb 27, 2026
• Unicode Explorer using binary search over fetch() HTTP range requests

  Feb 27, 2026
• Hoard things you know how to do

  Feb 26, 2026
• Quoting Andrej Karpathy

  Feb 26, 2026
• Google API Keys Weren't Secrets. But then Gemini Changed the Rules.

  Feb 26, 2026
• Quoting Benedict Evans

  Feb 26, 2026
• tldraw issue: Move tests to closed source repo

  Feb 25, 2026
• Claude Code Remote Control

  Feb 25, 2026
• I vibe coded my dream macOS presentation app

  Feb 25, 2026
• Quoting Kellan Elliott-McCrea

  Feb 25, 2026
• Linear walkthroughs

  Feb 25, 2026
• go-size-analyzer

  Feb 24, 2026