Simon Willison’s Weblog

Seeing Metaclasses Clearly (via) Metaclasses in Ruby—but no cartoons :(

Posted 18th April 2005 at 6:35 pm

Recent articles

OpenAI are quietly adopting skills, now available in ChatGPT and Codex CLI - 12th December 2025
GPT-5.2 - 11th December 2025
Useful patterns for building HTML tools - 10th December 2025

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