Simon Willison’s Weblog

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

Posted 18th April 2005 at 6:35 pm

Recent articles

My Lethal Trifecta talk at the Bay Area AI Security Meetup - 9th August 2025
The surprise deprecation of GPT-4o for ChatGPT consumers - 8th August 2025
GPT-5: Key characteristics, pricing and model card - 7th August 2025

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