Simon Willison’s Weblog

Inside .git. This single diagram filled in all sorts of gaps in my mental model of how git actually works under the hood.

Posted 25th January 2024 at 2:59 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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