Simon Willison’s Weblog

Pink Numbers [dive into mark]. Because you can’t go wrong with even more blog clutter.

Posted 31st May 2004 at 3:07 am

Recent articles

GPT-5: Key characteristics, pricing and model card - 7th August 2025
OpenAI's new open weight (Apache 2) models are really good - 5th August 2025
ChatGPT agent's user-agent - 4th August 2025

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