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Simon Willison's Weblog
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Latest posts
Last updated about 14 hours ago
Anti-patterns: things to avoid
about 14 hours ago
Agentic Engineering Patterns &gt There are some behaviors that are anti-patterns in...
Something is afoot in the land of Qwen
about 16 hours ago
I'm behind on writing about Qwen 3.5, a truly remarkable family of...
Quoting Donald Knuth
1 day ago
Shock! Shock! I learned yesterday that an open problem I'd been working...
Gemini 3.1 Flash-Lite
1 day ago
Gemini 3.1 Flash-Lite Google's latest model is an update to their inexpensive...
GIF optimization tool using WebAssembly and Gifsicle
3 days ago
Agentic Engineering Patterns &gt I like to include animated GIF demos in...
February sponsors-only newsletter
3 days ago
I just sent the February edition of my sponsors-only monthly newsletter. If...
Quoting claude.com/import-memory
4 days ago
I'm moving to another service and need to export my data. List...
Interactive explanations
4 days ago
Agentic Engineering Patterns &gt When we lose track of how code written...
Please, please, please stop using passkeys for encrypting user data
5 days ago
Please, please, please stop using passkeys for encrypting user data Because users...
An AI agent coding skeptic tries AI agent coding, in excessive detail
5 days ago
An AI agent coding skeptic tries AI agent coding, in excessive detail...
Free Claude Max for (large project) open source maintainers
6 days ago
Free Claude Max for (large project) open source maintainers Anthropic are now...
Unicode Explorer using binary search over fetch() HTTP range requests
6 days ago
Unicode Explorer using binary search over fetch() HTTP range requests Here's a...