Simon Willison’s Weblog

Believing AI vendors who promise you that they won't train on your data is a huge competitive advantage these days.

Posted 14th April 2025 at 4:30 pm

Recent articles

Embracing the parallel coding agent lifestyle - 5th October 2025
Designing agentic loops - 30th September 2025
Claude Sonnet 4.5 is probably the "best coding model in the world" (at least for now) - 29th September 2025

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