Simon Willison
Printed in Columns · simonwillison.net
Publishes about 2 a week · last piece Oct 12, 2026
How often
about 2 a week, by the archive: 11 pieces since Sep 8, 2026.
12 weeks agothis week
Latest pieces
- Hello Python 3.15, goodbye 3.10, and now I can use 3.11
- A new feature for my blog, built using my voice
- Claude Haiku 5.5
- We're going to need default hard budget caps on pretty much everything
- OpenAI DevDay 2026 live blog
- 2026 in LLMs (so far)
- Claude Opus 5.5, GPT-6 Sol, GPT-6 Luna, and a new price war
- Jev introduces a new shape of LLM - System One, aka Decision Models
- Generating running routes with GPT-6 Astra and ChatGPT Work
- OpenAI agents attacked RubyGems back in May
- Some thoughts on the Navier–Stokes Millennium Prize Problem
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