Simon Willison’s Weblog

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Wednesday, 1st October 2025

I just sent out the September edition of my sponsors-only monthly newsletter. If you are a sponsor (or if you start a sponsorship now) you can access a copy here. The sections this month are:

  • Best model for code? GPT-5-Codex... then Claude 4.5 Sonnet
  • I've grudgingly accepted a definition for "agent"
  • GPT-5 Research Goblin and Google AI Mode
  • Claude has Code Interpreter now
  • The lethal trifecta in the Economist
  • Other significant model releases
  • Notable AI success stories
  • Video models are zero-shot learners and reasoners
  • Tools I'm using at the moment
  • Other bits and pieces

Here's a copy of the August newsletter as a preview of what you'll get. Pay $10/month to stay a month ahead of the free copy!

# 5:33 am / newsletter

2025 » October

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