Simon Willison

@simonw

Creator @datasetteproj, co-creator Django. PSF board. Hangs out with @natbat. He/Him. Mastodon: fedi.simonwillison.net/@simon Bsky: simonwillison.net

San Francisco, CA

simonwillison.net

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Simon Willison
@simonw
Sep 14
Built a little local web app to help edit commit messages for a repo simonwillison.net/2026/Sep/14/co…
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Simon Willison
@simonw
Sep 13
This is pretty neat: ChatGPT Work and GPT-6 Astra (I used "Max") can take an address and produce a 5K/10K circular running route starting from that address, using OSM data
simonwillison.net
Generating running routes with GPT-6 Astra and ChatGPT Work
Here’s a neat thing I had ChatGPT Work with GPT-6 Astra (Max) do this morning: I live at . Figure out 5K and 10K running routes from me that …
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Simon Willison
@simonw
Sep 12
Wow. Turns out another OpenAI agent swarm was busy spamming and exploiting RubyGems way back in May, within days of the previously uncovered Wiki attacks:
simonwillison.net
OpenAI agents carried out an undisclosed attack on RubyGems
Bombshell report from Spencer Kitts, Thomas Larsen, and Sydney Von Arx - three of the four authors of the report on the agent attack on disused wikis (previously) last week. …
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Simon Willison
@simonw
Sep 11
"Production code written by Claude should have a higher bar than if it was written by a human" 💯
Boris Cherny
@bcherny
Sep 11
Replying to @bcherny
Hey ████, I think there is room for both. 1. Prototypes and other throw-away code can be treated as totally black box. If you’re going to throw it away anyway, and if the blast radius of it breaking is low, it doesn’t need to be perfect. 2. Production code written by Claude
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Simon Willison
@simonw
Sep 11
Datasette 1.0a39 and 0.65.4 security releases - datasette.io/blog/2026/sept… We ran an extensive audit using Claude Fable 5.1, GPT-5.6 Sol and GPT-6 Astra, then fixed a range of different bugs. If you're running a Datasette instance on a public website you should upgrade.
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