Simon Willison (@simonw) header
Simon Willison (@simonw) profile picture

Creator @datasetteproj, co-creator Django. PSF board. Hangs out with @natbat. He/Him. Mastodon: https://nitter.cf/t.co/t0MrmnJW0K Bsky: https://nitter.cf/t.co/OnWIyhX4CH

San Francisco, CA
Joined November 2006
Photo by Simon Willison (@simonw)Photo by Simon Willison (@simonw)Photo by Simon Willison (@simonw)Photo by Simon Willison (@simonw)Photo by Simon Willison (@simonw)Photo by Simon Willison (@simonw)Photo by Simon Willison (@simonw)Photo by Simon Willison (@simonw)Photo by Simon Willison (@simonw)Photo by Simon Willison (@simonw)
Replying to @groby
I think their revenue is 0 right now, they're burning VC
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Replying to @progrium
I've been using "AI mania" for when you get carried away building things that you don't even need (and feel stressed when your agents aren't working on anything), but your thing here sounds like something different to that
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Inspired me to try out spawn.co on my phone. Here's me flying a dragon around a castle, I prompted both the castle and the dragon into existence using the in-game "Savi" chatbot
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Fascinating case study of the sharpest edge of what you can do with agentic engineering in the Fable era - my eyebrows raised at least a dozen times while reading this
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the secret to becoming an expert is embarrassingly boring: build in public, write down what you learned and the process behind it, teach all that to someone, help them ship repeat for a few years, and you're solid – at Weehawken, NJ
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Simon Willison retweeted
very weird thing happening rn technical people are sad, they think their skills are now useless non-technical people are desperately wishing they were more technical so they could use agents better
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Did you try the tree appreciation one? tools.simonwillison.net/tree…
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These ones are pretty great!
Replying to @benjedwards
Apple II Agent (Opus 5.5) drew a pretty good pelican riding a bicycle (cc: @simonw) on the Apple Ii Seen here in both color and monochrome
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Your reply bot is making the internet worse.
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Replying to @brandur
You made me realize that I used to LIVE in the Python REPL and Jupyter notebooks and I've hardly used either in the past six months
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More notes on Kimi K3.1 - this one is I big deal, first time an open weights (well, soon-to-be open weights) model has competed this credibly with the current frontier simonwillison.net/2026/Oct/2…
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Pretty solid pelican tools.simonwillison.net/mark…
Introducing Kimi K3.1 Pro: our most capable 3T-class open-weight model. 🔹 1M-token context, 2.8T total / 104B active params (MoE), Multimodal. 🔹 Full-project coding: games in Unreal, Unity & Godot. 🔹 Excels at parametric 3D modeling in Blender & CAD. 🔹 More reliable at finance work: Accurate modeling with hallucination down by 65%. 🔹 Matching the strongest proprietary models across coding, agentic and knowledge benchmarks. Kimi K3.1 Pro and K3.1 Pro Highspeed (2–3× faster) are now live on Kimi.ai, Kimi Work, Kimi Code, and the Kimi API. Open weights by Nov 4, 2026. 🔗 API: platform.kimi.ai 🔗 Tech blog: kimi.ai/blog/kimi-k3-1-pro
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Not quite, "externally communicate" is about being able to send data back out again - if your system can fetch data but not send it then you don't have an exfiltration hole
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Replying to @otaliptus
It's not the cryptography I'm worried about, it's the security of end-user devices
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Yeah, I'm still nervous about straightforward agent mistakes - I don't let my agents have production access to modify deployed services (except on some dedicated test accounts)
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Replying to @shazow @z0r0zzz
Concept sounds useful, but has that project with 11 stars on GitHub been credibly audited?
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Replying to @shazow
Are immutable smart contracts the ones where bugs can't be fixed?
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Replying to @steida @Trezor
Hardware wallets better have VERY solid supply chain security (OK, Ledger don't classify their problem as a supply chain attack, so let's say they need protection against "localized distribution attacks" instead) ledger.com/blog-response-har…
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