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Visit simonwillison.net → RSS feedOn Hacker News May 2009 – Nov 2026
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Whether or not you enjoy MrBeast’s format of YouTube videos (here’s a 2022 Rolling Stone profile if you’re unfamiliar), this leaked onboarding document for new members of his production company …
Anthropic are strongly rumored to be about to have their first profitable quarter. Stories are circulating of companies surprised at how expensive their LLM bills are becoming from usage by …
Here’s a product feature which the world is going to need a whole lot more of over the coming months and years: default hard budget caps. I’m talking about the …
I wrote the other day about Uber blowing its 2026 AI budget in four months, and how that wasn't particularly surprising given they would have set that budget in 2025, …
I'm worried that they put co-pilot in Excel because Excel is the beast that drives our entire economy and do you know who has tamed that beast? Brenda. Who is …
I’ve been dipping into the r/ChatGPT subreddit recently to see how people are reacting to the GPT-5 launch, and so far the vibes there are not good. This AMA thread …
OpenAI announced ChatGPT Work on July 9th, and have been furiously iterating on it ever since. It is an extraordinarily confusing and very powerful product. Here’s what I’ve figured out …
One of the most common concerns I see about large language models regards their training data. People are worried that anything they say to ChatGPT could be memorized by it …
Aruna Ranganathan and Xingqi Maggie Ye from Berkeley Haas School of Business report initial findings in the HBR from their April to December 2025 study of 200 employees at a …
The Python Software Foundation was recently "recommended for funding" (NSF terminology) for a $1.5m grant from the US government National Science Foundation to help improve the security of the Python …
I think I’ve come up with a novel hack for the challenge of getting your company to financially support the open source projects that it uses: reach out to the …
I’m at OpenAI DevDay in San Francisco, and I’m trying something new: a live blog, where this entry will be updated with new notes during the event. See OpenAI DevDay: …
My post Bing: “I will not harm you unless you harm me first” really took off. It sat at the top of Hacker News for a full day, and is …
As a USA 501(c)(3) the OpenAI non-profit has to file a tax return each year with the IRS. One of the required fields on that tax return is to “Briefly …
SemiAnalysis published something of a bombshell leaked document this morning: Google “We Have No Moat, And Neither Does OpenAI”. The source of the document is vague: The text below is …
I love hack days. I was working in the vicinity of Chad Dickerson when he organised the first internal Yahoo! Hack Day back in 2005, and I’ve since participated in …