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Simon Willison's Weblog

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IA Programmation
Using Claude Code: The Unreasonable Effectiveness of HTML
IA Programmation

Using Claude Code: The Unreasonable Effectiveness of HTML

Using Claude Code: The Unreasonable Effectiveness of HTML Thought-provoking piece by Thariq Shihipar (on the Claude Code team at Anthropic) advocating for HTML over Markdown as an output format to request from Claude. The article is crammed with interesting examples (collected on this site) and prompt suggestions like this one: Help me review this PR by creating an HTML artifact that describes it. I'm not very familiar with the streaming/backpressure logic so focus on that. Render the actual…

Simon Willison's Weblog
Big Words
IA Programmation

Big Words

Tool: Big Words I'm using my vibe coded macOS presentations tool to put together a talk, and I wanted to add a slide with some text on it. The tool only accepts URLs, so I put together a quick page that accepts query string arguments and turns them into a simple slide. Here's an example: https://tools.simonwillison.net/big-words?text=simonwillison.net&gradient=1&size=9.5 Double click or double tap the page to access a form for modifying the different options. Tags: vibe-coding, tools

Simon Willison's Weblog
Behind the Scenes Hardening Firefox with Claude Mythos Preview
IA Programmation

Behind the Scenes Hardening Firefox with Claude Mythos Preview

Behind the Scenes Hardening Firefox with Claude Mythos Preview Fascinating, in-depth details on how Mozilla used their access to the Claude Mythos preview to locate and then fix hundreds of vulnerabilities in Firefox: Suddenly, the bugs are very good Just a few months ago, AI-generated security bug reports to open source projects were mostly known for being unwanted slop. Dealing with reports that look plausibly correct but are wrong imposes an asymmetric cost on project maintainers: it’s cheap…

Simon Willison's Weblog
Notes on the xAI/Anthropic data center deal
IA Programmation

Notes on the xAI/Anthropic data center deal

There weren't a lot of big new announcements from Anthropic at yesterday's Code w/ Claude event, but the biggest by far was the deal they've struck with SpaceX/xAI to use "all of the capacity of their Colossus data center". As I mentioned in my live blog of the keynote, that's the one with the particularly bad environmental record. The gas turbines installed to power the facility initially ran without Clean Air Act permits or pollution control devices, which they got away with by classifying…

Simon Willison's Weblog
GitHub Repo Stats
IA Programmation

GitHub Repo Stats

Tool: GitHub Repo Stats One of the things I always look for when evaluating a new GitHub repository is the number of commits it has... but that number isn't visible on GitHub's mobile site layout. I built this tool to fix that, using this prompt: Given a GitHub repo URL or foo/bar repo ID show information about that repo absorbed via wither REST or graphql CORS fetch() including the number of commits in the repo and other useful stats Example output for simonw/datasette and simonw/llm. Tags:…

Simon Willison's Weblog
Vibe coding and agentic engineering are getting closer than I'd like
IA Programmation

Vibe coding and agentic engineering are getting closer than I'd like

I recently talked with Joseph Ruscio about AI coding tools for Heavybit's High Leverage podcast: Ep. #9, The AI Coding Paradigm Shift with Simon Willison. Here are some of my highlights, including my disturbing realization that vibe coding and agentic engineering have started to converge in my own work. One thing I really enjoy about podcasts is that they sometimes push me to think out loud in a way that exposes an idea I've not previously been able to put into words. Vibe coding and agentic…

Simon Willison's Weblog
datasette-referrer-policy 0.1
IA Programmation

datasette-referrer-policy 0.1

Release: datasette-referrer-policy 0.1 The OpenStreetMap tiles on the Datasette global-power-plants demo weren't displaying correctly. This turned out to be caused by two bugs. The first is that the CAPTCHA I added to that site a few weeks ago was triggering for the .json fetch requests used by the map plugin, and since those weren't HTML the user was not being asked to solve them. Here's the fix. The second was that OpenStreetMap quite reasonably block tile requests from sites that use a…

Simon Willison's Weblog
Our AI started a cafe in Stockholm
IA Programmation

Our AI started a cafe in Stockholm

Our AI started a cafe in Stockholm Andon Labs previously started an AI-run retail store in San Francisco. Now they're running a similar experiment in Stockholm, Sweden, only this time it's a cafe. These experiments are interesting, and often throw out amusing anecdotes: During the first week of inventory, Mona ordered 120 eggs even though the café has no stove. When the staff told her they couldn’t cook them, she suggested using the high-speed oven, until they pointed out the eggs would likely…

Simon Willison's Weblog
llm-echo 0.5a0
IA Programmation

llm-echo 0.5a0

Release: llm-echo 0.5a0 New -o thinking 1 option to help test against LLM 0.32a0 and higher. This plugin provides a fake model called "echo" for LLM which doesn't run an LLM at all - it's useful for writing automated tests. You can now do this: uvx --with llm==0.32a1 --with llm-echo==0.5a0 llm -m echo hi -o thinking 1 This will fake a reasoning block to standard error before returning JSON echoing the prompt. Tags: llm

Simon Willison's Weblog
Quoting John Gruber
IA Programmation

Quoting John Gruber

So it’s well known that Y Combinator owns some stake in OpenAI. But how big is that stake? This seems like devilishly difficult information to obtain. I asked around and a little birdie who knows several OpenAI investors came back with an answer: Y Combinator owns about 0.6 percent of OpenAI. At OpenAI’s current $852 billion valuation, that’s worth over $5 billion. — John Gruber, Y Combinator’s Stake in OpenAI Tags: openai, y-combinator, ai, john-gruber

Simon Willison's Weblog
Granite 4.1 3B SVG Pelican Gallery
IA Programmation

Granite 4.1 3B SVG Pelican Gallery

Granite 4.1 3B SVG Pelican Gallery IBM released their Granite 4.1 family of LLMs a few days ago. They're Apache 2.0 licensed and come in 3B, 8B and 30B sizes. Granite 4.1 LLMs: How They’re Built by Granite team member Yousaf Shah describes the training process in detail. Unsloth released the unsloth/granite-4.1-3b-GGUF collection of GGUF encoded quantized variants of the 3B model - 21 different model files ranging in size from 1.2GB to 6.34GB. All 21 of those Unsloth files add up to 51.3GB,…

Simon Willison's Weblog
Quoting Andy Masley
IA Programmation

Quoting Andy Masley

[...] Between 2000 and 2024, farmers sold in total a Colorado-sized chunk of land all on their own, 77 times all land on data center property in 2028, and grew more food than ever on what was left. None of this caused any problems for US food access. And then, in the middle of all this, a farmer in Loudoun County sells a few acres of mediocre hay field to a hyperscaler for ten times its agricultural value, and the response is that we’re running out of farmland. — Andy Masley, pushing back…

Simon Willison's Weblog