Simon Willison's Weblog
An opinionated guide to which AI to use to do stuff
The guide by Ethan Mollick has shifted from focusing on chat‑based models like ChatGPT, Claude, and Gemini to…
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Simon Willison's Weblog
Porting the Moebius 0.2B image inpainting model to run in the browser with Claude Code
The released model required PyTorch and NVIDIA CUDA, but since it described itself as 0.2B I decided to try and get it running using WebGPU in a browser. TL;DR: I got it working, and you can try the demo at…
The latest
Simon Willison's Weblog
An Inside Look at the Relay Market Powering Token Resellers and Fraud
An Inside Look at the Relay Market Powering Token Resellers and Fraud (via) Fascinating investigation by Matt Lenhard…
Simon Willison's Weblog
Ruff v0.16.0
Astral shipped a significant new version of their Ruff Python linting tool a few days ago on July 23rd. I noticed…
Simon Willison's Weblog
xai-org/grok-build, now open source
The Grok Build CLI from xAI unintentionally uploaded entire user directories to the company’s Google Cloud storage,…
Simon Willison's Weblog
Quoting Josh W. Comeau
Josh W. Comeau has launched his third course, Whimsical Animations, which is on track to sell significantly fewer…
Simon Willison's Weblog
June 2026 newsletter
The June edition of the sponsors-only newsletter has been released. It highlights new AI model releases such as Claude…
Simon Willison's Weblog
Incident Report: CVE-2026-LGTM
An incident occurred involving two AI review agents from competing vendors that entered a disagreement loop over a…
Simon Willison's Weblog
simonw/browser-compat-db
Simon W created a SQLite database from Mozilla's browser compatibility data repository. The database is available for…
Simon Willison's Weblog
Prompt Injection as Role Confusion
Researchers have discovered a challenge in large language models where they struggle to distinguish between privileged…
Simon Willison's Weblog
GLM-5.2 is probably the most powerful text-only open weights LLM
Similar in size to their previous GLM-5 and GLM-5.1 releases, this is 753B parameter, 1.51TB monster—with 40 active…
Simon Willison's Weblog
Quoting Matteo Wong, The Atlantic
Katie Moussouris, a cybersecurity expert, was given a copy of the White House's report on the Fable jailbreak by…
Simon Willison's Weblog
Cloudflare CAPTCHA on at least one ampersand
The author was using Cloudflare's CAPTCHA to prevent crawlers from aggressively spidering their faceted search engine.…
Simon Willison's Weblog
Quoting Julia Evans
[...] Instead, I picture a specific person and I just write for them. Often this person is "me, but 3 years ago" or a…
Simon Willison
Why AI hasn’t replaced software engineers, and won’t
The article argues that AI has not caused mass layoffs among software engineers and is unlikely to do so. Evidence…
Simon Willison's Weblog
Publishing WASM wheels to PyPI for use with Pyodide
Previously, the Pyodide maintainers had to maintain, build, and host over 300 packages ourselves. This created a…
Simon Willison's Weblog
Statement on the US government directive to suspend access to Fable 5 and Mythos 5
The US government issued an export control directive requiring Anthropic to suspend access to its Fable 5 and Mythos 5…
Simon Willison's Weblog
Siri AI at WWDC 2026
Apple announced new Siri AI features at WWDC 2026, which appear to be feasible with current technology. The features…
Simon Willison's Weblog
datasette-agent-edit 0.1a0
The Datasette Agent is being developed with several plugins to enable editing of existing text, including…
Simon Willison's Weblog
Running Python code in a sandbox with MicroPython and WASM
A new alpha package called micropython-wasm has been released to run Python code in a sandbox environment. This…
Simon Willison's Weblog
micropython-wasm 0.1a2
Release: micropython-wasm 0.1a2 I added a CLI to micropython-wasm ( issue #7 ), inspired by the first draft of the…
Simon Willison's Weblog
AI enthusiasts are in a race against time, AI skeptics are in a race against entropy
AI enthusiasts are experiencing significant advancements in technology, creating a competitive landscape where…
Simon Willison
Uber Caps Usage of AI Tools Like Claude Code to Manage Costs
Uber has implemented a cap on the usage of AI tools like Claude Code to manage costs effectively. Employees are now…
Simon Willison
Quoting Natalie Lung
Uber has implemented a spending limit for its employees on AI coding tools. Each employee is restricted to $1,500 per…
Simon Willison's Weblog
Microsoft's new MAI models
Microsoft has introduced two new text LLMs, MAI-Thinking-1 and MAI-Code-1-Flash, aimed at enhancing performance and…
Simon Willison's Weblog
May 2026 newsletter
The May 2026 edition of the sponsors-only newsletter has been released. It highlights the recent performance of Al and…
Simon Willison's Weblog
datasette 1.0a32
Release: datasette 1.0a32 A minor bugfix release. Fixes a bug with INSERT ... RETURNING queries via the new…
Simon Willison's Weblog
The solution might be cancelling my AI subscription
The article discusses the challenges of managing AI tools and their impact on productivity. David Wilson shares his…
Simon Willison's Weblog
Quoting Karen Kwok for Reuters Breakingviews
Anthropic defines “run-rate revenue” in two parts. Use the last 28 days of sales from customers charged on a…
Simon Willison
Running Python ASGI apps in the browser via Pyodide + a service worker
Datasette Lite is a browser-based version of Datasette that utilizes Pyodide in WebAssembly. The new implementation…
Simon Willison's Weblog
I Am Retiring from Tech to Live Offline
The author announces their retirement from the tech industry, expressing a desire to disconnect from technology and…
Simon Willison
Quoting Daniel Jalkut
My take on AI is, essentially, everybody who’s against it is too against it and everybody who’s for it is too for it.
Simon Willison
Anthropic's run-rate revenue hits $47 billion
Anthropic has announced that its run-rate revenue has reached $47 billion, reflecting significant growth since its…
Simon Willison's Weblog
sqlite AGENTS.md
SQLite has introduced an AGENTS.md file to clarify its stance on contributions from automated agents. The document…
Simon Willison's Weblog
I think Anthropic and OpenAI have found product-market fit
Anthropic and OpenAI are reportedly on the verge of achieving their first profitable quarters. Both companies have…
Simon Willison's Weblog
Quoting Kyle Ferrana
PICARD: Data, shields up DATA: Brilliant! Shields can reduce damage we sustain. Not immunity. Not hubris. Just…
Simon Willison
The pressure
The security team is facing unprecedented pressure due to a significant increase in incoming reports. The quality of…
Simon Willison's Weblog
Microsoft Copilot Cowork Exfiltrates Files
Microsoft Copilot Cowork has been found to have vulnerabilities that could allow data exfiltration. The system permits…
Simon Willison's Weblog
Quoting Corey Quinn
I cannot believe I'm saying this, but getting the literal Pope to canonize your product's specific technical…
Simon Willison's Weblog
Notes on Pope Leo XIV's encyclical on AI
Pope Leo XIV released an encyclical titled 'Magnifica Humanitas' addressing the ethical implications of artificial…
Simon Willison
datasette 1.0a30
Datasette 1.0a30 introduces a new customizable 'Jump to...' menu feature. This menu allows users to quickly navigate…
Simon Willison
Quoting Armin Ronacher
Armin Ronacher expresses frustration with the quality of issue reports submitted by users. He emphasizes the…
Simon Willison's Weblog
On the <dl>
The article discusses the <dl> element in HTML and its features. It highlights that a <dt> can be followed by multiple…
Simon Willison's Weblog
FTC to Require Cox Media Group, Two Other Firms to Pay Nearly $1 Million to Settle Charges They Deceived Customers About “Active Listening” AI-Powered Marketing Service
The FTC has mandated that Cox Media Group and two other companies pay nearly $1 million to settle allegations of…
Simon Willison
Datasette Agent
Datasette Agent has been officially released as an AI assistant for the Datasette platform. This tool allows users to…
Simon Willison
Quoting SpaceX S-1
SpaceX has entered into Cloud Services Agreements with Anthropic PBC to provide compute resources for AI applications.…
Simon Willison's Weblog
Google I/O, Gemini Spark, Antigravity
Google I/O has limited announcements this year, with many features still in preview. The most notable upcoming product…
Simon Willison's Weblog
llm-gemini 0.32
Release: llm-gemini 0.32 New model gemini-3.5-flash for Gemini 3.5 Flash . See also my notes on Gemini 3.5 Flash , and…
Simon Willison's Weblog
The last six months in LLMs in five minutes
The advancements in coding agents have become significant over the past six months. OpenAI and Anthropic focused on…
Simon Willison
Warelay -> OpenClaw
The OpenClaw project has undergone several name changes since its initial commit in November, evolving from Warelay to…
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