📰 Simon Willison's Blog

In Rewriting Bun in Rust Jarred Sumner made the following claim: Claude Code v2.1.181 (released June 17th) and later use the Rust port of Bun. Startup got 10% f

Tool: Mermaid to Unicode box art (grok-mermaid) While exploring the codebase for the newly open-sourced Grok CLI coding agent I came across xai-grok-markdown/sr

I just declared a moratorium against AI-written change descriptions (e.g. PR and commit messages, also issues/tickets) from my team. AI was writing change descr

One of the most interesting tips I got from the Fireside Chat I hosted with Cat Wu and Thariq Shihipar from the Claude Code team at AIE on Wednesday was to let

Nano Banana 2 Lite Also known as Gemini 3.1 Flash Lite Image ( gemini-3.1-flash-lite-image in their API ), this is the "fastest and cheapest Gemini image model,

This morning on Hacker News I saw Moebius: 0.2B Lightweight Image Inpainting Framework with 10B-Level Performance , describing a small but effective inpainting

What happened in 2025 was this: the economics of code production were turned upside down . Instead of being very hard, time-consuming, and expensive to generate

I can 100% attest to the fact that Qwen3.6-27B is a very capable local model for coding tasks. Over the last month and a half I've been using it almost daily, e

Why AI hasn’t replaced software engineers, and won’t Arvind Narayanan and Sayash Kappor take on the question of AI job losses through the lens of a profession t

I feel a lot of things changing as working software increasingly comes out on a tap. The Jevon's paradox kicks in and I feel my own demand for software growing

I've been experimenting with different approaches to running code in a sandbox for several years now, but my latest attempt feels like it might finally have all

Release: datasette-agent-micropython 0.1a0 I want Datasette Agent to be able to generate and execute Python code safely. This alpha is looking very promising so

Tool: Pasted File Editor I really like how you can paste a large volume of text into claude.ai (or the Claude desktop/mobile apps) and it will detect it as a la

Research: pydantic-monty investigation It's been a few months since I last poked at Monty , the sandboxed subset of Python implemented in Rust. I had Claude Cod

Welcome to the Datasette blog We have a bunch of neat Datasette announcements in the pipeline so we decided it was time the project grew an official blog. I bui

Your AI coding agent, the one you use to write code, needs to reduce your maintenance costs. Not by a little bit, either. You write code twice as quick now? Bet

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

Five months in, I think I've decided that I don't want to vibecode — I want professionally managed software companies to use AI coding assistance to make more/b

An update on recent Claude Code quality reports It turns out the high volume of complaints that Claude Code was providing worse quality results over the past tw

Qwen3.6-27B: Flagship-Level Coding in a 27B Dense Model Big claims from Qwen about their latest open weight model: Qwen3.6-27B delivers flagship-level agentic c

Anthropic today quietly (as in silently , no announcement anywhere at all) updated their claude.com/pricing page (but not their Choosing a Claude plan page , wh

Tool: Cleanup Claude Code Paste Super-niche tool this. I sometimes copy prompts out of the Claude Code terminal app and they come out with a bunch of weird addi