Simon Willison releases web-edit for browser-based file editing

A new web app for editing files

Simon Willison has released web-edit 0.1a1, a web app for editing the files in a folder from the browser ¹. The version number marks it as an early alpha: software at its first public stage, which may still have bugs or missing features.

AI helped make it faster

The release includes performance optimizations written by Claude Opus 5.5, the large language model from Anthropic ¹. Willison gave the model a Python 3.15 profiling report, a file that shows where a program spends its time, and that report had itself been generated by GPT-6 Astra, another AI model . One AI produced the measurements and another used them to make the code faster.

What comes next

Willison's announcement is two lines long and says nothing more about plans, features or who the tool is for. As an alpha, it is aimed at people willing to try early software.

Correcciones y actualizaciones

• Corrected on 20 October 2026. An earlier version of this story included things that were not in Willison's announcement but on the page around it: a paid monthly briefing he offers, his other recent posts (on moving his projects to Python 3.15 and on a voice-built blog feature), and the claim that web-edit itself runs on Python 3.15, when the announcement only says the profiling report came from Python 3.15. It also called the project open source and listed an unrelated encyclopedia page as a source. They have been removed.

Los datos clave

• web-edit 0.1a1 is a web app for editing files in a folder from the browser, in early alpha
• Its performance optimizations were written by Claude Opus 5.5
• Claude worked from a Python 3.15 profiling report generated by GPT-6 Astra
• Simon Willison announced the release on October 13, 2026

Fuentes

1. Release: web-edit 0.1a1