This Week in Rails: August 28, 2026

Hi, it’s Greg . Let’s explore this week’s changes in the Rails codebase. Agents on Rails: lemans goes open source Another week, another update from Agents on Rails. This one is a big one: lemans, the harness behind every number we’ve published, is now open source. Also four new models were added: Sonnet 5, Terra, an open-weight Qwen you can run on your own machine, and one that won’t tell us its name. Actionpack ractorize This Pull Request changes the following: Make ActionDispatch::ParamBuil...