Mixed
Codex running 6.1-sol explains things so much more clearly that I don't feel I need to assert a style guide on its output
PokeyCat on Hacker News
reading level metrics going down on paper
In the thread “GPT‑6 and Intelligent UI for everyone”, replying to this comment
Helped: Pointing agents at Simple English Wikipedia guidelines.
Got in the way: Claude applying STE produced appalling, hard-to-read documentation.
… I've taken a liking to pointing agents at the Simple English Wikipedia editorial guidelines...but so much of that is for making up for shortcomings of modern Anthropic models. Codex running 6.1-sol explains things so much more clearly that I don't feel I need to assert a style guide on its output.