Yes
It actually seems to do well in larger code bases where it has a lot of existing structure and examples of how things are done in that code base
jillesvangurp on Hacker News
In the thread “Building more with GPT-5.1-Codex-Max”, replying to this comment
Helped: Agents.md file and existing code structure/examples.
… I think from first using codex around July to now has been quite a journey where it improved a lot. It actually seems to do well in larger code bases where it has a lot of existing structure and examples of how things are done in that code base. A lot of things it just does without me asking for them just because there's a lot of other code that does it that way. …