Yes
Since about the gpt 5 generation of models released around last summer, I'm able to work on whole git repositories with codex
jillesvangurp on Hacker News
about 85K lines of code
In the thread “Coding Agents and Use Cases”, replying to this comment
Helped: Newer models allowing whole repository context.
… I don't think that is valid anymore as of the last few model releases. Since about the gpt 5 generation of models released around last summer, I'm able to work on whole git repositories with codex. Our backend is about five years old; about 85K lines of code. …