At OpenAI, that weak spot was the server behind its monorepo. In a November 2 engineering post, OpenAI's Aaron Friel, Taylor Blau, and Ted Nyman explained how Codex changed the load on the company's source control.
Each engineer now runs many tasks at once. That multiplied branches, pushes, and merges.
It also multiplied fetches and clones from laptops, research jobs, and CI, since each push can kick off several jobs that fetch the same commit. Starting around the end of 2025, the old setup couldn't keep up.
At times, reliability dropped below 90%. OpenAI's answer was a new Git backend called Pando.
It now handles all development in the monorepo. And the engineers and agents using it didn't have to change a thing.
They still run ordinary git push and git fetch commands against the same Git client. The team first asked whether they had hit a limit in Git itself or in how they served it.
The answer was the serving layer. The biggest change is how Pando handles consistency.
