Scaling Git at OpenAI
OpenAI, Monday, November 2nd, 2026
OpenAI built Pando, a Git-compatible backend for its monorepo that scales concurrent pushes and fetches driven by Codex and agents.
Codex-driven parallel work flooded OpenAI's monorepo with branches, pushes, merges and CI fetches, and by late last year reliability at times fell below 90%.
OpenAI built Pando, a new backend that keeps full compatibility with the Git protocol and client so engineers and agents did not change their workflows.
Pando stores each pushed packfile as an immutable blob, records ref versions in a horizontally scalable metadata store, and serializes updates per branch rather than across the whole repository, reusing packfiles to speed reads.
It now powers all monorepo development, cut median push latency by nearly 5x and serves almost a petabyte of Git data a day, and OpenAI is contributing related improvements to upstream Git.