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OpenAI builds custom Git backend in just 10 weeks to handle 2,442% code commit surge

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OpenAI builds custom Git backend in just 10 weeks to handle 2,442% code commit surge

OpenAI has developed a new Git backend called Pando to handle the growing volume of code changes generated by its engineers and Codex agents. The system now powers development across OpenAI’s monorepo, processing nearly one petabyte of Git data daily.

The infrastructure addresses a problem that emerged as Codex accelerated software development. More engineers and autonomous agents now work on separate code changes simultaneously. Their activity creates a growing stream of branch updates, code reviews, merges, and repository downloads.

OpenAI says Pando has reduced median Git push latency by nearly 80 percent. It has also improved merge reliability to 99.99 percent, compared with earlier periods when reliability sometimes dropped below 90 percent.

OpenAI’s monorepo experienced a sharp increase in development activity over the past year. Its quarterly commit growth reached 2,442 percent in Q4 2026 compared with Q1 2024.

Traditional Git infrastructure struggled to accommodate the resulting workload. Engineers encountered slower pushes and downloads, alongside failed merges. Multiple automated jobs also fetched identical commits after individual code submissions.

We built Pando, a new Git backend for our monorepo, to handle more pushes and fetches without changing how our engineers and agents use Git.

Pando cut push latency by ~80% and now serves nearly a petabyte of Git data a day. We can grow Git capacity alongside agent usage. pic.twitter.com/4c0YXOfKqK

OpenAI wanted to address these bottlenecks without replacing Git or forcing developers to adopt unfamiliar tools. Its engineers therefore designed Pando around the existing Git protocol and command-line client.

The approach preserves familiar development workflows while changing how servers coordinate updates and distribute repository data.


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