OpenAI Builds Pando Backend to Keep Git Working at Monorepo Scale
OpenAI has developed Pando, an in-house Git backend for its giant code monorepo, GIGAZINE reports.
1 source 1m ago
Reporting from 1 source: GIGAZINE.
Why it matters
OpenAI chose to fix Git from underneath rather than replace it, so the tool its engineers already used stayed in place while the scaling problem moved to a backend layer, and the knowledge it fed back to the Git community appears to be the only public part of the work.
Key Facts
- OpenAI developed Pando as a backend for Git to support its large-scale monorepo.
- OpenAI's commit volume grew more than 14-fold from the first quarter of 2024 to the third quarter of 2026.
- Pando entered production operation in April 2026 and took 10 weeks from start of development, written in Rust using Codex.
- OpenAI has not open-sourced Pando but shares knowledge and bugs with the Git development community.
Commit volume grew more than 14-fold from the first quarter of 2024 to the third quarter of 2026, and push failures and merge delays had pushed reliability below 90 percent by late 2025. Pando, written in Rust by one engineer over 10 weeks, went into production in April 2026, and OpenAI says merge success now sits near 100 percent.
Pando is a backend, not a replacement. OpenAI kept its existing Git workflows and changed the layer beneath them, coordinating update order per branch instead of for the whole repository and reusing Packfiles rather than generating one per client. The company says the system now delivers 57 terabytes per hour and close to 1 petabyte per day.
The core design was handled by one engineer and implemented in Rust using Codex, reaching production in 10 weeks. Formal verification with Lean and TLA+ is run through GPT-6 Astra, with attack resistance testing by the security AI Daybreak. Pando is not open source, but OpenAI is sharing the bugs and knowledge with the Git development community.
Written with AI by Yomimono from the 1 cited source below, including Japanese-language reporting where cited. See our editorial policy.
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