AI
OpenAI acquires Git AI founders to boost Codex performance tracking
The AI coding platform recruits the creators of an open-source tool that measures how much code is generated by AI agents and whether they deliver business value.
The New Stack
OpenAI has brought on board Aidan Cunniffe and Sasha Varlamov, the co-founders of Git AI, to strengthen its efforts around measuring the real-world impact of its Codex coding assistant. The pair will join OpenAI's Codex team, where they'll help enterprises track how their AI-powered coding investments translate into measurable returns.
What Git AI does#
Git AI is an open-source Git extension built to create visibility around machine-generated code. The tool tags every line written by an AI agent with metadata about which model, agent, and prompt produced it—information that persists even after code is committed, merged, or rebased. This enables development teams to understand what percentage of their AI-generated code actually ships to production, how much gets reworked, and which models and agents consume the most resources relative to their output quality.
The platform already supports a range of AI coding partners, including Codex, Anthropic's Claude Code, Cursor, and Google's Gemini CLI, among others. Developers can continue their normal workflows; supported agents automatically feed their changes to Git AI in the background.
Why OpenAI is interested#
OpenAI's stated goal is to help companies "see where Codex is making a difference," according to Thibault Sottiaux, a member of OpenAI's technical staff overseeing ChatGPT and Codex. Cunniffe emphasized that both parties share a conviction that engineering teams need transparent data to benchmark AI tool performance and understand the true cost-benefit of their token spending.
Cunniffe's track record#
This is not Cunniffe's first successful founder exit. He previously launched Optic in 2018, an open-source API tooling company that Atlassian acquired in 2024. After the deal, he became a principal product manager at Atlassian focused on developer tools. Git AI began as a side project during his tenure there in mid-2025, addressing a straightforward but crucial question: how much code was actually being written by AI, and what ultimately happened to it? By November 2025, it had grown substantial enough that Cunniffe departed Atlassian to spin it out as a standalone venture.
