Asana cleared 5 years of engineering work in 2 weeks with Codex

Asana used OpenAI Codex (an AI model that writes code) to remove Enzyme, an outdated testing system, in just two weeks instead of the five years previously planned. Multiple AI agents worked in parallel on the codebase while engineers reviewed each proposed change, completing the project for about $12,000 in model costs compared to a $6 million estimate using traditional staffing.