From the source
Asana used OpenAI Codex to remove the outdated testing system Enzyme from its frontend stack in about two weeks, a migration projected to take roughly five more years at its prior pace.
Model and infrastructure costs totaled about $12,000, while Asana estimates the same scope through manual engineering would have represented roughly $6 million in fully loaded effort.
The project involved up to four coding agents working in parallel from a five-sentence prompt, with an engineer checking progress twice a day and reviewing every proposed change.