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

Asana used OpenAI Codex to fully remove Enzyme, an outdated testing framework, from its codebase. The work was originally estimated at five years and roughly $6M; it took two calendar weeks and $12K in model and infrastructure costs. Engineers wrote a five-sentence prompt, ran up to four coding agents in parallel, and reviewed every proposed change twice a day. Asana's CTO noted that not every multi-year project will collapse into weeks, but agents make once-impossible engineering work worth attempting.

Why it matters: Asana used Codex to rip out the Enzyme testing framework — 5 years of estimated work done in 2 weeks, cost dropped from ~$6M to $12K. The numbers carry the story. The post gives a reproducible method, not just PR fluff. Dings: it's an OpenAI official case study, so there's a m...