“At Wonderful, Codex CLI has completely replaced every other agentic harness for our core technology and architecture work requiring deep reasoning and understanding.”

“At Harvey, Codex transformed how we build by cutting early iteration time by 30–50%, freeing engineers to focus on system design and high-leverage decisions.”

“With Codex, we ship in a weekend what previously took a quarter. It’s become our go-to for projects we wouldn’t have otherwise been able to take on.”

“The recent Codex releases have been a step change. Codex PR reviews catch bugs our team would have missed, and we ship with more confidence because of it. Now we’re pulling the CLI and desktop app into more of our workflows—each release raises the bar.”

“Codex performed best in our backend Python code-review benchmark. It was the only one to catch tricky backward compatibility issues and consistently found the hard bugs that other bots missed.”

“I needed to update another team’s codebase for a release. Codex handled the refactor and test generation, delivering fully tested code I handed back fast—keeping the feature on schedule without added risk.”