I’ve used both Claude and Codex extensively, and I already preferred Codex the model. I didn’t like the harness, but recently pi got good enough to be my daily driver, and I’ve since found that it’s much better than either CC or Codex CLI. It’s OSS, very simple and hackable, and the extension system is really nice. I wouldn’t want to go back to Claude Code even if I were convinced the model were much better - given that I already preferred the alternative it’s a no-brainer. OpenAI have officially allowed the use of pi with their sub, so at least in the short term the risk of a rug pull seems minimal.

What is pi?