Codex is just as good if not better. And theres 3-5 other options out there just as good too (harness + model).
I suppose it truly boils down to personal taste? My take[0] on AI including harnesses.
[0]: https://a.l3x.in/ai
If you drew a venn diagram of their prospective users, the overlap ain't gonna be big. I get that they're both harnesses, but claude is clearly trying to optimize for the agentic development loop, while piagent is more about hand holding - unless you add the agentic features yourself (which is pretty easy, but again completely different target audience to cc).
They all have some annoying downsides and I use CC the most, but it's gotten to the point where I'm for sure actively shopping around for better harnesses.
I bounce between codex and cc all the time. There is no moat there.
I use the models but not the "harness" though. Not directly anyway. I am still handicapped by the CLI when running in Paseo. Both antigravity and agy are toys compared to what has been available for at least two years.
I've never heard anyone in real life discussing what model is better in some benchmark. Money talks.