I don’t get these questions asking if it’s codex or Claude – I see them often. Does it matter? There are other options out there also, it feels strange to ask this. Like asking “is your car a Toyota or a BMW?“
If you ask "did you build this using Codex or Claude", it removes most of the wiggle room. And it's worded pretty neutrally, so it will often get vibe-coders who aren't technically using either of those tools to say something like, "Actually, I've built a custom harness for DeepSeek..." instead of an outright denial.
I think some users are also conscious about the longevity of their tooling related to LLM usage, too. Whether it has an effect or not, we've yet to find out.