So you're saying that "ChatGPT-4o-latest (2025-03-26)" in LMarena is 4.1?

No, that is saying that some of the improvements that went into 4.1 have also gone into ChatGPT, including chatgpt-4o-latest (2025-03-26).

yeah I was surprised in they benchmarks during livestream they didn't compare to ChatGPT-4o (2025-03-26) but only older one.