OpenAI's best released model could be GPT-4, GPT-4o, or something else. It does not count as an OpenAI model unless it's made available to the public to try, and is known to be from OpenAI (e.g. the model can not be a secret, pseudonymous release). If arena.lmsys.org is not available at the time, the successor site or most similar leaderboard will be used.

Resolves yes if Claude 3.5 Opus is ranked above all OpenAI models 1 week after it is put on the leaderboard.