I'm more surprised that OpenAI is extremely subsidising their ChatGPT subscriptions. With Plus you can do a lot more than with Calude's x5 Max. Is it an expense they just can afford, while people have not migrated over from CC?
Just trying to win over market share I assume. OpenAI is willing to subsidize to try to get people to switch from CC to Codex, and the best incentive is to offer more tokens at a lower price.