What is the highest credit limit

Hi, interesting question! Goldman Sachs Bank, the issuer of the Apple Card, does not disclose that information. However, there have been posts on social media, Reddit and Facebook, that claim initial limits of $40,000 and limits as high as $80,000 after several Credit Limit Increases. Here are several links on how Apple Card applications are evaluated and on requesting a CLI,

https://support.apple.com/en-au/HT209218

https://support.apple.com/en-us/HT212307

I hope this helps.