When Apple's Chief Executive Officer Tim Cook and his top deputies this week unveiled a landmark arrangement with OpenAI to integrate ChatGPT into the iPhone, iPad and Mac, they were mum on the financial terms.

A question left unanswered on Monday: Which company is paying the other as part of a tight collaboration that has potentially lasting monetary benefits for both.

But, according to people briefed on the matter, the partnership isn’t expected to generate meaningful revenue for either party — at least, not at the outset.