Responsibilities to Employers: Proprietary Models

John is a senior analyst at a prestigious investment firm. He has recently developed a proprietary financial model that significantly enhances the firm's ability to analyze potential investment opportunities. However, he was approached by a competitor firm offering him a lucrative position where they would allow him to use his model to improve their analysis capabilities.

Considering his responsibilities to his current employer, John is pondering whether he may accept this offer. He is well aware of the ethical standards outlined by the CFA Institute, particularly regarding the obligations financial professionals have to their employers. John is unsure how to appropriately balance his professional aspirations with his duty to his current employer.

What should John do to adhere to his responsibilities under the CFA Institute's professional standards?