What content from gta v story mode is exclusive to single player?

The Wikipedia article on the development of Grand Theft Auto V focuses on the game's creation process, team size, and release history across different platforms. While it mentions the game's story mode as part of the broader Grand Theft Auto series, it does not detail specific features or content exclusive to the single-player experience. Without explicit information in the provided source, I cannot identify unique elements like missions, characters, or activities that are only available in story mode versus GTA Online. The evidence lacks the necessary details to answer this question accurately.