Do character upgrades in gta v apply to gta online?

The provided source material does not mention any interaction between character upgrades in the single‑player mode of Grand Theft Auto V and the multiplayer mode, Grand Theft Auto Online. Because the evidence is limited to information about the Fandom website, it cannot confirm or deny a shared upgrade system between the two game modes. In the absence of specific data, it is safest to assume that character upgrades are mode‑specific and do not transfer from the story campaign to the online environment. Users looking for definitive information should consult official Rockstar Games documentation or community forums for updates on gameplay mechanics.