Rockstar has not confirmed whether GTA 6 will run at 60 fps on the PS5 Pro. As of now, the only official performance-related statement is that the game will be available on PlayStation 5, including the PS5 Pro, and Xbox Series X|S. No frame rate or resolution targets have been announced, so any claim of 60 fps support is speculative.
Reports and community estimates suggest that the PS5 Pro may offer a performance mode, but these are not official. Rockstar has not commented on performance modes, graphical presets, or whether the game will support variable refresh rate. The platforms page lists only the consoles, and the gameplay section has no performance details. The 60 fps figure often cited in discussions is based on previous GTA titles and hardware capabilities, not on any developer statement.
For now, if you are deciding between a standard PS5 and a PS5 Pro for GTA 6, wait for official performance details closer to the release date. Rockstar typically releases technical information in the weeks before launch, including any performance modes. Until then, treat 60 fps on PS5 Pro as unconfirmed.